<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Christine M. Foreman</style></author><author><style face="normal" font="default" size="100%">Rose M. Cory</style></author><author><style face="normal" font="default" size="100%">Morris, Cindy E</style></author><author><style face="normal" font="default" size="100%">Michael D. SanClements</style></author><author><style face="normal" font="default" size="100%">Smith, Heidi J</style></author><author><style face="normal" font="default" size="100%">John T. Lisle</style></author><author><style face="normal" font="default" size="100%">Penney L. Miller</style></author><author><style face="normal" font="default" size="100%">Yu-Ping Chin</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica</style></title><secondary-title><style face="normal" font="default" size="100%">Environmental Research Letters</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2013</style></year><pub-dates><date><style  face="normal" font="default" size="100%">09/2013</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://iopscience.iop.org/1748-9326/8/3/035022</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">8</style></volume><pages><style face="normal" font="default" size="100%">035022</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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 (44–48 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 × 104 to 4.97 × 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.</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">A. E. Murray</style></author><author><style face="normal" font="default" size="100%">Kenig, Fabien</style></author><author><style face="normal" font="default" size="100%">Christian H. Fritsen</style></author><author><style face="normal" font="default" size="100%">Christopher P. McKay</style></author><author><style face="normal" font="default" size="100%">Kaelin M. Cawley</style></author><author><style face="normal" font="default" size="100%">R. L. Edwards</style></author><author><style face="normal" font="default" size="100%">Kuhn, Emanuele</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">Nathaniel E Ostrom</style></author><author><style face="normal" font="default" size="100%">Vivian Peng</style></author><author><style face="normal" font="default" size="100%">Adrian Ponce</style></author><author><style face="normal" font="default" size="100%">John C. Priscu</style></author><author><style face="normal" font="default" size="100%">Samarkin, Vladimir A.</style></author><author><style face="normal" font="default" size="100%">Ashley T Townsend</style></author><author><style face="normal" font="default" size="100%">Protima Wagh</style></author><author><style face="normal" font="default" size="100%">Seth A Young</style></author><author><style face="normal" font="default" size="100%">Pung To Yung</style></author><author><style face="normal" font="default" size="100%">Peter T. Doran</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Microbial life at -13  C in the brine of an ice-sealed Antarctic lake</style></title><secondary-title><style face="normal" font="default" size="100%">Proceedings of the National Academy of Sciences</style></secondary-title><short-title><style face="normal" font="default" size="100%">Proceedings of the National Academy of Sciences</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">12/2012</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.pnas.org/cgi/doi/10.1073/pnas.1208607109</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">109</style></volume><pages><style face="normal" font="default" size="100%">20626 - 20631</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">50</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>32</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Cawley, K</style></author></authors><tertiary-authors><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author></tertiary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Microbial interactions with dissolved organic matter in  saline natural waters</style></title></titles><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><publisher><style face="normal" font="default" size="100%">University of Colorado</style></publisher><language><style face="normal" font="default" size="100%">eng</style></language><work-type><style face="normal" font="default" size="100%">doctoral</style></work-type></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">W. Berry Lyons</style></author><author><style face="normal" font="default" size="100%">Kathleen A. Welch</style></author><author><style face="normal" font="default" size="100%">John C. Priscu</style></author><author><style face="normal" font="default" size="100%">Johanna Laybourn-Parry</style></author><author><style face="normal" font="default" size="100%">Daryl L. Moorhead</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">Peter T. Doran</style></author><author><style face="normal" font="default" size="100%">Martyn Tranter</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The McMurdo Dry Valleys Long-Term Ecological Research Program: new understanding of the biogeochemistry of the  Dry Valley lakes: a review.