@article {5024, title = {Microbial mat activity and soil biogeochemistry across variable phosphorus availability in Taylor Valley, Antarctica}, journal = {Antarctic Science}, year = {2025}, month = {05/2025}, abstract = {

Primary production is fundamental to ecosystems, and in many extreme environments production is facilitated by microbial mats. Microbial mats are complex assemblages of photo- and heterotrophic microorganisms colonizing sediment and soil surfaces. These communities are the dominant producers of the McMurdo Dry Valleys, Antarctica, where they occupy lentic and lotic environments as well as intermittently wet soils. While the influence of microbial mats on stream nutrient dynamics and lake organic matter cycling is well documented, the influence of microbial mats on underlying soil is less well understood, particularly the effects of microbial mat nitrogen and carbon fixation. Taylor Valley soils occur across variable levels of inorganic phosphorus availability, with the Ross Sea drift containing four times that of the Taylor drifts, providing opportunities to examine how soil geochemistry influences microbial mats and the ecological functions they regulate. We found that inorganic phosphorus availability is positively correlated with microbial mat biomass, pigment concentration and nitrogen fixation potential. Additionally, our results demonstrate that dense microbial mats influence the ecological functioning of underlying soils by enriching organic carbon and total nitrogen stocks (two times higher). This work contributes to ongoing questions regarding the sources of energy fuelling soil food webs and the regional carbon balance in the McMurdo Dry Valleys.

}, keywords = {LTER-MCM, carbon, cyanobacteria, nitrogen fixation, phosphorus, pigments, soil ecology}, issn = {0954-1020}, doi = {10.1017/S0954102025000094}, url = {https://www.cambridge.org/core/journals/antarctic-science/article/microbial-mat-activity-and-soil-biogeochemistry-across-variable-phosphorus-availability-in-taylor-valley-antarctica/0655E2F09B8D6961618B8F396BA692F2}, author = {Power, Sarah N. and Osburn, Ernest D. and John E. Barrett} } @article {5015, title = {Morphology and distribution of bubble-supported microbial mats from ice-covered Antarctic lakes}, journal = {Journal of Geophysical Research: Biogeosciences}, volume = {130}, year = {2025}, month = {03/2025}, abstract = {

Gas bubbles directly influence the macromorphology of benthic microbial mats resulting in preservable biosedimentary structures. This study characterizes the morphology and distribution of microbial mats growing in gas-supersaturated, perennially ice-covered lakes Fryxell, Joyce, and Hoare of the McMurdo Dry Valleys of Antarctica. Photosynthetic benthic mats within the gas-supersaturated zone trap oxygen-rich bubbles and become buoyant, tearing off the bottom as \“liftoff mats.\” These liftoff mats form a succession of morphologies starting with bubble-induced deformation of flat mats into tent, ridge, and finger liftoff mat. With progressive deformation, mats tear, forming sheet liftoff, while multiple cycles of deformation and tearing transform sheet into strip liftoff. Some mats detach from the substrate and float to the underside of the ice. The depth range of the liftoff zone has varied over time at each lake. Downslope expansion of bubble formation brings previously bubble-free, deep-water pinnacle mats into the liftoff zone. When the liftoff zone shallows, liftoff mats at the deeper end deflate and can become scaffolding for additional mat growth. The superposition and relative orientation of liftoff and pinnacle mats can be used to track the maximum depth of the liftoff zone and changes in gas saturation state in these lakes through time. Our results demonstrate that gas bubbles, even when they are transitory, can exert a significant impact on the morphology of microbial mats at larger scales. This provides a way to identify similar structures and gas supersaturated environments in the biosedimentary record.

}, keywords = {LTER-MCM, Antarctica, biosediments, bubble-driven morphology, gas-supersaturation, ice-covered lakes, microbial mats}, issn = {2169-8953}, doi = {10.1029/2024JG008516}, url = {https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JG008516}, author = {Juarez-Rivera, M. and Mackey, Tyler J. and Ian Hawes and Sumner, Dawn Y.} } @article {4940, title = {McMurdo Dry Valley lake edge {\textquoteleft}moats{\textquoteright}: The ecological intersection between terrestrial and aquatic polar desert habitat}, journal = {Antarctic Science}, year = {2024}, month = {04/2024}, pages = {1 - 17}, abstract = {

Aquatic ecosystems - lakes, ponds and streams - are hotspots of biodiversity in the cold and arid environment of Continental Antarctica. Environmental change is expected to increasingly alter Antarctic aquatic ecosystems and modify the physical characteristics and interactions within the habitats that they support. Here, we describe physical and biological features of the peripheral \‘moat\’ of a closed-basin Antarctic lake. These moats mediate connectivity amongst streams, lake and soils. We highlight the cyclical moat transition from a frozen winter state to an active open-water summer system, through refreeze as winter returns. Summer melting begins at the lakebed, initially creating an ice-constrained lens of liquid water in November, which swiftly progresses upwards, creating open water in December. Conversely, freezing progresses slowly from the water surface downwards, with water at 1 m bottom depth remaining liquid until May. Moats support productive, diverse benthic communities that are taxonomically distinct from those under the adjacent permanent lake ice. We show how ion ratios suggest that summer exchange occurs amongst moats, streams, soils and sub-ice lake water, perhaps facilitated by within-moat density-driven convection. Moats occupy a small but dynamic area of lake habitat, are disproportionately affected by recent lake-level rises and may thus be particularly vulnerable to hydrological change.

}, keywords = {LTER-MCM, connectivity, ecosystem, ice, microbial mats, transition}, issn = {0954-1020}, doi = {10.1017/S0954102024000087}, url = {https://www.cambridge.org/core/journals/antarctic-science/article/mcmurdo-dry-valley-lake-edge-moats-the-ecological-intersection-between-terrestrial-and-aquatic-polar-desert-habitats/31D94DD51E651603482A3AE6E8A52A57}, author = {Stone, Michael S. and Devlin, Shawn and Ian Hawes and Kathleen A. Welch and Michael N. Gooseff and Cristina D. Takacs-Vesbach and Rachael M. Morgan-Kiss and Byron Adams and John E. Barrett and John C. Priscu and Peter T. Doran} } @article {5002, title = {Measuring and modelling functional moat area in perennially ice-covered Lake Fryxell, Antarctica}, journal = {Arctic, Antarctic, and Alpine Research}, volume = {56}, year = {2024}, month = {10/2024}, abstract = {

The perennially ice-covered lakes of the McMurdo Dry Valleys (MDVs), Antarctica, are an important reservoir of liquid water in an arid and largely frozen environment. During the austral summer, the margins of these ice covers melt, forming a \“moat\” of liquid water and thin ice, allowing exchange between lake waters and the atmosphere to occur and serving as an interface between lake, soil, and stream ecosystems. The size of these moats varies from year to year. Here, we have established the first published record of moat area changes at MDVs\’ Lake Fryxell through time using manual traces of the moat as observed via satellite imagery. We have also tested a semi-automated approach for measuring moat area and found that it consistently underestimated the manual record, which we suspect may be due to the lower spatial resolution of images used in this versus the manual approach. Finally, we developed a predictive model based on readily available climate data, allowing moat area to be predicted beyond the limits of the satellite-based records. We found that functional moat area varies annually, potentially influencing ecosystem processes in the moats.

}, keywords = {LTER-MCM, Lake Fryxell, lake ice, McMurdo Dry Valleys, moat, NDWI, predictive model}, issn = {1523-0430}, doi = {10.1080/15230430.2024.2406626}, url = {https://www.tandfonline.com/doi/full/10.1080/15230430.2024.2406626}, author = {Stone, Michael S. and Salvatore, Mark R. and Hilary A. Dugan and Myers, Madeline and Peter T. Doran} } @phdthesis {5018, title = {Metagenomic analysis of Antarctic microbial communities}, volume = {Ph.D.}, year = {2024}, month = {06/2024}, pages = {136}, school = {University of New Mexico}, type = {doctoral}, address = {Albuquerque, NM, USA}, abstract = {

The research presented in this dissertation focuses on microbial roles in biogeochemical cycling in Antarctic aquatic environments. The major objective of my research was to examine the impact of biotic and abiotic pressures on nutrient cycling in microbially dominated systems. I used three perennially ice covered lakes in the McMurdo Dry Valleys (MDVs) along with subglacial lakes Whillans and Mercer as natural case studies. The MDVs are located in Victoria Land, East Antarctica and have been studied since 1993 as part of the McMurdo Long Term Ecological Research Project. Viruses in the MDVs were shown to be seasonally abundant and have high infection rates. My work built upon this previous research by showing that viruses are also diverse and potentially re-direct host metabolism through auxiliary metabolic genes (AMGs). Subglacial lake Whillans and Mercer lie underneath 800 and 1100 meters of ice respectively beneath the West Antarctic Ice Sheet. Previous studies in subglacial lakes Whillans have shown an active prokaryotic community. Through viral-like particle counts, microscopy, and metagenomics, we established the presence and potential metabolic influence of viruses in both Whillans and Mercer. In MDV lakes have an extensive high-throughput DNA dataset studying microbial communities through the 16S rRNA gene. We used metagenomic sequencing within two MCM lakes at multiple depths to build upon these previous datasets by annotating metagenomically assembled genomes for functional characteristics. This project highlights the lakes\&$\#$39; vertical redox gradient, showing that dominant taxa, nutrient cycling genes, and metabolic potentials change down the water column. The MDVs serve as a biological indicator for climate change in continental Antarctica and functional changes serve as important indicators of climate change. Taken together, this dissertation shows the importance of multi-kingdom microbial function under oligotrophic conditions.

