02449nas a2200169 4500008004100000245008400041210006900125260001200194490000700206520189300213100003002106700002102136700002202157700001502179700002302194856006202217 2019 eng d00aIn a PICL: The sedimentary deposits and facies of perennially ice-covered lakes0 aIn a PICL The sedimentary deposits and facies of perennially ice c04/20190 v663 a
Perennially ice‐covered lakes can have significantly different facies than open‐water lakes because sediment is transported onto the ice, where it accumulates, and sand grains preferentially melt through to be deposited on the lake floor. To characterize the facies in these lakes, sedimentary deposits from five Antarctic perennially ice‐covered lakes were described using lake‐bottom observations, underwater video and images, and sediment cores. One lake was dominated by laminated microbial mats and mud (derived from an abutting glacier), with disseminated sand and rare gravel. The other four lakes were dominated by laminated microbial mats and moderately well to moderately sorted medium to very coarse sand with sparse granules and pebbles; they contained minor interstitial or laminated mud (derived from streams and abutting glaciers). The sand was disseminated or localized in mounds and 1 m to more than 10 m long elongate ridges. Mounds were centimetres to metres in diameter; conical, elongate or round in shape; and isolated or deposited near or on top of one another. Sand layers in the mounds had normal, inverse, or no grading. Nine mixed mud and sand facies were defined for perennially ice‐covered lakes based on the relative proportion of mud to sand and the style of sand deposition. While perennially ice‐covered lake facies overlap with other ice‐influenced lakes and glaciomarine facies, they are characterized by a paucity of grains coarser than granules, a narrow range in sand grain sizes, and inverse grading in the sand mounds. These facies can be used to infer changes in ice cover through time and to identify perennially ice‐covered lakes in the rock record. Ancient perennially ice‐covered lakes are expected on Earth and Mars, and their characterization will provide new insights into past climatic conditions and habitability.
1 aRivera-Hernandez, Frances1 aSumner, Dawn, Y.1 aMackey, Tyler, J.1 aHawes, Ian1 aAndersen, Dale, T. uhttps://onlinelibrary.wiley.com/doi/abs/10.1111/sed.1252203959nas a2200205 4500008004100000022001400041245008900055210006900144260001200213300001600225490000700241520327000248100001403518700002303532700001503555700002303570700002103593700002203614856011703636 2015 eng d a0722-406000aCyanobacterial diversity in benthic mats of the McMurdo Dry Valley lakes, Antarctica0 aCyanobacterial diversity in benthic mats of the McMurdo Dry Vall c01/2015 a1097 - 11100 v383 aPerennially ice-covered, meromictic lakes in the McMurdo Dry Valleys, Antarctica, are useful models to study the relationship between cyanobacterial and environmental variables. They have rich benthic cyanobacterial mat accumulations and stable stratification of physical and chemical conditions. Here, we evaluated cyanobacteria from benthic mats from multiple depths in three geographically separated ice-covered lakes, Lakes Vanda, Hoare and Joyce, using 16S rRNA gene clone libraries. We identified 19 ribotypes, mostly Oscillatoriales and several
Chroococcales, as well as potentially novel cyanobacterial ribotypes. The majority of ribotype diversity was shared between lakes, and only a weak relationship between ribotype community structure and environmental variables was evident. Multivariate analysis of all lake–depth combinations implied that photosynthetically active radiation, dissolved reactive phosphorus and conductivity were potentially important for shaping benthic communities in McMurdo Dry Valley lakes. Cyanobacterial-specific pigment signature analysis by high-performance liquid chromatography
showed that the cyanobacterial communities responded to light conditions similarly, irrespective of community composition. The results imply a capability within a suite of cyanobacteria to colonise, adapt and grow across broad environmental ranges and geographic space, and such adaptability may provide a high degree of community resistance and resilience to future climate-driven environmental change in Antarctic terrestrial aquatic
ecosystems.