</style></title><secondary-title><style face="normal" font="default" size="100%">Polar Geography</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2001</style></year></dates><volume><style face="normal" font="default" size="100%">25</style></volume><pages><style face="normal" font="default" size="100%">202-217</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER49832</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>32</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Michael N. Gooseff</style></author></authors><tertiary-authors><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author></tertiary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Modeling hyporheic exchange influences on biogeochemical processes in dry valley streams, Antarctica</style></title><secondary-title><style face="normal" font="default" size="100%">Institute of Arctic and Alpine Research</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2001</style></year></dates><publisher><style face="normal" font="default" size="100%">University of Colorado</style></publisher><volume><style face="normal" font="default" size="100%">Ph.D.</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;&lt;span style=&quot;color: rgb(63, 67, 76); font-family: HelveticaNeue, depot-new-condensed-web, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; line-height: 22.4px;&quot;&gt;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 NO&lt;/span&gt;&lt;span style=&quot;font-size: 10.5px; line-height: 0; position: relative; bottom: -0.25em; color: rgb(63, 67, 76); font-family: HelveticaNeue, depot-new-condensed-web, 'Helvetica Neue', Helvetica, Arial, sans-serif;&quot;&gt;2&lt;/span&gt;&lt;span style=&quot;color: rgb(63, 67, 76); font-family: HelveticaNeue, depot-new-condensed-web, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; line-height: 22.4px;&quot;&gt;&amp;nbsp;to N&lt;/span&gt;&lt;span style=&quot;font-size: 10.5px; line-height: 0; position: relative; bottom: -0.25em; color: rgb(63, 67, 76); font-family: HelveticaNeue, depot-new-condensed-web, 'Helvetica Neue', Helvetica, Arial, sans-serif;&quot;&gt;2&lt;/span&gt;&lt;span style=&quot;color: rgb(63, 67, 76); font-family: HelveticaNeue, depot-new-condensed-web, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; line-height: 22.4px;&quot;&gt;O, while the conversion of NO&lt;/span&gt;&lt;span style=&quot;font-size: 10.5px; line-height: 0; position: relative; bottom: -0.25em; color: rgb(63, 67, 76); font-family: HelveticaNeue, depot-new-condensed-web, 'Helvetica Neue', Helvetica, Arial, sans-serif;&quot;&gt;3&lt;/span&gt;&lt;span style=&quot;color: rgb(63, 67, 76); font-family: HelveticaNeue, depot-new-condensed-web, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; line-height: 22.4px;&quot;&gt;&amp;nbsp;to NO&lt;/span&gt;&lt;span style=&quot;font-size: 10.5px; line-height: 0; position: relative; bottom: -0.25em; color: rgb(63, 67, 76); font-family: HelveticaNeue, depot-new-condensed-web, 'Helvetica Neue', Helvetica, Arial, sans-serif;&quot;&gt;2&lt;/span&gt;&lt;span style=&quot;color: rgb(63, 67, 76); font-family: HelveticaNeue, depot-new-condensed-web, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; line-height: 22.4px;&quot;&gt;&amp;nbsp;occurs very quickly.&lt;/span&gt;&lt;/p&gt;</style></abstract><work-type><style face="normal" font="default" size="100%">doctoral</style></work-type></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Daryl L. Moorhead</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">McMurdo Dry Valleys LTER:  Stream discharge as a function of ambient temperature and incoming shortwave radiation in Taylor Valley, Antarctica</style></title><secondary-title><style face="normal" font="default" size="100%">Antarctic Journal of the United States - 1996 Review Issue (NSF 98-28)</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1998</style></year></dates><volume><style face="normal" font="default" size="100%">31</style></volume><pages><style face="normal" font="default" size="100%">196-197</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">2</style></issue><accession-num><style face="normal" font="default" size="100%">LTER12904</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Vandal, G.M.</style></author><author><style face="normal" font="default" size="100%">R.P. Mason</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">W. Fitzgerald</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Mercury speciation and distribution in a polar desert lake (Lake Hoare, Antarctica) and two glacial meltwater streams</style></title><secondary-title><style face="normal" font="default" size="100%">Science of the Total Environment</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1998</style></year></dates><volume><style face="normal" font="default" size="100%">213</style></volume><pages><style face="normal" font="default" size="100%">229-237</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">1-3</style></issue><accession-num><style face="normal" font="default" size="100%">LTER12969</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Daryl