}, keywords = {LTER-MCM, bacteria, biogeochemical cycling, function, metagenomics, virus}, url = {https://www.proquest.com/docview/3119910585}, author = {Robinson, David M.}, editor = {Cristina D. Takacs-Vesbach} } @article {4865, title = {MacroSheds: A synthesis of long-term biogeochemical, hydroclimatic, and geospatial data from small watershed ecosystem studies}, journal = {Limnology and Oceanography Letters}, volume = {8}, year = {2023}, month = {06/2023}, pages = {419 - 452}, abstract = {

The US Federal Government supports hundreds of watershed monitoring efforts from which solute fluxes can be calculated. Although instrumentation and methods vary between studies, the data collected and their motivating questions are remarkably similar. Nevertheless, little effort toward their compilation has previously been made. The MacroSheds project has developed a future-friendly system for harmonizing daily time series of streamflow, precipitation, and solute chemistry from 169+ watersheds, and supplementing each with watershed attributes. Here, we describe the breadth of MacroSheds data, and detail the steps involved in rendering each data product. We provide recommendations for usage and discuss when other datasets might be more suitable. The MacroSheds dataset is an unprecedented resource for watershed science, and for hydrology, as a small-watershed supplement to existing collections of streamflow predictors, like CAMELS and GAGES-II. The MacroSheds platform includes a web dashboard for visualization and an R package for data access and analysis.

}, keywords = {LTER-MCM}, issn = {2378-2242}, doi = {10.1002/lol2.v8.310.1002/lol2.10325}, url = {https://aslopubs.onlinelibrary.wiley.com/doi/full/10.1002/lol2.10325}, author = {Vlah, Michael J. and Rhea, Spencer and Bernhardt, Emily S. and Slaughter, Weston and Gubbins, Nick and DelVecchia, Amanda G. and Thellman, Audrey and Ross, Matthew R. V.} } @article {4925, title = {Meteorological drivers of melt at two nearby glaciers in the McMurdo Dry Valleys of Antarctica}, journal = {Journal of Glaciology}, year = {2023}, month = {12/2023}, pages = {1 - 13}, abstract = {

We study the meteorological drivers of melt at two glaciers in Taylor Valley, Antarctica, using 22 years of weather station observations and surface energy fluxes. The glaciers are located only 30 km apart, but have different local climates; Taylor Glacier is generally drier and windier than Commonwealth Glacier, which receives more snowfall due to its proximity to the coast. Commonwealth Glacier shows more inter-annual melt variability, explained by variable albedo due to summer snowfall events. A significant increase in surface melt at Commonwealth Glacier is associated with a decrease in summer minimum albedo. Inter-annual variability in melt at both glaciers is linked to degree-days above freezing during f{\"o}hn events, occurring more frequently at Taylor Glacier. At Taylor Glacier melt occurs most often with positive air temperatures, but f{\"o}hn conditions also favour sublimation, which cools the surface and prevents melt for the majority of the positive air temperatures. At Commonwealth Glacier, most of the melt instead occurs with sub-zero air temperatures, driven by strong solar radiative heating. Future melt at Taylor Glacier will likely be more sensitive to changes in f{\"o}hn events, while Commonwealth Glacier will be impacted more by changes in near coastal weather, where moisture inputs can drive cloud cover, snowfall and change albedo.

}, keywords = {LTER-MCM, Antarctic glaciology, energy balance, glacier meteorology, ice/atmosphere interactions, melt-surface}, issn = {0022-1430}, doi = {10.1017/jog.2023.98}, url = {https://www.cambridge.org/core/journals/journal-of-glaciology/article/meteorological-drivers-of-melt-at-two-nearby-glaciers-in-the-mcmurdo-dry-valleys-of-antarctica/2B8ED17DEC26AB5F0905BC4C7ACA02FA}, author = {Hofsteenge, Marte G. and Cullen, Nicolas J. and Conway, Jonathan P. and Reijmer, Carleen H. and van den Broeke, Michiel R. and Katurji, Marwan} } @phdthesis {4862, title = {Microbial life in challenging environments}, volume = {Ph.D.}, year = {2023}, school = {University of Colorado Boulder}, type = {doctoral}, address = {Boulder, CO}, abstract = {

Microorganisms are nearly ubiquitous on Earth, but the identity and function of microbial communities are inherently dependent on the properties of the specific environment in question. Here, I have studied soils around the world to answer questions about how the functional attributes of microorganisms allow them to respond to challenging environmental conditions. First, I explore how microbial communities in soils change across environmental gradients in Antarctica. I show that microbes in Antarctic surface soils are most restricted by low temperatures, low water availability, and high concentrations of salt. Microbial communities near the polar plateau, the most challenging environment, are dominated by Actinobacteria and Chloroflexi, and are enriched in genes associated with the oxidation of hydrogen gas as an energy source. Second, I show that the earliest microbial colonizers of a newly-formed volcanic island in the Kingdom of Tonga are chemolithotrophs that appear to have come from nearby geothermal systems. While many of these microbes utilize sulfur as an energy source, the most abundant organisms have genes that indicate they can oxidize trace gases including carbon monoxide and hydrogen. Finally, I show that organisms associated with carbon limited subsurface soils tend to have smaller genomes, grow more slowly, and have more gene pathways associated with metabolism and the storage of carbon. Taken together, these studies shed light on microbial survival in challenging soil environments and show the varied ways in which microbial communities interact with and are affected by their surroundings.

}, keywords = {LTER-MCM, Antarctica, environmental conditions, microbial ecology, microorganisms, soils, tonga}, url = {https://www.proquest.com/docview/2814734209}, author = {Dragone, Nicholas B.}, editor = {Noah Fierer} } @article {4732, title = {The magnitude and climate sensitivity of isotopic fractionation from ablation of Antarctic Dry Valley lakes}, journal = {Arctic, Antarctic, and Alpine Research}, volume = {53}, year = {2021}, month = {12/2021}, pages = {352 - 371}, abstract = {

There has been extensive research on the effects of evaporation on the isotopic ratio of lacustrine and marine water bodies; however, there are limited data on how ablation or sublimation from lake or sea ice influences the isotopic ratio of the residual water body. This is a challenging problem because there remains uncertainty on the magnitude of fractionation during sublimation and because ablation can involve mixed-phase processes associated with simultaneous sublimation, melting, evaporation, and refreezing. This uncertainty limits the ability to draw quantitative inferences on changing hydrological budgets from stable isotope records in arctic, Antarctic, and alpine lakes. Here, we use in situ measurements of the isotopic ratio of water vapor along with the gradient diffusion method to constrain the isotopic ratio of the ablating ice from two lakes in the McMurdo Dry Valleys, Antarctica. We find that during austral summer, the isotopic fractionation of ablation was insignificant during periods of boundary layer instability that are typical during midday when latent heat is highest. This implies that the loss of mass during these periods did not yield any isotopic enrichment to the residual lake mass. However, fractionation increased after midday when the boundary layer stabilized and the latent heat flux was small. This diurnal pattern was mirrored on synoptic timescales, when following warm and stable conditions latent heat flux was low and dominated by higher fractionation for a few days. We hypothesize that the shifting from negligible to large isotopic fractionation reflects the development and subsequent exhaustion of liquid water on the surface. The results illustrate the complex and nonlinear controls on isotopic fractionation from icy lakes, which implies that the isotopic enrichment from ablation could vary significantly over timescales relevant for changing lake volumes. Future work using water isotope fluxes for longer periods of time and over additional perennial and seasonal ice-covered lake systems is critical for developing models of the isotopic mass balance of arctic and Antarctic lake systems.

}, keywords = {LTER-MCM, Dry Valley lakes, isotope fractionation, stable water isotopes}, issn = {1523-0430}, doi = {10.1080/15230430.2021.2001899}, url = {https://www.tandfonline.com/doi/full/10.1080/15230430.2021.2001899}, author = {Bellagamba, Anthony W. and Berkelhammer, Max and Winslow, Luke A. and Peter T. Doran and Myers, Krista F. and Devlin, Shawn and Ian Hawes} } @book {4946, title = {The McMurdo Dry Valleys of Antarctica: A geological, environmental, and ecological analog to the Martian surface and near surface}, year = {2021}, publisher = {Elsevier}, organization = {Elsevier}, abstract = {

The surface of Mars is universally thought to have experienced widespread cold and dry environmental conditions for at least the last half of its geologic history, with more modern studies suggesting relatively cold and dry conditions early in its geologic history as well. However, the paucity of liquid water and mean annual temperatures well below the freezing point of water do not necessarily mean a complete cessation of all water-related geologic activity at the Martian surface. Over the past several decades, investigations in the McMurdo Dry Valleys (MDV) of Antarctica have revealed a dynamic geological, environmental, and ecological system resulting from locally optimized conditions operating over repeated, albeit brief, intervals during summer months. In this chapter, we compare the hyper-arid and hypo-thermal environments of the MDV and the modern Martian surface and discuss three unique enigmas that demonstrate how the Antarctic is a valuable analog to better understand processes on Mars.

