{"689244":{"#nid":"689244","#data":{"type":"event","title":"MS Defense by Elijah Harrison","body":[{"value":"\u003Cp\u003EIn partial fulfillment of the requirements for the degree of\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EMaster of Science in Biology\u003C\/p\u003E\u003Cp\u003Ein the\u003C\/p\u003E\u003Cp\u003ESchool of Biological Sciences\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EElijah Harrison\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EWill defend his\u0026nbsp; thesis\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u201cPelagic \u003C\/strong\u003E\u003Cem\u003E\u003Cstrong\u003ESargassum\u003C\/strong\u003E\u003C\/em\u003E\u003Cstrong\u003E in the Western Tropical North Atlantic\u201d\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EApril 13th 2026\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E9:00 AM\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/www.google.com\/url?q=https:\/\/us05web.zoom.us\/j\/2211521813?pwd%3D72tXmkQCSzs1VwZr5w4xbYxqasJgaC.1%26omn%3D82170664459\u0026amp;sa=D\u0026amp;source=calendar\u0026amp;usd=2\u0026amp;usg=AOvVaw3ZZPzsxwNelj1Fr_JRLnMm\u0022 target=\u0022_blank\u0022\u003Ehttps:\/\/us05web.zoom.us\/j\/2211521813?pwd=72tXmkQCSzs1VwZr5w4xbYxqasJgaC.1\u0026amp;omn=82170664459\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EMeeting ID: 221 152 1813 (Passcode will be shared the day of)\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EThesis Advisor:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDr. Joseph Montoya\u003C\/p\u003E\u003Cp\u003ESchool of Biological Sciences\u003C\/p\u003E\u003Cp\u003EGeorgia Institute of Technology\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDr. Mark Hay\u003C\/p\u003E\u003Cp\u003ESchool of Biological Sciences\u003C\/p\u003E\u003Cp\u003EGeorgia Institute of Technology\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003EDr. Martial Taillefert\u003C\/p\u003E\u003Cp\u003ESchool of Earth and Atmospheric Sciences\u003C\/p\u003E\u003Cp\u003EGeorgia Institute of Technology\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAbstract:\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EPelagic \u003Cem\u003ESargassum\u003C\/em\u003E forms extensive mats across the North Atlantic in what is called the Great Atlantic \u003Cem\u003ESargassum\u003C\/em\u003E Belt and causes large scale ecosystem and economic damage through recurring coastal inundations. While the Amazon River Plume (ARP) has been implicated as a major nutrient source supporting Sargassum proliferation, its effects on elemental content and stoichiometry in different \u003Cem\u003ESargassum\u003C\/em\u003E morphotypes, habitats, and at different times remain poorly understood. In this study, we quantify carbon (C), nitrogen (N), and phosphorus (P) content and their molar ratios in \u003Cem\u003ESargassum natans I, Sargassum natans VIII\u0026nbsp;\u003C\/em\u003Eand \u003Cem\u003ESargassum fluitans III\u003C\/em\u003E collected across spatial and temporal gradients within and outside of the ARP during three summer research cruises (EN614, EN640, M174).\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; Elemental analyses were conducted using isotope ratio mass spectrometry for C and N and flow injection analysis following persulfate digestion for total phosphorus. Nitrogen and phosphorus content showed high variation among phytoplanktonic habitats, cruises and morphotypes. In contrast, carbon content showed comparatively low variability across space, time, and morphotype. Comparison with previously published datasets indicates stronger phosphorus limitation of \u003Cem\u003ESargassum\u0026nbsp;\u003C\/em\u003Eis more phosphorus-limited than previously thought, both within the ARP and in oceanic waters. C:P and N:P ratios well above Redfield proportions reflect phosphorus limitation while high C:N ratios indicate that nitrogen may act as a sequentially limiting nutrient. Morphotypic comparisons suggest that \u003Cem\u003ES. natans VIII\u003C\/em\u003E and \u003Cem\u003ES. fluitans III\u003C\/em\u003E generally exhibited higher nitrogen and phosphorus content than \u003Cem\u003ES. natans I, \u003C\/em\u003Ewhile samples collected from subtropical North Atlantic waters suggested greater nutrient efficiency in \u003Cem\u003ES. natans I\u003C\/em\u003E under increasingly oligotrophic conditions.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003EPelagic \u003C\/strong\u003E\u003Cem\u003E\u003Cstrong\u003ESargassum\u003C\/strong\u003E\u003C\/em\u003E\u003Cstrong\u003E in the Western Tropical North Atlantic\u003C\/strong\u003E\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Pelagic Sargassum in the Western Tropical North Atlantic"}],"uid":"27707","created_gmt":"2026-03-30 18:41:58","changed_gmt":"2026-03-31 19:59:33","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2026-04-13T09:00:16-04:00","event_time_end":"2026-04-13T11:00:00-04:00","event_time_end_last":"2026-04-13T11:00:00-04:00","gmt_time_start":"2026-04-13 13:00:16","gmt_time_end":"2026-04-13 15:00:00","gmt_time_end_last":"2026-04-13 15:00:00","rrule":null,"timezone":"America\/New_York"},"location":"Ocean Room (Ford 3243)","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":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}