L. Moorhead</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">Cathy M. Tate</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Modeling Nitrogen Transformations in Dry Valley Streams, Antarctica, in Ecosystem Processes in a Polar Desert: The McMurdo Dry Valleys, Antarctica</style></title><secondary-title><style face="normal" font="default" size="100%">Antarctic Research Series</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1998</style></year></dates><volume><style face="normal" font="default" size="100%">72</style></volume><pages><style face="normal" font="default" size="100%">141-151</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER12905</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Johanna Laybourn-Parry</style></author><author><style face="normal" font="default" size="100%">Mark R. James</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">John C. Priscu</style></author><author><style face="normal" font="default" size="100%">Sarah A. Spaulding</style></author><author><style face="normal" font="default" size="100%">Russell Shiel</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The microbial plankton of Lake Fryxell, southern Victoria Land, Antarctica during the summers of 1992 and 1994</style></title><secondary-title><style face="normal" font="default" size="100%">Polar Biology</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1997</style></year></dates><volume><style face="normal" font="default" size="100%">17</style></volume><pages><style face="normal" font="default" size="100%">54-61</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER12869</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">Cathy M. Tate</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">McMurdo LTER: Algal mat distribution in glacial meltwater streams in Taylor Valley, southern Victoria Land, Antarctica</style></title><secondary-title><style face="normal" font="default" size="100%">Antarctic Journal of the United States</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1995</style></year></dates><volume><style face="normal" font="default" size="100%">30</style></volume><pages><style face="normal" font="default" size="100%">287-289</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">5</style></issue><accession-num><style face="normal" font="default" size="100%">LTER12896</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Alexander S. Alger</style></author><author><style face="normal" font="default" size="100%">Sarah A. Spaulding</style></author><author><style face="normal" font="default" size="100%">Gordon H Shupe</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">McMurdo LTER: Species composition and spatial distribution of algal mats in Green Creek, Taylor Valley, Antarctica</style></title><secondary-title><style face="normal" font="default" size="100%">Antarctic Journal of the U. S.</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1995</style></year></dates><volume><style face="normal" font="default" size="100%">30</style></volume><pages><style face="normal" font="default" size="100%">289-291</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">5</style></issue><accession-num><style face="normal" font="default" size="100%">LTER12783</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kathleen A. Welch</style></author><author><style face="normal" font="default" size="100%">W. Berry Lyons</style></author><author><style face="normal" font="default" size="100%">John C. Priscu</style></author><author><style face="normal" font="default" size="100%">R. L. Edwards</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">Harold R. House</style></author><author><style face="normal" font="default" size="100%">Robert A. Wharton Jr.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">McMurdo LTER: Inorganic geochemical studies with special reference to calcium carbonate dynamics</style></title><secondary-title><style face="normal" font="default" size="100%">Antarctic Journal of the U.S.</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1994</style></year></dates><volume><style face="normal" font="default" size="100%">29</style></volume><pages><style face="normal" font="default" size="100%">237-239</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">5</style></issue><accession-num><style face="normal" font="default" size="100%">LTER12981</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">Harold R. House</style></author><author><style face="normal" font="default" size="100%">Paul Von Gerard</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">McMurdo LTER: Streamflow Measurements in Taylor Valley</style></title><secondary-title><style face="normal" font="default" size="100%">Antarctic Journal of the United States</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1994</style></year></dates><volume><style face="normal" font="default" size="100%">29</style></volume><pages><style face="normal" font="default" size="100%">230-232</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">5</style></issue><accession-num><style face="normal" font="default" size="100%">LTER12895</style></accession-num></record></records></xml>