}, keywords = {LTER-MCM, Antarctica, astrobiology, climate, geology, geomorphology, Mars}, isbn = {9780128202456}, doi = {10.1016/B978-0-12-820245-6.00011-2}, url = {https://www.sciencedirect.com/science/article/pii/B9780128202456000112}, author = {Salvatore, Mark R. and Joseph S. Levy} } @article {4690, title = {Meta-analysis of Cryogenian through modern quartz microtextures reveals sediment transport histories}, journal = {Journal of Sedimentary Research}, volume = {91}, year = {2021}, month = {09/2021}, pages = {929-944}, abstract = {

Quantitative analysis of quartz microtextures by means of scanning electron microscopy (SEM) can reveal the transport histories of modern and ancient sediments. However, because workers identify and count microtextures differently, it is difficult to directly compare quantitative microtextural data analyzed by different workers. As a result, the defining microtextures of certain transport modes and their probabilities of occurrence are not well constrained. We used principal-component analysis (PCA) to directly compare modern and ancient aeolian, fluvial, and glacial samples from the literature with nine new samples from active aeolian and glacial environments. Our results demonstrate that PCA can group microtextural samples by transport mode and differentiate between aeolian transport and fluvial and glacial transport across studies. The PCA ordination indicates that aeolian samples are distinct from fluvial and glacial samples, which are in turn difficult to disambiguate from each other. Ancient and modern sediments are also shown to have quantitatively similar microtextural relationships. Therefore, PCA may be a useful tool to constrain the ambiguous transport histories of some ancient sediment grains. As a case study, we analyzed two samples with ambiguous transport histories from the Cryogenian Br{\r a}vika Member (Svalbard). Integrating PCA with field observations, we find evidence that the Br{\r a}vika Member facies investigated here includes aeolian deposition and may be analogous to syn-glacial Marinoan aeolian units including the Bakoye Formation in Mali and the Whyalla Sandstone in South Australia.

}, keywords = {LTER-MCM}, issn = {1527-1404}, doi = {10.2110/jsr.2020.151}, url = {https://pubs.geoscienceworld.org/jsedres/article/91/9/929/607764/Meta-analysis-of-Cryogenian-through-modern-quartz}, author = {Reahl, Jocelyn N. and Cantine, Marjorie D. and Wilcots, Julia and Mackey, Tyler J. and Bergmann, Kristin D.} } @article {4597, title = {Metabolic capacity of the Antarctic cyanobacterium Phormidium pseudopriestleyi that sustains oxygenic photosynthesis in the presence of hydrogen sulfide}, journal = {Genes}, volume = {12}, year = {2021}, month = {03/2021}, pages = {426}, abstract = {

Sulfide inhibits oxygenic photosynthesis by blocking electron transfer between H2O and the oxygen-evolving complex in the D1 protein of Photosystem II. The ability of cyanobacteria to counter this effect has implications for understanding the productivity of benthic microbial mats in sulfidic environments throughout Earth history. In Lake Fryxell, Antarctica, the benthic, filamentous cyanobacterium Phormidium pseudopriestleyi creates a 1\–2 mm thick layer of 50 \µmol L\−1 O2 in otherwise sulfidic water, demonstrating that it sustains oxygenic photosynthesis in the presence of sulfide. A metagenome-assembled genome of P. pseudopriestleyi indicates a genetic capacity for oxygenic photosynthesis, including multiple copies of psbA (encoding the D1 protein of Photosystem II), and anoxygenic photosynthesis with a copy of sqr (encoding the sulfide quinone reductase protein that oxidizes sulfide). The genomic content of P. pseudopriestleyi is consistent with sulfide tolerance mechanisms including increasing psbA expression or directly oxidizing sulfide with sulfide quinone reductase. However, the ability of the organism to reduce Photosystem I via sulfide quinone reductase while Photosystem II is sulfide-inhibited, thereby performing anoxygenic photosynthesis in the presence of sulfide, has yet to be demonstrated.\ 

}, keywords = {LTER-MCM}, doi = {10.3390/genes12030426}, url = {https://www.mdpi.com/2073-4425/12/3/426}, author = {Lumian, Jessica E. and Jungblut, Anne D. and Dillon, Megan L. and Hawes, Ian and Peter T. Doran and Mackey, Tyler J. and Dick, Gregory J. and Grettenberger, Christen L. and Sumner, Dawn Y.} } @article {4297, title = {Methane production in the oxygenated water column of a perennially ice-covered Antarctic lake}, journal = {Limnology and Oceanography}, volume = {65}, year = {2020}, month = {01/2020}, abstract = {

Aerobic methane production in aquatic ecosystems impacts the global atmospheric budget of methane, but the extent, mechanism, and taxa responsible for producing this greenhouse gas are not fully understood. Lake Bonney (LB), a perennially ice-covered Antarctic lake, has cold hypersaline waters underlying an oxygenated freshwater layer. We present temporal methane concentration profiles in LB indicating methane production in the oxygenated (\>\ 200\% air saturation) water. Experiments amended with methylphosphonate (MPn) yielded methane generation, suggesting in situ methanogenesis via the carbon-phosphorus (C-P) lyase pathway. Enrichment cultures from the lake were used to isolate five bacterial strains capable of generating methane when supplied with MPn as the sole P source. Based on 16S rRNA gene sequencing, the isolates belong to the Proteobacteria (closely related to Marinomonas, Hoeflea, and Marinobacter genera) and Bacteroidetes (Algoriphagus genus). 16S rRNA metagenomic sequencing confirms the presence of these taxa in LB. None of the isolated species were reported to be capable to produce methane. In addition, orthologs of the phosphoenolpyruvate mutase gene (PepM) and methylphosphonate synthase (MPnS), enzymes involved in phosphonate and MPn biosynthesis, were widely spread in the LB shotgun metagenomic libraries; genes related to C-P lyase pathways (phn gene clusters) were also abundant. 16S rRNA and mcrA genes of anaerobic methanogens were absent in both 16S rRNA and metagenomics libraries. These data reveal that in situ aerobic biological methane production is likely a significant source of methane in LB.

}, keywords = {LTER-MCM}, doi = {10.1002/lno.11257}, url = {https://aslopubs.onlinelibrary.wiley.com/doi/full/10.1002/lno.11257}, author = {Li, Wei and John E. Dore and Steigmeyer, August J. and Cho, Yong-Joon and Kim, Ok-Sun and Liu, Yongqin and Rachael M. Morgan-Kiss and Skidmore, Mark L. and John C. Priscu} } @article {4447, title = {Modeling present and future ice covers in two Antarctic lakes}, journal = {Journal of Glaciology}, volume = {66}, year = {2020}, month = {02/2020}, abstract = {

Antarctic lakes with perennial ice covers provide the opportunity to investigate in-lake processes without direct atmospheric interaction, and to study their ice-cover sensitivity to climate condi- tions. In this study, a numerical model \– driven by radiative, atmospheric and turbulent heat fluxes from the water body beneath the ice cover \– was implemented to investigate the impact of climate change on the ice covers from two Antarctic lakes: west lobe of Lake Bonney (WLB) and Crooked Lake. Model results agreed well with measured ice thicknesses of both lakes (WLB \– RMSE= 0.11 m over 16 years of data; Crooked Lake \– RMSE= 0.07 m over 1 year of data), and had acceptable results with measured ablation data at WLB (RMSE= 0.28 m over 6 years). The differences between measured and modeled ablation occurred because the model does not consider interannual variability of the ice optical properties and seasonal changes of the lake\’s thermal structure. Results indicate that projected summer air temperatures will increase the ice-cover annual melting in WLB by 2050, but that the ice cover will remain peren- nial through the end of this century. Contrarily, at Crooked Lake the ice cover becomes ephem- eral most likely due to the increase in air temperatures.

}, keywords = {LTER-MCM, climate change, energy balance, ice and climate, ice-sheet modeling, lake ice}, doi = {10.1017/jog.2019.78}, url = {https://www.cambridge.org/core/journals/journal-of-glaciology/article/modeling-present-and-future-ice-covers-in-two-antarctic-lakes/9306439ADD5492BC05F3BAF0E076B1C3}, author = {Echeverr{\'\i}a, Sebasti{\'a}n and Hausner, Mark B. and Bambach, Nicol{\'a}s and Vicu{\~n}a, Sebasti{\'a}n and Su{\'a}rez, Francisco} } @article {4837, title = {Meteorological connectivity from regions of high biodiversity within the McMurdo Dry Valleys of Antarctica}, journal = {Journal of Applied Meteorology and Climatology}, volume = {58}, year = {2019}, month = {11/2019}, pages = {2437 - 2452}, abstract = {

Meteorological connectivity between biological hot spots of the McMurdo Dry Valleys (MDVs) of Antarctica is thought to play a role in species distribution and abundance through the aeolian transport of bioaerosols. Understanding the potential role of such meteorological connectivity requires an understanding of near-surface wind flow within and between valley airsheds. To address this, we applied Lagrangian wind trajectory modeling to mesoscale (spatial resolution of ~1 km) weather model output to predict connectivity pathways, focusing on regions of high biodiversity. Our models produce maps of a likelihood metric of wind connectivity that demonstrate the synoptic and mesoscale dependence of connections between local, near-local, and nonlocal areas on wind transport, modulated by synoptic weather and topographic forcing. These connectivity areas can have spatial trends modulated by the synoptic weather patterns and locally induced topographically forced winds. This method is transferrable to other regions of Antarctica for broader terrestrial, coastal, and offshore ecological connectivity research. Also, our analysis and methods can inform better placement of aeolian dust and bioaerosol samplers in the McMurdo Dry Valleys, provide preliminary guidelines behind the meteorological controls of sediment transport and smaller particle distribution, and present quantifiable knowledge informing new hypotheses around the potential of wind acting as a physical driver for biological connectivity in the MDVs.

