TY - JOUR T1 - The geochemistry of upland ponds, Taylor Valley, Antarctica JF - Antarctic Science Y1 - 2012 A1 - W. Berry Lyons A1 - Kathleen A. Welch A1 - Christopher B. Gardner A1 - Chris Jaros A1 - Daryl L. Moorhead A1 - Knoepfle, J A1 - Peter T. Doran VL - 24 UR - http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8483351 IS - 01 ER - TY - JOUR T1 - Biogeochemical stoichiometry of Antarctic Dry Valley ecosystems JF - Journal of Geophysical Research Y1 - 2007 A1 - John E. Barrett A1 - Ross A. Virginia A1 - W. Berry Lyons A1 - Diane M. McKnight A1 - John C. Priscu A1 - Andrew G Fountain A1 - Diana H. Wall A1 - Daryl L. Moorhead A1 - Peter T. Doran KW - Biggie AB -

Among aquatic and terrestrial landscapes of the McMurdo Dry Valleys, Antarctica, ecosystem stoichiometry ranges from values near the Redfield ratios for C:N:P to nutrient concentrations in proportions far above or below ratios necessary to support balanced microbial growth. This polar desert provides an opportunity to evaluate stoichiometric approaches to understand nutrient cycling in an ecosystem where biological diversity and activity are low, and controls over the movement and mass balances of nutrients operate over 10–106 years. The simple organisms (microbial and metazoan) comprising dry valley foodwebs adhere to strict biochemical requirements in the composition of their biomass, and when activated by availability of liquid water, they influence the chemical composition of their environment according to these ratios. Nitrogen and phosphorus varied significantly in terrestrial and aquatic ecosystems occurring on landscape surfaces across a wide range of exposure ages, indicating strong influences of landscape development and geochemistry on nutrient availability. Biota control the elemental ratio of stream waters, while geochemical stoichiometry (e.g., weathering, atmospheric deposition) evidently limits the distribution of soil invertebrates. We present a conceptual model describing transformations across dry valley landscapes facilitated by exchanges of liquid water and biotic processing of dissolved nutrients. We conclude that contemporary ecosystem stoichiometry of Antarctic Dry Valley soils, glaciers, streams, and lakes results from a combination of extant biological processes superimposed on a legacy of landscape processes and previous climates.

VL - 112 ER - TY - JOUR T1 - Mesoscale dynamics of ephemeral wetlands in the Antarctic Dry Valleys: Implications to production and distribution of organic matter JF - Ecosystems Y1 - 2007 A1 - Daryl L. Moorhead IS - 10 ER - TY - JOUR T1 - Environmental factors associated with deep chlorophyll maxima in dry valley lakes, South Victoria Land, Antarctica JF - Arctic, Antarctic, and Alpine Research Y1 - 2006 A1 - Burnett, L A1 - Daryl L. Moorhead A1 - Ian Hawes A1 - Clive Howard-Williams VL - 38 ER - TY - JOUR T1 - Simulating energy flow through a pelagic food web in Lake Fryxell, Antarctica JF - Ecological Modelling Y1 - 2006 A1 - McKenna, K A1 - Daryl L. Moorhead A1 - Emily C. Roberts A1 - Johanna Laybourn-Parry VL - 192 ER - TY - JOUR T1 - Terrestrial ecosystem processes of Victoria Land, Antarctica JF - Soil Biology and Biochemistry Y1 - 2006 A1 - John E. Barrett A1 - Johnson N. Nkem A1 - Sletten, R A1 - Steltzer, H A1 - Diana