<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><img apple-inline="yes" id="908E2BA3-0C21-4BC6-8E88-6A783FDB4BCE" class="" style="font-size: 14px;" src="cid:35AD16B5-5C20-4F2C-BCD3-8BAC0F72CAFB@hsd1.ca.comcast.net."><div class=""><p class="MsoNormal" style="line-height: 13.800000190734863px;"><span class="" style="line-height: 16.100000381469727px; font-size: 14px;">Dear all,<o:p class=""></o:p></span></p><p class="MsoNormal" style="line-height: 13.800000190734863px;"><span class="" style="line-height: 16.100000381469727px; font-size: 14px;">Please join us tomorrow for our speaker, Dr. Jesse Wilson from UC Merced. <o:p class=""></o:p></span></p><p class="MsoNormal" align="center" style="text-align: center; line-height: 13.800000190734863px;"><b class=""><span class="" style="line-height: 16.100000381469727px; font-size: 14px;"> </span></b></p><p class="MsoNormal" align="center" style="text-align: center;"><b class="" style="font-size: 14px;">Jesse Wilson<o:p class=""></o:p></b></p><p class="MsoNormal" align="center" style="text-align: center;"><span class="" style="font-size: 14px;">Environmental systems, UC Merced<o:p class=""></o:p></span></p><div style="text-align: center;" class=""><span class="" style="font-size: 14px;"> </span><br class="webkit-block-placeholder"></div><p class="MsoNormal"><b class="" style="font-size: 14px;">Complex microbial community interactions control carbon cycling along natural and experimental carbon and nutrient gradients in marine lakes<o:p class=""></o:p></b></p><p class="MsoNormal"><b class="" style="font-size: 14px;"> </b></p><p class="Paragraph" style="text-indent: 0in; line-height: 13.800000190734863px;"><span class="" style="font-size: 14px;"><b class="">Abstract</b><span class="" style="line-height: 16.100000381469727px;">: Collective interactions within microbial communities drive biogeochemical cycling of carbon (C) and nitrogen (N) but remain poorly understood: are biogeochemical shifts driven by a few keystone taxa, for instance, or do complex changes in community composition, diversity, and function occur? We assessed microbial communities and C-cycling rates across marine lakes in Palau—a natural experimental system with lakes differing in nutrient enrichment and stratification—and in experimental incubations. Multivariate analyses showed that low nutrient, unstratified lake communities (assessed via 16S rRNA gene sequencing) were similar, whereas stratified lakes differed from unstratified lakes and each other. Metabolic rates were higher in stratified lakes, and the lake with the shallowest chemocline (nutrients closest to the surface) possessed the highest rates of community respiration (CR) and gross primary production (GPP). We performed experimental additions to identify key factors for C cycling groups and their responses to changing C and N; we found that incubations changed communities in a similar manner across lakes (e.g. <i class="">Pseudoalteromonas</i> increased), but communities remained clustered according to stratification. Net autotrophy was correlated with increased levels of Synechococcus, and N addition often increased Synechococcus. N and C co-additions caused the greatest community shifts and also drove metabolic shifts from autotrophy to heterotrophy. While addition of C alone never increased CR to the same degree, C additions resulted in communities that clustered with communities from N and C co-additions. Network analysis identified changes in community structure associated with high CR and GPP (usually stimulated by N and C co-addition). Collectively these results suggest that changes in C-cycling rates are accompanied by underlying shifts in microbial interactions, including rapid responses in key taxa, as well as overall modification of microbial network structure.<o:p class=""></o:p></span></span></p><div class=""><span class="" style="font-size: 14px;"> </span><br class="webkit-block-placeholder"></div><p class="MsoNormal"><span class="" style="font-size: 14px;">When: Oct. 19<sup class="">th</sup>,<sup class=""> </sup>Thursday, 12pm – 1pm<o:p class=""></o:p></span></p><p class="MsoNormal"><span class="" style="font-size: 14px;">Where: SE2-302 <o:p class=""></o:p></span></p><div class=""><span class="" style="font-size: 14px;"> </span><br class="webkit-block-placeholder"></div><p class="MsoNormal"><span class="" style="font-size: 14px;">Coffee will be provided and please bring your own mugs.<o:p class=""></o:p></span></p><p class="MsoNormal"><span class="" style="font-size: 14px;">We look forward to seeing you,<o:p class=""></o:p></span></p><div class=""><span class="" style="font-size: 14px;"> </span><br class="webkit-block-placeholder"></div><p class="MsoNormal"><span class="" style="font-size: 14px;">Organizers for 2017-18: Nate Bogie and Lixia Jin<o:p class=""></o:p></span></p><p class="MsoNormal"><span class="" style="font-size: 14px;">Faculty coordinator: Asmeret Asefaw Berhe</span></p></div></body></html>