}, keywords = {LTER-MCM, Antarctica, atmosphere, biosphere-atmosphere interaction, mesoscale models, mesoscale processes, numerical analysis/modeling}, issn = {1558-8424}, doi = {10.1175/JAMC-D-18-0336.1}, url = {https://journals.ametsoc.org/view/journals/apme/58/11/jamc-d-18-0336.1.xml}, author = {Katurji, Marwan and Khan, Basit and Sprenger, Michael A. and Datta, Rajasweta and Joy, Kurt and Zawar-Reza, Peyman and Ian Hawes} } @mastersthesis {4441, title = {Microbial and CO2 responses to water stresses show decreased productivity and diversity through time}, volume = {M.S.}, year = {2018}, month = {05/2018}, school = {Brigham Young University}, type = {masters}, address = {Provo, UT}, abstract = {

Some bacterial taxa when stimulated by water additions will break dormancy, grow, and become dominant members of the community and contribute significant pulses of\ CO2 associated with the rewetting event. These pulses of activity are associated with high levels of bacterial productivity in soils. (Aanderud et al. 2011) We examined the bacterial taxa that resuscitate and become metabolically active following two forms of water stress (soil drying- rewetting and freeze-thaw cycles) and we captured and measured the CO2 emanating from those soils. Specifically, We used target metagenomics, which uses a specific gene pool within bacteria that is associated with a function of an ecological process, in this case active (16S rRNA communities) bacteria and all bacteria (16S rRNA communities) during drying-rewetting and freeze-thaw cycles. We measured an array of community dynamics (i.e., evenness, richness, diversity, relative abundance of taxa, and network analyses between taxa) as dry soils are rewetted and as frozen soils thaw multiple times in three cold desert soils. Soils from all three locations exhibited some similar bacterial taxa and gene function but were large in part their own community derived from the evolutionary history of the continent in which they reside.

}, keywords = {LTER-MCM, dormancy, PiCRUST, turnover}, url = {https://scholarsarchive.byu.edu/etd/6830}, author = {Robinson, David M. and Aanderud, Zachary T.} } @article {4114, title = {Multiple ice-binding proteins of probable prokaryotic origin in an Antarctic lake alga, Chlamydomonas sp. ICE-MDV (Chlorophyceae)}, journal = {Journal of Phycology}, volume = {53}, year = {2017}, month = {08/2017}, chapter = {848}, abstract = {

Ice-associated algae produce ice-binding proteins (IBPs) to prevent freezing damage. The IBPs of the three chlorophytes that have been examined so far share little similarity across species, making it likely that they were acquired by horizontal gene transfer (HGT). To clarify the importance and source of IBPs in chlorophytes, we sequenced the IBP genes of another Antarctic chlorophyte, Chlamydomonas sp. ICE-MDV (Chlamy-ICE). Genomic DNA and total RNA were sequenced and screened for known ice-associated genes. Chlamy-ICE has as many as 50 IBP isoforms, indicating that they have an important role in survival. The IBPs are of the DUF3494 type and have similar exon structures. The DUF3494 sequences are much more closely related to prokaryotic sequences than they are to sequences in other chlorophytes, and the chlorophyte IBP and ribosomal 18S phylogenies are dissimilar. The multiple IBP isoforms found in Chlamy-ICE and other algae may allow the algae to adapt to a greater variety of ice conditions than prokaryotes, which typically have a single IBP gene. The predicted structure of the DUF3494 domain has an ice-binding face with an orderly array of hydrophilic side chains. The results indicate that Chlamy-ICE acquired its IBP genes by HGT in a single event. The acquisitions of IBP genes by this and other species of Antarctic algae by HGT appear to be key evolutionary events that allowed algae to extend their ranges into polar environments.

}, keywords = {LTER-MCM}, doi = {10.1111/jpy.12550}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/jpy.12550}, author = {Raymond, James A. and Rachael M. Morgan-Kiss}, editor = {Valentin, K.} } @article {4017, title = {Microbial Community Dynamics in Two Polar Extremes: The Lakes of the McMurdo Dry Valleys and the West Antarctic Peninsula Marine Ecosystem}, journal = {BioScience}, volume = {66}, year = {2016}, month = {Jan-10-2016}, pages = {829 - 847}, keywords = {LTER-MCM}, issn = {0006-3568}, doi = {10.1093/biosci/biw103}, url = {https://academic.oup.com/bioscience/article-lookup/doi/10.1093/biosci/biw103https://academic.oup.com/bioscience/article/66/10/829/2236137/Microbial-Community-Dynamics-in-Two-Polar-Extremes}, author = {Bowman, Jeff S. and Trista J. Vick-Majors and Rachael M. Morgan-Kiss and Cristina D. Takacs-Vesbach and Hugh W. Ducklow and John C. Priscu} } @article {3952, title = {Microbial Community Responses to Increased Water and Organic Matter in the Arid Soils of the McMurdo Dry Valleys, Antarctica}, journal = {Frontiers in Microbiology}, volume = {7}, year = {2016}, month = {07/2016}, chapter = {1040}, keywords = {LTER-MCM}, doi = {10.3389/fmicb.2016.01040}, url = {http://journal.frontiersin.org/article/10.3389/fmicb.2016.01040}, author = {Heather N. Buelow and Winter, Ara S. and David J. Van Horn and John E. Barrett and Michael N. Gooseff and Schwartz, Egbert and Cristina D. Takacs-Vesbach} } @article {4013, title = {Microbial Community Structure of Subglacial Lake Whillans, West Antarctica}, journal = {Frontiers in Microbiology}, volume = {7}, year = {2016}, month = {Oct-09-2017}, keywords = {LTER-MCM}, doi = {10.3389/fmicb.2016.01457}, url = {http://journal.frontiersin.org/Article/10.3389/fmicb.2016.01457/abstract}, author = {Achberger, Amanda and Brent C. Christner and Alexander B. Michaud and John C. Priscu and Skidmore, Mark L. and Trista J. Vick-Majors} } @article {3710, title = {Microbial Mat Communities along an Oxygen Gradient in a Perennially Ice-Covered Antarctic Lake}, journal = {Applied and Environmental Microbiology}, volume = {82}, year = {2016}, month = {01/2016}, pages = {620 - 630}, keywords = {LTER-MCM}, issn = {0099-2240}, doi = {10.1128/AEM.02699-15}, url = {http://aem.asm.org/lookup/doi/10.1128/AEM.02699-15}, author = {Jungblut, Anne D. and Ian Hawes and Mackey, Tyler J. and Krusor, Megan and Peter T. Doran and Sumner, Dawn Y. and Eisen, Jonathan A. and Hillman, Colin and Goroncy, Alexander K.}, editor = {Stams, A. J.} } @phdthesis {4090, title = {Microbially mediated biogeochemical cycles in polar ice covered lakes}, volume = {Ph.D.}, year = {2016}, school = {Montana State University}, type = {doctoral}, address = {Bozeman, MT}, abstract = {

Lakes are important sites for globally-relevant biogeochemical cycles mediated by microorganisms. In the Arctic, seasonally ice covered thermokarst lakes are a large component in Earth\&$\#$39;s carbon cycle due to their methane emissions from organic carbon degradation. In the Antarctic, over 400 unexplored lakes exist beneath the Antarctic ice sheet with unknown biogeochemical contributions to the Earth system. This dissertation seeks to investigate the biogeochemical role of microorganisms in the lake habitat and how they interact with the seasonal and permanent ice covers of lakes in polar environments. Microbiologically clean hot water drilling was used to access a subglacial lake beneath Antarctica\&$\#$39;s ice to collect, for the first time, intact sediment and water samples. Laboratory experiments on Arctic and Antarctic, seasonally and perennially, respectively, ice covered lakes were used to investigate the impact of lake ice freezing regimes on microorganisms. My results show that subglacial lake sediments beneath the West Antarctic Ice Sheet contain solute ratios that suggest relict marine sediments were deposited during previous interglacial periods. Microbial activity overprints the marine geochemical signature to produce fluxes of ions into the Subglacial Lake Whillans water column, which ultimately drains to the Southern Ocean. Microbial activity in Subglacial Lake Whillans is partially fueled by biologically-formed methane diffusing from below our deepest collected (~38 cm) subglacial sediment samples. The ice above Subglacial Lake Whillans appears to be an important source of molecular oxygen for microorganisms to drive oxidative physiologies. My experimental evidence shows microorganisms incorporate into lake ice cover to, potentially, avoid increasing stressors from progressive lake ice freezing. Taken together, the results from this dissertation reinforce the hypothesis that subglacial environments beneath the Antarctic ice sheet are habitats for life. Further, the microorganisms in subglacial lakes participate in globally-relevant biogeochemical cycles. Here, I extend the extent of the biosphere and show sediments at the base of ice sheets are an active component of the Earth system.

}, keywords = {LTER-MCM}, url = {https://scholarworks.montana.edu/xmlui/handle/1/13793}, author = {Alexander B. Michaud}, editor = {John C. Priscu} } @mastersthesis {4081, title = {Modeling Surface Photosynthetic Active Radiation in Taylor Valley, McMurdo Dry Valleys, Antarctica}, volume = {M.S.}, year = {2016}, school = {University of Illinois at Chicago}, type = {masters}, address = {Chicago, IL}, abstract = {

Understanding primary productivity is a core research area of the National Science Foundation\’s Long-Term Ecological Research Network. This study maps surface Photosynthetically Active Radiation (PAR) using long term data collected by a meteorological network in the McMurdo Dry Valleys. Four stations with ~20 years of records were used to correct T-sPAR, a topographic surface PAR model. Maximum expected daily surface PAR at meteorological stations was calculated for Taylor Valley, through statistical analysis of location records using a local regression model that included 84\% of all observations. Expected values represent daily surface PAR under cloudless conditions. Daily measured and expected PAR was used to model cloud coverage at each location, corroborating that overcast conditions are positively correlated with proximity to the ocean. Ground-truth data collected for TaylorValley\’s major lakes\ during the 2015/2016 field season were used to validate T-sPAR estimates. The final model approximates total seasonal surface PAR for the Taylor Valley basin. Bi- monthly maps estimate total surface PAR by lake to assist in future sampling site selection. Finally, a user interface was developed to estimate total daily surface PAR by coordinate or surface based on a user input date.