1 aZhang, L.1 aJungblut, Anne, D.1 aHawes, Ian1 aAndersen, Dale, T.1 aSumner, Dawn, Y.1 aMackey, Tyler, J. uhttp://link.springer.com/10.1007/s00300-015-1669-0http://link.springer.com/content/pdf/10.1007/s00300-015-1669-000685nas a2200205 4500008004100000245010300041210006900144260000900213490000700222100002300229700002300252700002900275700001500304700002300319700002100342700001500363700001500378700002500393856006100418 2008 eng d00aReply to comment by K. Gajewski on “Abrupt environmental change in Canada's northernmost lake”0 aReply to comment by K Gajewski on Abrupt environmental change in c20080 v351 aAntoniades, Dermot1 aCrawley, Catherine1 aDouglas, Marianne, S. V.1 aPienitz, R1 aAndersen, Dale, T.1 aDoran, Peter, T.1 aHawes, Ian1 aPollard, W1 aVincent, Warwick, F. uhttp://www.agu.org/pubs/crossref/2008/2007GL032889.shtml00662nas a2200193 4500008004100000245008500041210006900126260004000195300001200235100002700247700002300274700001500297700001600312700002100328700002700349700002100376700002000397856005100417 2005 eng d00aPolar lakes, streams, and springs as analogs for the hydrological cycle on Mars.0 aPolar lakes streams and springs as analogs for the hydrological aBerlin, HeidelbergbSpringer Verlag a219-2331 aMcKay, Christopher, P.1 aAndersen, Dale, T.1 aPollard, W1 aHeldmann, J1 aDoran, Peter, T.1 aFritsen, Christian, H.1 aPriscu, John, C.1 aTokano, Tetsuya u/reports/lakes/McKayEtAl2005StreamsSprings.pdf00791nas a2200217 4500008004100000020002200041245008200063210006900145260005900214300001200273100002100285700002100306700001700327700001400344700002300358700002300381700001500404700002900419700001500448856011000463 2004 eng d a978-1-4020-2125-100aPaleolimnology of extreme cold terrestrial and extraterrestrial environments.0 aPaleolimnology of extreme cold terrestrial and extraterrestrial aDordrecht, The NetherlandsbKluwer Academic Publishers a475-5071 aDoran, Peter, T.1 aPriscu, John, C.1 aLyons, Berry1 aPowell, R1 aPoreda, Robert, J.1 aAndersen, Dale, T.1 aPienitz, R1 aDouglas, Marianne, S. V.1 aSmol, J.P. uhttps://mcm.lternet.edu/content/paleolimnology-extreme-cold-terrestrial-and-extraterrestrial-environments00706nas a2200169 4500008004100000245014800041210006900189300001000258490000700268100002400275700002500299700002500324700002100349700001800370700002300388856012500411 2001 eng d00aSpectrofluorometric characterization of aquatic fulvic acid for determination of precursor organic material and general structural properties.0 aSpectrofluorometric characterization of aquatic fulvic acid for a38-480 v461 aMcKnight, Diane, M.1 aBoyer, Elizabeth, W.1 aWesterhoff, Paul, K.1 aDoran, Peter, T.1 aKulbe, Thomas1 aAndersen, Dale, T. uhttps://mcm.lternet.edu/content/spectrofluorometric-characterization-aquatic-fulvic-acid-determination-precursor-organic00521nas a2200145 4500008004100000245006200041210006200103100001700165700001600182700002400198700002100222700002300243700002300266856008600289 1999 eng d00aEffects of research diving on a stratified antarctic lake0 aEffects of research diving on a stratified antarctic lake1 aKepner, R.L.1 aKortyna, A.1 aWharton, Robert, A.1 aDoran, Peter, T.1 aAndersen, Dale, T.1 aRoberts, Emily, C. uhttps://mcm.lternet.edu/content/effects-research-diving-stratified-antarctic-lake00542nas a2200133 4500008004100000245009200041210006900133300001200202490000700214100002300221700002700244700002400271856011300295 1998 eng d00aDissolved gases in perennially ice-covered lakes of the McMurdo Dry Valleys, Antarctica0 aDissolved gases in perennially icecovered lakes of the McMurdo D a124-1330 v101 aAndersen, Dale, T.1 aMcKay, Christopher, P.1 aWharton, Robert, A. uhttps://mcm.lternet.edu/content/dissolved-gases-perennially-ice-covered-lakes-mcmurdo-dry-valleys-antarctica00741nas a2200193 4500008004100000245014600041210006900187300001200256490000700268100002300275700001500298700001500313700001600328700002000344700002300364700001800387700002400405856011800429 1996 eng d00aReflectance spectroscopy and geochemical analyses of Lake Hoare sediments, Antarctica: Implications for remote sensing of the Earth and Mars0 aReflectance spectroscopy and geochemical analyses of Lake Hoare a765-7850 v601 aBishop, Janice, L.1 aKoeberl, C1 aKralik, C.1 aFroschl, H.1 aEnglert, P.A.J.1 aAndersen, Dale, T.1 aPieters, C.M.1 aWharton, Robert, A. uhttps://mcm.lternet.edu/content/reflectance-spectroscopy-and-geochemical-analyses-lake-hoare-sediments-antarctica00600nas a2200157 4500008004100000245008800041210006900129260001200198300001600210490000700226100002700233700001900260700002300279700002400302856011600326 1994 eng d00aLight transmission and reflection in perennially ice-covered Lake Hoare, Antarctica0 aLight transmission and reflection in perennially icecovered Lake c06/1994 a20427-204440 v991 aMcKay, Christopher, P.1 aClow, Gary, D.1 aAndersen, Dale, T.1 aWharton, Robert, A. uhttps://mcm.lternet.edu/content/light-transmission-and-reflection-perennially-ice-covered-lake-hoare-antarctica00617nas a2200145 4500008004100000245013500041210006900176300001000245490000700255100002400262700002700286700001900313700002300332856011600355 1993 eng d00aPerennial ice covers and their influence on antarctic lake ecosystems, in Physical and Biogeochemical Processes in Antarctic Lakes0 aPerennial ice covers and their influence on antarctic lake ecosy a53-700 v591 aWharton, Robert, A.1 aMcKay, Christopher, P.1 aClow, Gary, D.1 aAndersen, Dale, T. uhttps://mcm.lternet.edu/content/perennial-ice-covers-and-their-influence-antarctic-lake-ecosystems-physical-and