H. Wall A1 - Wallenstein, M A1 - Ross A. Virginia A1 - D. W. Hopkins A1 - Aislabie, J A1 - Bargagli, R A1 - Bockheim, J A1 - Campbell, I A1 - W. Berry Lyons A1 - Daryl L. Moorhead VL - 38 ER - TY - JOUR T1 - Comment on ``El NiƱo suppresses Antarctic warming'' by N. Bertler et al. JF - Geophysical Research Letters Y1 - 2005 A1 - Peter T. Doran A1 - Gary D. Clow A1 - Christian H. Fritsen A1 - Christopher P. McKay A1 - Andrew N. Parsons A1 - John C. Priscu A1 - W. Berry Lyons A1 - Walsh, J A1 - Andrew G Fountain A1 - Diane M. McKnight A1 - Daryl L. Moorhead A1 - Ross A. Virginia A1 - Diana H. Wall KW - Tropical meteorology VL - 32 IS - 7 ER - TY - JOUR T1 - Contributions of Benthic Microbial Mats to Net Primary Production in Lake Hoare, Antarctica JF - Antarctic Science Y1 - 2005 A1 - Daryl L. Moorhead A1 - Schmeling, S A1 - Ian Hawes VL - 17 IS - 33-45 ER - TY - JOUR T1 - The impact of anhydrobiosis on the persistence of Scottnema lindsyae (Nematoda): a modeling analysis of population stability thresholds JF - Polar Biology Y1 - 2004 A1 - Weicht, T A1 - Daryl L. Moorhead VL - 27 ER - TY - JOUR T1 - Inorganic nitrogen and phosphorus dynamics of Antarctic glacial meltwater streams as controlled by hyporheic exchange and benthic autotrophic communities JF - Journal of the North American Benthological Society Y1 - 2004 A1 - Diane M. McKnight A1 - Robert L. Runkel A1 - John H. Duff A1 - Cathy M. Tate A1 - Daryl L. Moorhead VL - 23 ER - TY - JOUR T1 - Organic matter and soil biota of upland wetlands in Taylor Valley, Antarctica JF - Polar Biology Y1 - 2003 A1 - Daryl L. Moorhead A1 - John E. Barrett A1 - Ross A. Virginia A1 - Diana H. Wall A1 - Porazinska, D VL - 26 ER - TY - JOUR T1 - Antarctic climate cooling and terrestrial ecosystem response JF - Nature Y1 - 2002 A1 - Peter T. Doran A1 - John C. Priscu A1 - W. Berry Lyons A1 - John E. Walsh A1 - Andrew G Fountain A1 - Diane M. McKnight A1 - Daryl L. Moorhead A1 - Ross A. Virginia A1 - Diana H. Wall A1 - Gary D. Clow A1 - Christian H. Fritsen A1 - Christopher P. McKay A1 - Andrew N. Parsons KW - Climate Response VL - 415 IS - 6871 ER - TY - JOUR T1 - Distribution and life cycle of Scottnema lindsayae (Nematoda) in Antarctic soils: A modeling analysis of tempaerature responses JF - Polar Biology Y1 - 2002 A1 - Daryl L. Moorhead A1 - Diana H. Wall A1 - Ross A. Virginia A1 - Andrew N. Parsons VL - 25 ER - TY - JOUR T1 - Recent Temperature Trends in the Antarctic JF - Nature Y1 - 2002 A1 - John E. Walsh A1 - Gary D. Clow A1 - Christian H. Fritsen A1 - Christopher P. McKay A1 - Andrew N. Parsons A1 - Peter T. Doran A1 - John C. Priscu A1 - W. Berry Lyons A1 - Andrew G Fountain A1 - Diane M. McKnight A1 - Daryl L. Moorhead A1 - Ross A. Virginia A1 - Diana H. Wall VL - 418 ER - TY - JOUR T1 - Benthic primary production in two perennially ice-covered Antarctic lakes: comparisons of annual accumulation predicted from photosynthesis models with estimates from internal growth markers JF - Antarctic Science Y1 - 2001 A1 - Ian Hawes A1 - Daryl L. Moorhead A1 - Sutherland, J A1 - Schmeling, J A1 - Schwartz, A VL - 13 ER - TY - JOUR T1 - The McMurdo Dry Valleys Long-Term Ecological Research Program: new understanding of the biogeochemistry of the Dry Valley lakes: a review. JF - Polar Geography Y1 - 2001 A1 - W. Berry Lyons