}, keywords = {LTER-MCM, digital elevation model (DEM), geographical information system (GIS), ice-covered lakes, meteorological data, R model}, url = {http://indigo.uic.edu/handle/10027/21180}, author = {Acosta, Dimitri R.}, editor = {Berkelhammer, Max} } @article {3919, title = {Modeling the thickness of perennial ice covers on stratified lakes of the Taylor Valley, Antarctica}, journal = {Journal of Glaciology}, year = {2016}, month = {06/2016}, pages = {1 - 10}, chapter = {1}, abstract = {
A 1-D ice cover model was developed to predict and constrain drivers of long-term ice thickness trends in chemically stratified lakes of Taylor Valley, Antarctica. The model is driven by surface radiative heat fluxes and heat fluxes from the underlying water column. The model successfully reproduced 16 a (between 1996 and 2012) of ice thickness changes for the west lobe of Lake Bonney (average ice thickness = 3.53 m) and Lake Fryxell (average ice thickness = 4.22 m). Long-term ice thickness trends require coupling with the thermal structure of the water column. The heat stored within the temperature maximum of lakes exceeding a liquid water column depth of 20 m can either impede or facilitate ice thickness change depending on the predominant climatic trend (cooling or warming). As such, shallow (\<20 m deep water columns) perennially ice-covered lakes without deep temperature maxima are more sensitive indicators of climate change. The long-term ice thickness trends are a result of surface energy flux and heat flux from the deep temperature maximum in the water column, the latter of which results from absorbed solar radiation.

}, keywords = {LTER-MCM}, issn = {0022-1430}, doi = {10.1017/jog.2016.69}, url = {http://www.journals.cambridge.org/abstract_S0022143016000691}, author = {Maciek K. Obryk and Peter T. Doran and J. A. Hicks and Christopher P. McKay and John C. Priscu} } @article {3716, title = {Mitochondrial DNA analyses reveal widespread tardigrade diversity in Antarctica}, journal = {Invertebrate Systematics}, volume = {29}, year = {2015}, month = {12/2015}, pages = {578}, keywords = {LTER-MCM}, issn = {1445-5226}, doi = {10.1071/IS14019}, url = {http://www.publish.csiro.au/?paper=IS14019}, author = {Velasco-Castrillon, Alejandro and McInnes, Sandra J. and Schultz, Mark B. and Arroniz-Crespo, Maria and D{\textquoteright}Haese, Cyrille A. and Gibson, John A. E. and Byron Adams and Page, Timothy J. and Austin, Andrew D. and Cooper, Steven J. B. and Stevens, Mark I.} } @article {3202, title = {The McMurdo Dry Valleys: A landscape on the threshold of change}, journal = {Geomorphology}, volume = {225}, year = {2014}, month = {11/2014}, pages = {25 - 35}, abstract = {

Field observations of coastal and lowland regions in the McMurdo Dry Valleys suggest they are on the threshold of rapid topographic change, in contrast to the high elevation upland landscape that represents some of the lowest rates of surface change on Earth. A number of landscapes have undergone dramatic and unprecedented landscape changes over the past decade including, the Wright Lower Glacier (Wright Valley) \— ablated several tens of meters, the Garwood River (Garwood Valley) has incised \>\ 3\ m into massive ice permafrost, smaller streams in Taylor Valley (Crescent, Lawson, and Lost Seal Streams) have experienced extensive down-cutting and/or bank undercutting, and Canada Glacier (Taylor Valley) has formed sheer, \>\ 4\ meter deep canyons. The commonality between all these landscape changes appears to be sediment on ice acting as a catalyst for melting, including ice-cement permafrost thaw. We attribute these changes to increasing solar radiation over the past decade despite no significant trend in summer air temperature. To infer possible future landscape changes in the McMurdo Dry Valleys, due to anticipated climate warming, we map \‘at risk\’ landscapes defined as those with buried massive ice in relative warm regions of the valleys. Results show that large regions of the valley bottoms are \‘at risk\’. Changes in surface topography will trigger important responses in hydrology, geochemistry, and biological community structure and function.

}, keywords = {LTER-MCM}, issn = {0169555X}, doi = {10.1016/j.geomorph.2014.03.044}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0169555X14001780http://api.elsevier.com/content/article/PII:S0169555X14001780?httpAccept=text/xmlhttp://api.elsevier.com/content/article/PII:S0169555X14001780?httpAccept=text/plain}, author = {Andrew G Fountain and Joseph S. Levy and Michael N. Gooseff and David J. Van Horn} } @article {1072, title = {Microbial biomass and respiration responses to nitrogen fertilization in a polar desert}, journal = {Polar Biology}, year = {2014}, month = {01/2014}, keywords = {LTER-MCM}, doi = {10.1007/s00300-014-1459-0}, url = {http://link.springer.com/article/10.1007\%2Fs00300-014-1459-0}, author = {Ball, Becky and Ross A. Virginia} } @article {1085, title = {Modular community structure suggests metabolic plasticity during the transition to polar night in ice-covered Antarctic lakes}, journal = {The ISME Journal}, year = {2014}, month = {10/2013}, keywords = {LTER-MCM}, doi = {10.1038/ismej.2013.190}, url = {http://www.nature.com/ismej/journal/vaop/ncurrent/full/ismej2013190a.html}, author = {Trista J. Vick-Majors and John C. Priscu and Linda A. Amaral-Zettler} } @article {1088, title = {Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica}, journal = {Environmental Research Letters}, volume = {8}, year = {2013}, month = {09/2013}, pages = {035022}, abstract = {During the austral summers of 2004 and 2009, we sampled a supraglacial stream on the Cotton Glacier, Antarctica. The stream dissolved organic matter (DOM) was low (44{\textendash}48 μM C) and lacked detectable humic fluorescence signatures. Analysis of the excitation emissions matrices (EEMs) indicated that amino-acid fluorophores dominated, consistent with DOM of microbial origin, with little humic-like fluorescence. In most aquatic ecosystems, humic DOM attenuates harmful UV radiation and its absence may represent an additional stressor influencing the microbial community. Nonetheless, the stream contained an active microbial assemblage with bacterial cell abundances from 2.94 {\texttimes} 104 to 4.97 {\texttimes} 105 cells ml-1, and bacterial production ranging from 58.8 to 293.2 ng C l-1 d-1. Chlorophyll-a concentrations ranged from 0.3 to 0.53 μg l-1 indicating that algal phototrophs were the probable source of the DOM. Microbial isolates produced a rainbow of pigment colors, suggesting adaptation to stress, and were similar to those from other cryogenic systems (Proteobacteria and Bacteroidetes lineages). Supraglacial streams provide an example of contemporary microbial processes on the glacier surface and a natural laboratory for studying microbial adaptation to the absence of humics.}, keywords = {LTER-MCM}, doi = {10.1088/1748-9326/8/3/035022}, url = {http://iopscience.iop.org/1748-9326/8/3/035022}, author = {Christine M. Foreman and Rose M. Cory and Morris, Cindy E and Michael D. SanClements and Smith, Heidi J and John T. Lisle and Penney L. Miller and Yu-Ping Chin and Diane M. McKnight} } @article {1080, title = {Micro-hole and multigrain quartz luminescence dating of Paleodeltas at Lake Fryxell, McMurdo Dry Valleys (Antarctica), and relevance for lake history}, journal = {Quaternary Geochronology}, volume = {18}, year = {2013}, month = {12/2013}, pages = {119 - 134}, keywords = {LTER-MCM}, doi = {10.1016/j.quageo.2013.04.002}, url = {http://www.sciencedirect.com/science/article/pii/S1871101413000423}, author = {G. W. Berger and Peter T. Doran and Thomsen, K.J.} } @article {1112, title = {Meltwater seep patches increase heterogeneity of soil geochemistry and therefore habitat suitability}, journal = {Geoderma}, volume = {189-190}, year = {2012}, month = {11/2012}, pages = {652 - 660}, keywords = {LTER-MCM}, doi = {10.1016/j.geoderma.2012.06.028}, author = {Ball, Becky and Ross A. Virginia} } @article {1113, title = {Microbial dynamics and flagellate grazing during transition to winter in Lakes Hoare and Bonney, Antarctica}, journal = {FEMS Microbiology Ecology}, volume = {82}, year = {2012}, month = {11/2012}, pages = {449 - 458}, keywords = {LTER-MCM}, doi = {10.1111/j.1574-6941.2012.01423.x}, url = {http://onlinelibrary.wiley.com/doi/10.1111/j.1574-6941.2012.01423.x/full}, author = {Jill Thurman and Jacqueline Parry and Philip J. Hill and John C. Priscu and Trista J. Vick-Majors and Amy Chiuchiolo and Johanna Laybourn-Parry} } @article {3528, title = {Microbial life at -13 ~C in the brine of an ice-sealed Antarctic lake}, journal = {Proceedings of the National Academy of Sciences}, volume = {109}, year = {2012}, month = {12/2012}, pages = {20626 - 20631}, keywords = {LTER-MCM}, issn = {0027-8424}, doi = {10.1073/pnas.1208607109}, url = {http://www.pnas.org/cgi/doi/10.1073/pnas.1208607109}, author = {A. E. Murray and Kenig, Fabien and Christian H. Fritsen and Christopher P. McKay and Kaelin M. Cawley and R. L. Edwards and Kuhn, Emanuele and Diane M. McKnight and Nathaniel E Ostrom and Vivian Peng and Adrian Ponce and John C. Priscu and Samarkin, Vladimir A. and Ashley T Townsend and Protima Wagh and Seth A Young and Pung To Yung and Peter T. Doran} } @mastersthesis {4162, title = {Modeling nitrate concentrations in an Antarctic glacial meltwater stream under fluctuating hydrologic conditions and nitrate inputs}, volume = {M.S.}, year = {2012}, school = {Pennsylvania State University}, type = {masters}, abstract = {

The McMurdo Dry Valleys comprise a unique polar desert ecosystem in Victoria Land, Antarctica. The hydrologic system in the Dry Valleys is often characterized as being simplified compared to temperate watersheds, due to the ability to identify physical boundaries and nutrient sources and sinks. We seek to characterize the evolution of streamflow, solutes, and nutrients along a glacial meltwater stream in the McMurdo Dry Valleys, and to understand the role of different sources and sinks under varying hydrologic conditions. The study presented here includes streamflow routing, solute modeling, and nitrate concentration modeling in Von Guerard stream, a stream with abundant algal coverage in the McMurdo Dry Valleys region of Antarctica. The streamflow model is a solution to the kinematic wave routing problem. Solute modeling addresses advection, dispersion, as well as hyporheic zone inputs, which are controlled by weathering and hyporheic exchange. Lastly, the nitrate model builds on the solute model with the addition of a gross primary production (GPP) component. Results indicate that the hyporheic source of nitrate is controlling due to rapid exchange with the main channel. GPP impacts are small due to light-saturated conditions for a majority of the season, but provide a consistent sink for nitrate. The role of advective and dispersive transport is highly dependent on flow conditions, with advective transport controlling at high flows and dispersive controlling at low flows.

