{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/151509"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/151509","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"A Microbial Survey of Lake Kivu: Mechanisms of Nitrogen Cycling","abstract":"Ocean Anoxic Events (OAEs) are periods in Earth’s history during which large por-tions of the oceans contain decreased amounts of oxygen. OAEs can be very difficult to study since modern oceans are generally well-oxygenated. Here Lake Kivu, a meromictic lake with deep anoxic layers, is presented as a potential OAE analogue and is used to study a proposed nitrogen cycling mechanism that could explain the characteristic 𝛿¹⁵N excursions associated with OAEs. Biomarkers are isolated from sediment samples and analyzed across depth below the lake floor. The results are consistent with a biologically mediated nitrogen cycling mechanism, shedding more light on a potential mechanism to explain nitrogen cycling in OAEs.","abstract_html":"Ocean Anoxic Events (OAEs) are periods in Earth’s history during which large por-tions of the oceans contain decreased amounts of oxygen. OAEs can be very difficult to study since modern oceans are generally well-oxygenated. Here Lake Kivu, a meromictic lake with deep anoxic layers, is presented as a potential OAE analogue and is used to study a proposed nitrogen cycling mechanism that could explain the characteristic 𝛿¹⁵N excursions associated with OAEs. Biomarkers are isolated from sediment samples and analyzed across depth below the lake floor. The results are consistent with a biologically mediated nitrogen cycling mechanism, shedding more light on a potential mechanism to explain nitrogen cycling in OAEs.","abstract_has_math":false,"creators":["Przydzial, Kaitlyn"],"institution":"Massachusetts Institute of Technology","degree_name":"Bachelor","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences","school":null,"contributors":[],"advisors":["Summons, Roger E.","Uveges, Benjamin"],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-06","date_published":"2023-06","updated_at":"2026-07-22T22:21:39Z","subjects":[],"languages":[],"rights":["In Copyright - Educational Use Permitted","Copyright retained by author(s)"],"rights_urls":["https://rightsstatements.org/page/InC-EDU/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1721.1/151509","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Summons, Roger E.","Uveges, Benjamin"]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. 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OAEs can be very difficult to study since modern oceans are generally well-oxygenated. Here Lake Kivu, a meromictic lake with deep anoxic layers, is presented as a potential OAE analogue and is used to study a proposed nitrogen cycling mechanism that could explain the characteristic 𝛿¹⁵N excursions associated with OAEs. Biomarkers are isolated from sediment samples and analyzed across depth below the lake floor. The results are consistent with a biologically mediated nitrogen cycling mechanism, shedding more light on a potential mechanism to explain nitrogen cycling in OAEs."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.B."]},{"key":"dc:title","label":"Title","values":["A Microbial Survey of Lake Kivu: Mechanisms of Nitrogen Cycling"]}]}],"canonical_facts":{"dc:contributor.advisor":["Summons, Roger E.","Uveges, Benjamin"],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences"],"dc:creator":["Przydzial, Kaitlyn"],"dc:date.accessioned":["2023-07-31T19:45:11Z"],"dc:date.available":["2023-07-31T19:45:11Z"],"dc:date.issued":["2023-06"],"dc:description.abstract":["Ocean Anoxic Events (OAEs) are periods in Earth’s history during which large por-tions of the oceans contain decreased amounts of oxygen. OAEs can be very difficult to study since modern oceans are generally well-oxygenated. Here Lake Kivu, a meromictic lake with deep anoxic layers, is presented as a potential OAE analogue and is used to study a proposed nitrogen cycling mechanism that could explain the characteristic 𝛿¹⁵N excursions associated with OAEs. Biomarkers are isolated from sediment samples and analyzed across depth below the lake floor. The results are consistent with a biologically mediated nitrogen cycling mechanism, shedding more light on a potential mechanism to explain nitrogen cycling in OAEs."],"dc:description.degree":["S.B."],"dc:identifier.uri":["https://hdl.handle.net/1721.1/151509"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["In Copyright - Educational Use Permitted","Copyright retained by author(s)"],"dc:rights.uri":["https://rightsstatements.org/page/InC-EDU/1.0/"],"dc:title":["A Microbial Survey of Lake Kivu: Mechanisms of Nitrogen Cycling"],"dc:type":["Thesis"],"thesis:degree_name":["Bachelor","Bachelor of Science in Earth, Atmospheric, and Planetary Sciences"]},"updated_at":"2026-07-22T22:21:39Z"}