<?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%">Jankowski, Kathi Jo</style></author><author><style face="normal" font="default" size="100%">Johnson, Keira</style></author><author><style face="normal" font="default" size="100%">Sethna, Lienne</style></author><author><style face="normal" font="default" size="100%">Julian, Paul</style></author><author><style face="normal" font="default" size="100%">Wymore, Adam S.</style></author><author><style face="normal" font="default" size="100%">Shogren, Arial J.</style></author><author><style face="normal" font="default" size="100%">Thomas, Patrick K.</style></author><author><style face="normal" font="default" size="100%">Sullivan, Pamela L.</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">McDowell, William H.</style></author><author><style face="normal" font="default" size="100%">Heindel, Ruth C</style></author><author><style face="normal" font="default" size="100%">Jones, Jeremy B.</style></author><author><style face="normal" font="default" size="100%">Wollheim, Wilfred</style></author><author><style face="normal" font="default" size="100%">Abbott, Benjamin</style></author><author><style face="normal" font="default" size="100%">Deegan, Linda</style></author><author><style face="normal" font="default" size="100%">Carey, Joanna C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Long-term changes in concentration and yield of riverine dissolved silicon from the poles to the tropics</style></title><secondary-title><style face="normal" font="default" size="100%">Global Biogeochemical Cycles</style></secondary-title><short-title><style face="normal" font="default" size="100%">Global Biogeochemical Cycles</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">biogeochemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">river</style></keyword><keyword><style  face="normal" font="default" size="100%">silica</style></keyword><keyword><style  face="normal" font="default" size="100%">silicon</style></keyword><keyword><style  face="normal" font="default" size="100%">stream</style></keyword><keyword><style  face="normal" font="default" size="100%">trends</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2023</style></year><pub-dates><date><style  face="normal" font="default" size="100%">08/2023</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022GB007678</style></url></web-urls></urls><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Riverine exports of silicon (Si) influence global carbon cycling through the growth of marine diatoms, which account for &amp;sim;25% of global primary production. Climate change will likely alter river Si exports in biome-specific ways due to interacting shifts in chemical weathering rates, hydrologic connectivity, and metabolic processes in aquatic and terrestrial systems. Nonetheless, factors driving long-term changes in Si exports remain unexplored at local, regional, and global scales. We evaluated how concentrations and yields of dissolved Si (DSi) changed over the last several decades of rapid climate warming using long-term datasets from 60 rivers and streams spanning the globe (e.g., Antarctic, tropical, temperate, boreal, alpine, Arctic systems). We show that widespread changes in river DSi concentration and yield have occurred, with the most substantial shifts occurring in alpine and polar regions. The magnitude and direction of trends varied within and among biomes, were most strongly associated with differences in land cover, and were often independent of changes in river discharge. These findings indicate that there are likely diverse mechanisms driving change in river Si biogeochemistry that span the land-water interface, which may include glacial melt, changes in terrestrial vegetation, and river productivity. Finally, trends were often stronger in months outside of the growing season, particularly in temperate and boreal systems, demonstrating a potentially important role of shifting seasonality for the flux of Si from rivers. Our results have implications for the timing and magnitude of silica processing in rivers and its delivery to global oceans.&lt;/p&gt;</style></abstract></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%">Tyler J. Kohler</style></author><author><style face="normal" font="default" size="100%">Lee F. Stanish</style></author><author><style face="normal" font="default" size="100%">Stenven Crisp</style></author><author><style face="normal" font="default" size="100%">Koch, J.</style></author><author><style face="normal" font="default" size="100%">Liptzin, D.</style></author><author><style face="normal" font="default" size="100%">Baeseman, J.</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%"> Long-Term Hydrologic Control of Microbial Mat Abundance in McMurdo Dry Valley Streams, Antarctica.</style></title><secondary-title><style face="normal" font="default" size="100%">Ecosystems</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2015</style></year><pub-dates><date><style  face="normal" font="default" size="100%">03/2015</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.springer.com/article/10.1007%2Fs10021-014-9829-6</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">18</style></volume><pages><style face="normal" font="default" size="100%">310-327</style></pages><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(51, 51, 51); font-family: 'Helvetica Neue', Arial, Helvetica, sans-serif; font-size: 13px; line-height: 20.8px;&quot;&gt;Given alterations in global hydrologic regime, we examine the role of hydrology in regulating stream microbial mat abundance in the McMurdo Dry Valleys, Antarctica. Here, perennial mats persist as a desiccated crust until revived by summer streamflow, which varies inter-annually, and has increased since the 1990s. We predicted high flows to scour mats, and intra-seasonal drying to slow growth. Responses were hypothesized to differ based on mat location within streams, along with geomorphology, which may promote (high coverage) or discourage (low coverage) accrual. We compared hydrologic trends with the biomass of green and orange mats, which grow in the channel, and black mats growing at stream margins for 16 diverse stream transects over two decades. We found mat biomass collectively decreased during first decade coinciding with low flows, and increased following elevated discharges. Green mat biomass showed the greatest correlations with hydrology and was stimulated by discharge in high coverage transects, but negatively correlated in low coverage due to habitat scour. In contrast, orange mat biomass was negatively related to flow in high coverage transects, but positively correlated in low coverage because of side-channel expansion. Black mats were weakly correlated with all hydrologic variables regardless of coverage. Lastly, model selection indicated the best combination of predictive hydrologic variables for biomass differed between mat types, but also high and low coverage transects. These results demonstrate the importance of geomorphology and species composition to modeling primary production, and will be useful in predicting ecological responses of benthic habitats to altered hydrologic regimes.