}, keywords = {LTER-MCM, hydrology, hyporheic zone, nitrate, nutrients, primary productivity, stream}, url = {https://etda.libraries.psu.edu/catalog/15316}, author = {Bernzott, Emily D. and Michael N. Gooseff} } @article {1143, title = {MCM IV: Getting Connected}, volume = {2013}, year = {2011}, publisher = {LTER News}, edition = {Fall 2011}, keywords = {LTER-MCM}, url = {http://news.lternet.edu/Article2316.html}, author = {Howkins, Adrian} } @article {3538, title = {Microclimate impacts of passive warming methods in Antarctica: implications for climate change studies}, journal = {Polar Biology}, volume = {34}, year = {2011}, month = {10/2011}, pages = {1421 - 1435}, keywords = {LTER-MCM}, issn = {0722-4060}, doi = {10.1007/s00300-011-0997-y}, url = {http://link.springer.com/10.1007/s00300-011-0997-y}, author = {Bokhorst, Stef and Huiskes, Ad and Peter Convey and Sinclair, Brent J. and Lebouvier, Marc and Bart Van de Vijver and Diana H. Wall} } @inbook {1144, title = {Molecular analysis of desiccation survival in Antarctic nematodes}, booktitle = {Molecular and Physiological Basis of Nematode Survival}, year = {2011}, pages = {205-232}, publisher = {CABI International}, organization = {CABI International}, address = {Wallingford}, keywords = {LTER-MCM}, isbn = {9781845936877}, author = {Bishwo N. Adhikari and Byron Adams} } @book {1145, title = {Molecular and physiological basis of nematode survival: Molecular analyses of desiccation survival in Antarctic nematodes.}, year = {2011}, pages = {205 - 232}, publisher = {CABI}, organization = {CABI}, address = {Wallingford}, keywords = {LTER-MCM}, doi = {10.1079/9781845936877.0205}, author = {Bishwo N. Adhikari and Byron Adams}, editor = {Perry, R. N. and Wharton, D. A.} } @article {1134, title = {Molecular study of worldwide distribution and diversity of soil animals}, journal = {Proceedings of the National Academy of Sciences}, volume = {108}, year = {2011}, month = {10/2011}, pages = {17720 - 17725}, keywords = {LTER-MCM}, doi = {10.1073/pnas.1103824108}, author = {Tiehang Wu and Edward Ayres and Richard D. Bardgett and Diana H. Wall and James R. Garey} } @phdthesis {1177, title = {Microbial interactions with dissolved organic matter in saline natural waters}, year = {2010}, school = {University of Colorado}, type = {doctoral}, keywords = {LTER-MCM}, doi = {LTER}, author = {Cawley, K} } @article {1198, title = {Managing for ocean biodiversity to sustain marine ecosystem services}, journal = {FRONTIERS IN ECOLOGY AND THE ENVIRONMENT}, volume = {7}, year = {2009}, pages = {204-211}, keywords = {LTER-MCM}, doi = {LTER}, author = {Palumbi, S and Norse, E and Stachowicz, J and Diana H. Wall and Sandifer, P and Allan, J and Beck, M and Fautin, D and Fogerty, M and Halpern, B and Incze, L and Leong, J} } @phdthesis {1199, title = {The Minor Alkaline Earth Element and Alkali Metal Behavior in Closed-basin Lakes}, year = {2009}, school = {The Ohio State University}, type = {doctoral}, keywords = {LTER-MCM}, doi = {LTER}, author = {Witherow, R} } @article {1200, title = {Molecular profiling of soil animal diversity in natural ecosystems: incongruence of molecular and morphological results}, journal = {Soil Biology and Biochemistry}, year = {2009}, pages = {849-857}, keywords = {LTER-MCM}, doi = {10.1016/j.soilbio.2009.02.003}, author = {Wu, T and Edward Ayres and Li, G and Richard D. Bardgett and Diana H. Wall and James R. Garey} } @article {1218, title = {Mercury Deposition in a Polar Desert Ecosystem}, journal = {Environmental Science and Technology}, volume = {42}, year = {2008}, pages = {4710-4716}, keywords = {LTER-MCM}, doi = {LTER}, author = {Witherow, R and W. Berry Lyons} } @article {1232, title = {Microbial community composition in soils of Northern Victoria Land, Antarctica}, journal = {Environmental Microbiology}, volume = {10}, year = {2008}, pages = {1713-1724}, keywords = {LTER-MCM}, doi = {LTER}, author = {Niederberger, T and McDonald, i and Hacker, A and Soo, R and John E. Barrett and Diana H. Wall and Craig S Cary} } @phdthesis {1219, title = {Microbial diversity and function at aquatic- terrestrial interfaces in desert ecosystems.}, volume = {Ph.D.}, year = {2008}, school = {University of New Mexico}, type = {doctoral}, keywords = {LTER-MCM}, doi = {LTER}, author = {Lydia H. Zeglin} } @article {1254, title = {A mathematical model for variation in water-retention curves among sandy soils}, journal = {Antarctic Science}, volume = {19}, year = {2007}, pages = {427-436}, keywords = {LTER-MCM}, doi = {LTER}, author = {Hunt , H and Amy M Treonis and Diana H. Wall and Ross A. Virginia} } @article {1244, title = {Mesoscale dynamics of ephemeral wetlands in the Antarctic Dry Valleys: Implications to production and distribution of organic matter}, journal = {Ecosystems}, year = {2007}, pages = {87-95}, keywords = {LTER-MCM}, doi = {LTER}, author = {Daryl L. Moorhead} } @article {1245, title = {Metabolic activity and diversity of cryoconites in the Taylor Valley, Antarctica}, journal = {Journal of Geophysical Research}, volume = {112}, year = {2007}, keywords = {LTER-MCM}, doi = {LTER}, author = {Christine M. Foreman and Sattler, B and Jill A. Mikucki and Porazinska, D and John C. Priscu} } @mastersthesis {1246, title = {Microbial Processes in the Moats of Lakes in the Taylor Valley, Antarctica}, volume = {M.S.}, year = {2007}, school = {Montana State University}, type = {masters}, keywords = {LTER-MCM}, doi = {LTER}, author = {Moore, J} } @article {1272, title = {Measuring ecosystem response in a rapidly changing environment: the Latitudinal Gradient Project}, journal = {Antarctic Science.}, volume = {10}, year = {2006}, keywords = {LTER-MCM}, doi = {LTER}, author = {Clive Howard-Williams and Peterson, D and W. Berry Lyons and Cattaneo-Vietti, R and Shulamit Gordon} } @mastersthesis {1314, title = {Mathematical Modeling of a Hydrocarbon Spill on the Ice Cover of Lake Fryxell, Antarctica}, volume = {M.S.}, year = {2005}, month = {06/2005}, pages = {114}, school = {The Ohio State University}, type = {masters}, address = {Columbus}, abstract = {

Numerous perennially ice-covered lakes exist in the McMurdo Dry Valleys region of Antarctica. Ice cover melting on these lakes and meltwater infiltration are important processes affecting the ecology of these lakes. The three lakes in Taylor Valley, Lakes Bonney, Fryxell and Hoare, have been investigated since 1993 as part of the McMurdo Dry Valleys Long Term Ecological Research (MCM LTER) site. A Bell 212 helicopter flying in support of the National Science Foundation\&$\#$39;s Antarctic Research Program crashed on the frozen surface of Lake Fryxell on January 17, 2003. This resulted in the release of approximately 731 Liters (193 gallons) of diesel fuel and amounts of engine oil and hydraulic fluid. Two physically based models are developed that simulate heat, meltwater flow and solute transport. The first is a transient, one-dimensional, thermodynamic model, which can predict the temperature distribution in the ice cover, melting rate at the surface and at the bottom of ice cover, and ice thickness. The second model simulates unsaturated flow and solute transport and is used to estimate water content distribution and solute transport through the ice cover. The validation of heat transport model was accomplished by comparing model results with the original measurements of ice temperature at various depth in Lake Fryxell. Because of lack of the field data, validation of the unsaturated flow and solute transport model couldn\&$\#$39;t been accomplished, instead of model validation, programming code has been verified by comparing results with results generated by the HYDRUS 1D software, developed by U.S. Salinity Laboratory, USDA.

