<?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%">Shaw, E. Ashley</style></author><author><style face="normal" font="default" size="100%">Diana H. Wall</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Biotic interactions in experimental Antarctic soil microcosms vary with abiotic stress</style></title><secondary-title><style face="normal" font="default" size="100%">Soil Systems</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">bacteria</style></keyword><keyword><style  face="normal" font="default" size="100%">biological interactions</style></keyword><keyword><style  face="normal" font="default" size="100%">desert</style></keyword><keyword><style  face="normal" font="default" size="100%">nematode</style></keyword><keyword><style  face="normal" font="default" size="100%">polar</style></keyword><keyword><style  face="normal" font="default" size="100%">soil communities</style></keyword><keyword><style  face="normal" font="default" size="100%">top-down effects</style></keyword><keyword><style  face="normal" font="default" size="100%">trophic interactions</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2019</style></year><pub-dates><date><style  face="normal" font="default" size="100%">08/2019</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.mdpi.com/2571-8789/3/3/57</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">3</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Biotic interactions structure ecological communities but abiotic factors affect the strength of these relationships. These interactions are difficult to study in soils due to their vast biodiversity and the many environmental factors that affect soil species. The McMurdo Dry Valleys (MDV), Antarctica, are relatively simple soil ecosystems compared to temperate soils, making them an excellent study system for the trophic relationships of soil. Soil microbes and relatively few species of nematodes, rotifers, tardigrades, springtails, and mites are patchily distributed across the cold, dry landscape, which lacks vascular plants and terrestrial vertebrates. However, glacier and permafrost melt are expected to cause shifts in soil moisture and solutes across this ecosystem. To test how increased moisture and salinity affect soil invertebrates and their biotic interactions, we established a laboratory microcosm experiment (4 community &amp;times; 2 moisture &amp;times; 2 salinity treatments). Community treatments were: (1) Bacteria only (control), (2) Scottnema (&lt;em&gt;S. lindsayae&lt;/em&gt; + bacteria), (3) Eudorylaimus (&lt;em&gt;E. antarcticus&lt;/em&gt; + bacteria), and (4) Mixed (&lt;em&gt;S. lindsayae&lt;/em&gt; + &lt;em&gt;E. antarcticus&lt;/em&gt; + bacteria). Salinity and moisture treatments were control and high. High moisture reduced &lt;em&gt;S. lindsayae&lt;/em&gt; adults, while high salinity reduced the total &lt;em&gt;S. lindsayae&lt;/em&gt; population. We found that &lt;em&gt;S. lindsayae&lt;/em&gt; exerted top-down control over soil bacteria populations, but this effect was dependent on salinity treatment. In the high salinity treatment, bacteria were released from top-down pressure as &lt;em&gt;S. lindsayae&lt;/em&gt; declined. Ours was the first study to empirically demonstrate, although in lab microcosm conditions, top-down control in the MDV soil food web.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue></record></records></xml>