{"663404":{"#nid":"663404","#data":{"type":"event","title":"MS Defense by Kelton Southard ","body":[{"value":"\u003Cp\u003EIn partial fulfillment of the requirements for the degree of\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u202f\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EMaster of Science in Biology\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003Ein the\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ESchool of Biological Sciences\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u202f\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EKelton Southard\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u202f\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EWill defend his thesis\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u202f\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026ldquo;Nitrate and Phosphate Loads, but not Light Availability, Impact Freshwater Phytoplankton Diversity via Tradeoffs Between Dominant Species\u0026rdquo;\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u202f\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E28, November, 2022\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E3:30PM\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EFord ES\u0026amp;T Room L1116\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Ca href=\u0022https:\/\/gatech.zoom.us\/j\/91321371094\u0022 target=\u0022_blank\u0022\u003Ehttps:\/\/gatech.zoom.us\/j\/91321371094\u003C\/a\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u202f\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EThesis Advisor:\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Lin Jiang\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ESchool of Biological Sciences\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EGeorgia Institute of Technology\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u202f\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Julia Kubanek\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ESchool of Biological Sciences\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EGeorgia Institute of Technology\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u202f\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u202f\u003C\/strong\u003E Dr. Yongsheng Chen\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ESchool of Civil and Environmental Engineering\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EGeorgia Institute of Technology\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u202f\u202f\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract: \u003C\/strong\u003EEutrophication of freshwater ecosystems, mainly caused by nitrogen (N) and phosphorus (P) pollution, causes significant economic damages every year in the U.S. Excess N and P deposition in lakes can result in harmful algal blooms, reduced biodiversity, and increased greenhouse gas production, but we still do not fully understand how and why phytoplankton communities react to nutrient enrichment under varying conditions. Several theories \u0026ndash; including the niche dimension hypothesis, biomass-driven competition hypothesis, nitrogen detriment hypothesis, and benthic model \u0026ndash; are currently being explored in both terrestrial and aquatic producer communities in attempt to better understand the biological mechanisms effecting these systems, and the goal of this study was to determine which models are most applicable to freshwater phytoplankton. Using five-species microcosms of green algae, we found that N and P enrichment significantly reduced diversity (independent of light availability), which was likely mediated through nutrient tradeoffs between the two dominant species, \u003Cem\u003EAnkistrodesmus falcatus\u003C\/em\u003E and \u003Cem\u003ESelenastrum capricornutum\u003C\/em\u003E. Additionally, we observed a significant decrease in monoculture carrying capacity across all species with high N addition in low P concentrations, indicating that high N:P ratios may be physiologically harmful to green algae. These findings suggest that the niche dimension and nitrogen detriment hypotheses may be the most applicable to freshwater phytoplankton communities and could be useful for protecting and mitigating economic losses from these systems.\u0026nbsp;\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"\u201cNitrate and Phosphate Loads, but not Light Availability, Impact Freshwater Phytoplankton Diversity via Tradeoffs Between Dominant Species"}],"uid":"27707","created_gmt":"2022-11-22 16:54:56","changed_gmt":"2022-11-22 16:54:56","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2022-11-28T15:30:00-05:00","event_time_end":"2022-11-28T17:30:00-05:00","event_time_end_last":"2022-11-28T17:30:00-05:00","gmt_time_start":"2022-11-28 20:30:00","gmt_time_end":"2022-11-28 22:30:00","gmt_time_end_last":"2022-11-28 22:30:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"111531","name":"ms defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}