}, keywords = {LTER-MCM}, author = {Marinko Karnovic and Anne E. Carey and Scott E. Bair and van der Veen, Cornelis} } @mastersthesis {1315, title = {Mercury Concentrations in Snow and the Modern Mercury Flux to Taylor Valley, Antarctica}, volume = {M.S.}, year = {2005}, school = {The Ohio State University}, type = {masters}, keywords = {LTER-MCM}, doi = {LTER}, author = {Witherow, R} } @phdthesis {1302, title = {Microbial Ecology of an Antarctic Subglacial Environment}, volume = {Ph.D.}, year = {2005}, school = {Montana State University}, type = {doctoral}, keywords = {LTER-MCM}, doi = {LTER}, author = {Jill A. Mikucki} } @article {1336, title = {Microplankton dynamics in a perennially ice-covered Antarctic lake-Lake Hoare}, journal = {Freshwater Biology}, volume = {27}, year = {2004}, pages = {238-249}, keywords = {LTER-MCM}, author = {Emily C. Roberts and John C. Priscu and Johanna Laybourn-Parry} } @article {1365, title = {Map-based methods for estimating glacier equilibrium-line altitudes}, journal = {Journal of Glaciology}, volume = {49}, year = {2003}, pages = {329-336}, keywords = {LTER-MCM}, doi = {LTER}, author = {Leonard, K and Andrew G Fountain} } @article {1393, title = {Modeling the effects of loss of soil biodiversity on ecosystem function}, journal = {Global Change Biology}, volume = {8}, year = {2002}, pages = {32-49}, keywords = {LTER-MCM}, author = {Hunt , H and Diana H. Wall} } @article {1404, title = {The McMurdo Dry Valleys Long-Term Ecological Research Program: new understanding of the biogeochemistry of the Dry Valley lakes: a review.}, journal = {Polar Geography}, volume = {25}, year = {2001}, pages = {202-217}, keywords = {LTER-MCM}, author = {W. Berry Lyons and Kathleen A. Welch and John C. Priscu and Johanna Laybourn-Parry and Daryl L. Moorhead and Diane M. McKnight and Peter T. Doran and Martyn Tranter} } @article {1405, title = {Mineralogical and geochemical analyses of Antarctic lake sediments: A study of reflectanceand Mossbauer spectroscopy and C, N and S isotopes with applications for remote sensing on Mars}, journal = {Geochimica et Cosmochimica Acta}, volume = {65}, year = {2001}, pages = {2875-2897}, keywords = {LTER-MCM}, author = {Bishop, Janice L. and Lougear, A and Newton, J and Peter T. Doran and Froeschl, H and Krner, W and Koeberl, C and Trautwein, A} } @phdthesis {1366, title = {Modeling hyporheic exchange influences on biogeochemical processes in dry valley streams, Antarctica}, volume = {Ph.D.}, year = {2001}, school = {University of Colorado}, type = {doctoral}, abstract = {

The ephemeral streams of the Dry Valleys of Antarctica provide habitat to benthic algal mats, and greatly control the quantity and quality of glacial melt water that enters closed basin Dry Valley lakes. Dry Valley watersheds are composed of streambeds and adjacent hyporheic zones. Hydrologic exchange of water and solutes between the stream and the hyporheic zone has the overall effect of increasing residence time in the stream/hyporheic system. Biogeochemical reactions (e.g. chemical weathering, nutrient assimilation) occur both in the water column and in the hyporheic zone. Field experiments and solute transport modeling were employed to elucidate the effects of rapid hyporheic exchange on biogeochemical cycling in Antarctic streams. The results presented here show that (1) large portions of the wetted zone that surrounds each stream is a hyporheic zone, and that stream water exchanges into and out of extended portions of this zone on the order of weeks, (2) the rapid exchange of stream water between the water column and the hyporheic zone controls the rate of weathering in streambed sediments, and (3) denitrification in streams is limited by the conversion of NO2\ to N2O, while the conversion of NO3\ to NO2\ occurs very quickly.