&lt;/span&gt;&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><section><style face="normal" font="default" size="100%">310</style></section></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>6</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Peter T. Doran</style></author><author><style face="normal" font="default" size="100%">W. Berry Lyons</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">Michael N. Gooseff</style></author><author><style face="normal" font="default" size="100%">Cristina D. Takacs-Vesbach</style></author><author><style face="normal" font="default" size="100%">Jill A. Mikucki</style></author><author><style face="normal" font="default" size="100%">Martyn Tranter</style></author><author><style face="normal" font="default" size="100%">Sun, Henry J</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Life in Antarctic Deserts and Other Cold Environments</style></title><secondary-title><style face="normal" font="default" size="100%">Astrobiological Analogs</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Planetary Science</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://ebooks.cambridge.org/ebook.jsf?bid=CBO9780511712258</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">Cambridge University Press.</style></publisher><pub-location><style face="normal" font="default" size="100%">Cambridge</style></pub-location><volume><style face="normal" font="default" size="100%">5</style></volume><pages><style face="normal" font="default" size="100%">307</style></pages><isbn><style face="normal" font="default" size="100%">9780511712258</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language></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%">Lars J. Tranvik</style></author><author><style face="normal" font="default" size="100%">John A. Downing</style></author><author><style face="normal" font="default" size="100%">James B. Cotner</style></author><author><style face="normal" font="default" size="100%">Steven A. Loiselle</style></author><author><style face="normal" font="default" size="100%">Robert G. Striegl</style></author><author><style face="normal" font="default" size="100%">Thomas J. Ballatore</style></author><author><style face="normal" font="default" size="100%">Peter Dillon</style></author><author><style face="normal" font="default" size="100%">Kerri Finlay</style></author><author><style face="normal" font="default" size="100%">Kenneth Fortino</style></author><author><style face="normal" font="default" size="100%">Lesley B. Knoll</style></author><author><style face="normal" font="default" size="100%">Pirkko L. Kortelainen</style></author><author><style face="normal" font="default" size="100%">Tiit Kutser</style></author><author><style face="normal" font="default" size="100%">Soren Larsen</style></author><author><style face="normal" font="default" size="100%">Isabelle Laurion</style></author><author><style face="normal" font="default" size="100%">Dina M. Leech</style></author><author><style face="normal" font="default" size="100%">S. Leigh McCallister</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">John M. Melack</style></author><author><style face="normal" font="default" size="100%">Erin Overholt</style></author><author><style face="normal" font="default" size="100%">Jason A. Porter</style></author><author><style face="normal" font="default" size="100%">Yves Prairie</style></author><author><style face="normal" font="default" size="100%">William H. Renwick</style></author><author><style face="normal" font="default" size="100%">Fabio Roland</style></author><author><style face="normal" font="default" size="100%">Bradford S. Sherman</style></author><author><style face="normal" font="default" size="100%">David W. Schindler</style></author><author><style face="normal" font="default" size="100%">Sebastian Sobek</style></author><author><style face="normal" font="default" size="100%">Alain Tremblay</style></author><author><style face="normal" font="default" size="100%">Michael J. Vanni</style></author><author><style face="normal" font="default" size="100%">Antonie M. Verschoor</style></author><author><style face="normal" font="default" size="100%">Eddie von Wachenfeldt</style></author><author><style face="normal" font="default" size="100%">Gesa A. Weyhenmeyer</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Lakes and reservoirs as regulators of carbon cycling and climate</style></title><secondary-title><style face="normal" font="default" size="100%">Limnology and Oceanography</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2009</style></year><pub-dates><date><style  face="normal" font="default" size="100%">11/2009</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://aslo.org/lo/toc/vol_54/issue_6_part_2/2298.pdf</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">54 part 2</style></volume><pages><style face="normal" font="default" size="100%">2298–2314</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">6</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>6</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The Lost Seal</style></title></titles><dates><year><style  face="normal" font="default" size="100%">2006</style></year></dates><publisher><style face="normal" font="default" size="100%">Moonlight Publishing LLC</style></publisher><pub-location><style face="normal" font="default" size="100%">Lafayette</style></pub-location><pages><style face="normal" font="default" size="100%">40</style></pages><isbn><style face="normal" font="default" size="100%">978-0972342278</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language></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%">Scott W. Tyler</style></author><author><style face="normal" font="default" size="100%">Robert A. Wharton Jr.</style></author><author><style face="normal" font="default" size="100%">Diane M. McKnight</style></author><author><style face="normal" font="default" size="100%">Bruce H. Vaughn</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A late holocene dessication of Lake Hoare and Lake Fryxell, McMurdo Dry Valleys, Antarctica</style></title><secondary-title><style face="normal" font="default" size="100%">Antarctic Science</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%">10</style></volume><pages><style face="normal" font="default" size="100%">247-256</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">3</style></issue><accession-num><style face="normal" font="default" size="100%">LTER12883</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%">Alexander S. Alger</style></author><author><style face="normal" font="default" size="100%">Cathy M. Tate</style></author><author><style face="normal" font="default" size="100%">Gordon H Shupe</style></author><author><style face="normal" font="default" size="100%">Sarah A. Spaulding</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Longitudinal Patterns in Algal Abundance and Species Distribution in Meltwater Streams in Taylor Valley, Southern Victoria Land, 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%">109-127</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER12898</style></accession-num></record></records></xml>