A1 - Kathleen A. Welch A1 - John C. Priscu A1 - Johanna Laybourn-Parry A1 - Daryl L. Moorhead A1 - Diane M. McKnight A1 - Peter T. Doran A1 - Martyn Tranter VL - 25 ER - TY - THES T1 - Sensitivity of carbon dynamics to changing light availability of benthic microbial mats in Lake Hoare, Antarctica Y1 - 2001 A1 - Schmeling, J PB - University of Toledo VL - M.S. ER - TY - THES T1 - Dynamics of the deep chlorophyll maximum within the lakes of the McMurdo Dry Valleys, Antarctica Y1 - 2000 A1 - Burnett, L PB - University of Toledo VL - M.S. ER - TY - JOUR T1 - Physical controls on the Taylor Valley Ecosystem, Antarctica JF - BioScience Y1 - 1999 A1 - Andrew G Fountain A1 - W. Berry Lyons A1 - Melody B. Burkins A1 - Gayle L. Dana A1 - Peter T. Doran A1 - Karen J. Lewis A1 - Diane M. McKnight A1 - Daryl L. Moorhead A1 - Andrew N. Parsons A1 - John C. Priscu A1 - Diana H. Wall A1 - Robert A. Wharton Jr. A1 - Ross A. Virginia KW - Water availability VL - 49 IS - 12 ER - TY - CHAP T1 - Geochemical Linkages Among Glaciers, Streams, and Lakes Within the Taylor Valley, Antarctica T2 - Ecosystem Processes in a Polar Desert: The McMurdo Dry Valleys, Antarctica Y1 - 1998 A1 - W. Berry Lyons A1 - Kathleen A. Welch A1 - Klaus Neumann A1 - Jeffrey K. Toxey A1 - Robyn McArthur A1 - Changela Williams A1 - Diane M. McKnight A1 - Daryl L. Moorhead JF - Ecosystem Processes in a Polar Desert: The McMurdo Dry Valleys, Antarctica VL - 72 ER - TY - JOUR T1 - The McMurdo Dry Valley Ecosystem: Organization, Controls, and Linkages, in Ecosystem Processes in a Polar Desert: The McMurdo Dry Valleys, Antarctica JF - Antarctic Research Series Y1 - 1998 A1 - Daryl L. Moorhead A1 - John C. Priscu VL - 72 ER - TY - JOUR T1 - McMurdo Dry Valleys LTER: Stream discharge as a function of ambient temperature and incoming shortwave radiation in Taylor Valley, Antarctica JF - Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28) Y1 - 1998 A1 - Daryl L. Moorhead A1 - Diane M. McKnight VL - 31 IS - 2 ER - TY - JOUR T1 - Modeling Nitrogen Transformations in Dry Valley Streams, Antarctica, in Ecosystem Processes in a Polar Desert: The McMurdo Dry Valleys, Antarctica JF - Antarctic Research Series Y1 - 1998 A1 - Daryl L. Moorhead A1 - Diane M. McKnight A1 - Cathy M. Tate VL - 72 ER - TY - THES T1 - Spatial-temporal patterns of primary production in phytoplankton communities of Taylor Valley lakes, Antartica: A modelling synthesis Y1 - 1998 A1 - Davis, W PB - Texas Tech University VL - M.S. ER - TY - CHAP T1 - Carbon dynamics of aquatic microbial mats in the Antarctic dry valleys: A modelling synthesis T2 - Ecosystem Processes in Antarctic Ice-free Landscapes Y1 - 1997 A1 - Daryl L. Moorhead A1 - W. Shane Davis A1 - Robert A. Wharton Jr. JF - Ecosystem Processes in Antarctic Ice-free Landscapes PB - Balkema Press, Rotterdam ER - TY - JOUR T1 - Impact of Light Regimes on Productivity Patterns of Benthic Microbial Mats in an Antarctic Lake: A Modeling Study JF - Limnology and Oceanography Y1 - 1997 A1 - Daryl L. Moorhead A1 - Craig F. Wolf A1 - Robert A. Wharton Jr. VL - 42 IS - 7 ER - TY - JOUR T1 - McMurdo LTER: Primary production model of benthic microbial mats in Lake Hoare, Antarctica JF - Antarctic Journal of the U.S. Y1 - 1994 A1 - Daryl L. Moorhead A1 - Robert A. Wharton Jr. VL - 29 IS - 5 ER -