}, keywords = {LTER-MCM}, author = {Michael N. Gooseff} } @inbook {1435, title = {Mixotrophy as a survival strategy among planktonic protozoa in Antarctic lakes}, booktitle = {Antarctic Ecosystems: Models for Wider Ecological Understanding}, year = {2000}, publisher = {Caxton Press}, organization = {Caxton Press}, keywords = {LTER-MCM}, author = {Johanna Laybourn-Parry and Emily C. Roberts and Elanor R. Bell}, editor = {Clive Howard-Williams and W. Davidson and P. Broady} } @proceedings {1465, title = {McMurdo Dry Valley Lakes: Impacts of Research Activities.}, year = {1999}, publisher = {Desert Research Institute, University and Community College System of Nevada, USA, special publication}, keywords = {LTER-MCM}, doi = {LTER}, author = {Robert A. Wharton Jr. and Peter T. Doran} } @article {1466, title = {McMurdo LTER: Photosynthesis in an extreme shade habitat: benthic microbial mats from Lake Hoare, Antarctica}, journal = {Journal of Phycology}, volume = {35}, year = {1999}, pages = {448-459}, keywords = {LTER-MCM}, author = {Ian Hawes and Anne-Maree Schwarz} } @article {1467, title = {Mercury in aquatic systems in Antarctica}, journal = {Geophysical Research Letters}, volume = {26}, year = {1999}, pages = {2235-2238}, keywords = {LTER-MCM}, author = {W. Berry Lyons and Kathleen A. Welch and Jean-Claude Bonzongo} } @article {1468, title = {Mixotrophic cryptophytes and their predators in the Dry Valley lakes of Antarctica}, journal = {Freshwater Biology}, volume = {41}, year = {1999}, pages = {737-745}, keywords = {LTER-MCM}, doi = {10.1046/j.1365-2427.1999.00401.x}, author = {Emily C. Roberts and Johanna Laybourn-Parry} } @article {1505, title = {The McMurdo Dry Valley Ecosystem: Organization, Controls, and Linkages, in Ecosystem Processes in a Polar Desert: The McMurdo Dry Valleys, Antarctica}, journal = {Antarctic Research Series}, volume = {72}, year = {1998}, pages = {351-363}, keywords = {LTER-MCM}, author = {Daryl L. Moorhead and John C. Priscu} } @article {1506, title = {McMurdo Dry Valleys Long-Term Ecological Research (LTER): An overview of 1995-1996 research activities}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, pages = {187-188}, keywords = {LTER-MCM}, author = {Sherry E. Jennings-Mays and Robert A. Wharton Jr.} } @article {1509, title = {McMurdo Dry Valleys LTER: Characterization of protozoan communities in lakes Hoare and Fryxell using artificial substrates}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, pages = {201-202}, keywords = {LTER-MCM}, author = {Kepner, R.L. and Robert A. Wharton Jr.} } @article {1507, title = {McMurdo Dry Valleys LTER: Density-driven mixing in Lake Hoare?}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, pages = {205}, keywords = {LTER-MCM}, author = {W. Berry Lyons and Kathleen A. Welch and Scott W. Tyler and Pankaj Sharma} } @article {1510, title = {McMurdo Dry Valleys LTER: Genetic diversity of soil nematodes in the McMurdo Dry Valleys of Antarctica}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, pages = {203-204}, keywords = {LTER-MCM}, author = {Courtright, Ericha M and Diana W. Freckman and Ross A. Virginia and W. Kelley Thomas} } @article {1484, title = {McMurdo Dry Valleys LTER: Geophysical determination of bathymetry and morphology of Taylor Valley lakes}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, month = {01/1996}, pages = {198-200}, keywords = {LTER-MCM}, author = {Peter T. Doran and Robert A. Wharton Jr. and Jeffrey P. Schmok} } @article {1511, title = {McMurdo Dry Valleys LTER: Phosphorus deficiency and alkaline phosphatase activity in lakes of Taylor Valley, Antarctica}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, pages = {206-208}, keywords = {LTER-MCM}, author = {John E. Dore and John C. Priscu} } @article {1512, title = {McMurdo Dry Valleys LTER: Solar radiation on glaciers in Taylor Valley, Antarctica}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, pages = {191-193}, keywords = {LTER-MCM}, author = {Gayle L. Dana and Robert A. Wharton Jr. and Andrew G Fountain} } @article {1513, title = {McMurdo Dry Valleys LTER: Spatial variation of glacier mass balance in Taylor Valley, Antarctica}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, pages = {194-195}, keywords = {LTER-MCM}, author = {Andrew G Fountain and Karen J. Lewis and Gayle L. Dana} } @article {1508, title = {McMurdo Dry Valleys LTER: Stream discharge as a function of ambient temperature and incoming shortwave radiation in Taylor Valley, Antarctica}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, pages = {196-197}, keywords = {LTER-MCM}, author = {Daryl L. Moorhead and Diane M. McKnight} } @article {1514, title = {McMurdo Dry Valleys LTER: The role of terminus cliff melt in streamflow, Taylor Valley, Antarctica}, journal = {Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)}, volume = {31}, year = {1998}, pages = {189-190}, keywords = {LTER-MCM}, author = {Karen J. Lewis and Andrew G Fountain and Paul Langevin} } @article {1515, title = {Mercury speciation and distribution in a polar desert lake (Lake Hoare, Antarctica) and two glacial meltwater streams}, journal = {Science of the Total Environment}, volume = {213}, year = {1998}, pages = {229-237}, keywords = {LTER-MCM}, author = {Vandal, G.M. and R.P. Mason and Diane M. McKnight and W. Fitzgerald} } @article {1516, title = {Microbial phototrophic, heterotrophic, and diazotrophic activities associated with aggregates in the permanent ice cover of Lake Bonney, Antarctica}, journal = {Microbial Ecology}, volume = {36}, year = {1998}, pages = {221-230}, keywords = {LTER-MCM}, author = {Hans W. Paerl and John C. Priscu} } @article {1517, title = {Modeling Nitrogen Transformations in Dry Valley Streams, Antarctica, in Ecosystem Processes in a Polar Desert: The McMurdo Dry Valleys, Antarctica}, journal = {Antarctic Research Series}, volume = {72}, year = {1998}, pages = {141-151}, keywords = {LTER-MCM}, author = {Daryl L. Moorhead and Diane M. McKnight and Cathy M. Tate} } @article {1567, title = {The measurement of reactive silicate in saline-hypersaline lakes: examples of the problem}, journal = {International Journal of Salt Lake Research}, year = {1997}, keywords = {LTER-MCM} } @inbook {1559, title = {The microbial loop in Antarctic lakes}, booktitle = {Ecosystem Processes in Antarctic Ice-free Landscapes}, year = {1997}, pages = {231-240}, publisher = {Balkema Press}, organization = {Balkema Press}, address = {Rotterdam}, keywords = {LTER-MCM}, author = {Johanna Laybourn-Parry} } @article {1560, title = {The microbial plankton of Lake Fryxell, southern Victoria Land, Antarctica during the summers of 1992 and 1994}, journal = {Polar Biology}, volume = {17}, year = {1997}, pages = {54-61}, keywords = {LTER-MCM}, author = {Johanna Laybourn-Parry and Mark R. James and Diane M. McKnight and John C. Priscu and Sarah A. Spaulding and Russell Shiel} } @article {1576, title = {Microcosms and Soil Ecology: Critical Linkages Between Field Studies and Modelling Food Webs}, journal = {Ecology}, volume = {77}, year = {1996}, pages = {694-705}, keywords = {LTER-MCM}, author = {John C. Moore and Peter C. De Ruiter and H. William Hunt and David C. Coleman and Diana W. Freckman} } @article {1608, title = {McMurdo Dry Valleys Long-Term Ecological Research (LTER): An overview of 1994-1995 research activities}, journal = {Antarctic Journal of the U.S.}, volume = {30}, year = {1995}, pages = {275-276}, keywords = {LTER-MCM}, author = {Robert A. Wharton Jr.} } @article {1588, title = {McMurdo Dry Valleys Long-Term Ecological Research (LTER): LTER automatic weather network (LAWN)}, journal = {Antarctic Journal of the U.S.}, volume = {30}, year = {1995}, pages = {276-280}, keywords = {LTER-MCM}, author = {Peter T. Doran and Gayle L. Dana and Hastings, Jordan Towner and Robert A. Wharton Jr.} } @article {1589, title = {McMurdo LTER: Algal mat distribution in glacial meltwater streams in Taylor Valley, southern Victoria Land, Antarctica}, journal = {Antarctic Journal of the United States}, volume = {30}, year = {1995}, pages = {287-289}, keywords = {LTER-MCM}, author = {Diane M. McKnight and Cathy M. Tate} } @article {1590, title = {McMurdo LTER: Comparative limnology of the Taylor Valley lakes: The major solutes}, journal = {Antarctic Journal of the U.S.}, volume = {30}, year = {1995}, pages = {292-293}, keywords = {LTER-MCM}, author = {Kathleen A. Welch and W. Berry Lyons} } @article {1591, title = {McMurdo LTER: Photosynthesis in benthic cyanobacterial mats from Lake Hoare, Antarctica}, journal = {Antarctic Journal of the U.S.}, volume = {30}, year = {1995}, pages = {296-297}, keywords = {LTER-MCM}, author = {Ian Hawes and Anne-Maree Schwarz} } @article {1609, title = {McMurdo LTER: Progress with the Taylor Valley geographic information system}, journal = {Antarctic Journal of the U.S.}, volume = {30}, year = {1995}, pages = {297-299}, keywords = {LTER-MCM}, author = {Hastings, Jordan Towner} } @article {1592, title = {McMurdo LTER: Relationships between vertical nutrient flux and phytoplankton biomass and productivity in lakes of the Taylor Valley, Antarctica}, journal = {Antarctic Journal of the U.S.}, volume = {30}, year = {1995}, pages = {294-295}, keywords = {LTER-MCM}, author = {R. L. Edwards and John C. Priscu} } @article {1593, title = {McMurdo LTER: Soil properties associated with nematode distribution along an elevational transect in Taylor Valley, Antarctica}, journal = {Antarctic Journal of the U.S.}, volume = {30}, year = {1995}, pages = {282-283}, keywords = {LTER-MCM}, author = {Powers, Laura E. and Diana W. Freckman and Mengchi Ho and Ross A. Virginia} } @article {1594, title = {McMurdo LTER: Species composition and spatial distribution of algal mats in Green Creek, Taylor Valley, Antarctica}, journal = {Antarctic Journal of the U. S.}, volume = {30}, year = {1995}, pages = {289-291}, keywords = {LTER-MCM}, author = {Alexander S. Alger and Sarah A. Spaulding and Gordon H Shupe and Diane M. McKnight} } @article {1595, title = {McMurdo LTER: The surface-energy balance of the Canada Glacier, Taylor Valley}, journal = {Antarctic Journal of the United States}, volume = {30}, year = {1995}, pages = {280-282}, keywords = {LTER-MCM}, author = {Karen J. Lewis and Gayle L. Dana and Scott W. Tyler and Andrew G Fountain} } @article {1630, title = {McMurdo Dry Valleys LTER: An overview of 1993-1994 research activities}, journal = {Antarctic Journal of the U.S.}, volume = {29}, year = {1994}, pages = {224-226}, keywords = {LTER-MCM}, author = {Robert A. Wharton Jr.} } @article {1614, title = {McMurdo LTER: Developing a geographic information system access system}, journal = {Antarctic Journal of the U.S.}, volume = {29}, year = {1994}, pages = {246-247}, keywords = {LTER-MCM}, author = {Hastings, Jordan Towner and Anya Z. Butt} } @article {1615, title = {McMurdo LTER: Developing a geographic information system database}, journal = {Antarctic Journal of the U.S.}, volume = {29}, year = {1994}, pages = {244-245}, keywords = {LTER-MCM}, author = {Anya Z. Butt and Hastings, Jordan Towner} } @article {1616, title = {McMurdo LTER: Glacier mass balances of Taylor Valley, Antarctica}, journal = {Antarctic Journal of the U.S.}, volume = {29}, year = {1994}, pages = {226-228}, keywords = {LTER-MCM}, author = {Andrew G Fountain and Bruce H. Vaughn and Gayle L. Dana} } @article {1617, title = {McMurdo LTER: Inorganic geochemical studies with special reference to calcium carbonate dynamics}, journal = {Antarctic Journal of the U.S.}, volume = {29}, year = {1994}, pages = {237-239}, keywords = {LTER-MCM}, author = {Kathleen A. Welch and W. Berry Lyons and John C. Priscu and R. L. Edwards and Diane M. McKnight and Harold R. House and Robert A. Wharton Jr.} } @article {1618, title = {McMurdo LTER: Paleolimnology of Taylor Valley, Antarctica}, journal = {Antarctic Journal of the United States}, volume = {29}, year = {1994}, pages = {234-237}, keywords = {LTER-MCM}, doi = {LTER}, author = {Peter T. Doran and Robert A. Wharton Jr. and Sarah A. Spaulding and J. S. Foster} } @article {1631, title = {McMurdo LTER: Phytoplankton nutrient deficiency in lakes of the Taylor Valley, Antarctica}, journal = {Antarctic Journal of the U.S.}, volume = {29}, year = {1994}, pages = {239-241}, keywords = {LTER-MCM}, author = {John C. Priscu} } @article {1619, title = {McMurdo LTER: Primary production model of benthic microbial mats in Lake Hoare, Antarctica}, journal = {Antarctic Journal of the U.S.}, volume = {29}, year = {1994}, pages = {241-243}, keywords = {LTER-MCM}, author = {Daryl L. Moorhead and Robert A. Wharton Jr.} } @article {1620, title = {McMurdo LTER: Streamflow Measurements in Taylor Valley}, journal = {Antarctic Journal of the United States}, volume = {29}, year = {1994}, pages = {230-232}, keywords = {LTER-MCM}, author = {Diane M. McKnight and Harold R. House and Paul Von Gerard} } @article {1621, title = {McMurdo LTER: Using narrow band spectroradiometry to assess algal and moss communities in a dry valley stream}, journal = {Antarctic Journal of the U.S.}, volume = {29}, year = {1994}, pages = {232-234}, keywords = {LTER-MCM}, author = {Gayle L. Dana and Cathy M. Tate and Sharon L. Dewey} } @article {1622, title = {McMurdo LTER:Soil and nematode distribution along an elevational gradient in Taylor Valley, Antarctica}, journal = {Antarctic Journal of the U.S.}, volume = {29}, year = {1994}, pages = {228-229}, keywords = {LTER-MCM}, author = {Powers, Laura E. and Diana W. Freckman and Mengchi Ho and Ross A. Virginia} } @article {1639, title = {Microbial communities in the permanent ice cap of Lake Bonney, Antarctica: Relationships among chlorophyll-a , gravel, and nutrients.}, journal = {Antarctic Journal of the U.S}, volume = {28}, year = {1993}, pages = {247-249}, keywords = {LTER-MCM}, author = {Wing, Kate T. and John C. Priscu} } @article {1640, title = {Microbial respiration potential in Lake Bonney using a novel tetrazolium-reduction method}, journal = {Antarctic Journal of the U.S.}, volume = {28}, year = {1993}, pages = {244-245}, keywords = {LTER-MCM}, author = {Smith, James J. and John C. Priscu} } @article {3241, title = {McMurdo Dry Valleys: A cold desert ecosystem}, year = {1991}, month = {10/1991}, keywords = {LTER-MCM}, url = {https://mcm.lternet.edu/sites/default/files/MCM_1991_Report.pdf}, author = {Robert A. Wharton Jr.} }