Late holocene trends of phytoplankton productivity and anoxia as inferred from diatom and geochemical proxies in Lake Victoria, Eastern Africa

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dc.contributor.authorAndama, M.
dc.contributor.authorLejju, J. B.
dc.contributor.authorTolo, C. U.
dc.date.accessioned2021-12-18T04:03:39Z
dc.date.available2021-12-18T04:03:39Z
dc.date.issued2013
dc.description.abstractLake Victoria ecosystem has undergone major ecological changes in the recent decades. Sedimentary diatom analysis and Fe/Mn determined by Energy Dispersive X-ray Fluorescence (EDXRF) have provided phytoplankton (diatom) productivity 5 and the resultant anoxia (Fe/Mn) in Lake Victoria at Napoleon Gulf during the late Holocene (1778 cal yrBP (calibrated years before present) to 2008 AD) with radiocarbon dates determined using Accelerator Mass Spectrometry standard method. The results showed that increased total diatom counts in Napoleon Gulf during the late Holocene correspond with increased Fe/Mn ratio (anoxia) in some of the pro10 files and not in others and in most cases those that correspond correlate very well with increased eutrophication from nitrate input (Total Nitrogen, TN). Therefore slightly increased anoxia not related to increased diatom productivity was recorded in Lake Victoria at Napoleon Gulf from the period 1778 to 1135 cal yrBP. There was slightly increased diatom productivity at Napoleon Gulf from the period 857 to 758 cal yr BP 15 but it did not increase anoxia in the lake. The period 415 cal yrBP to 2008 AD recorded increased anoxia at Napoleon Gulf related to high diatom productivity especially from 415 to 390 cal yrBP and 191 cal yrBP to 2008 AD.en_US
dc.identifier.citationAndama, M., Lejju, J. B., & Tolo, C. U. (2013). Late holocene trends of phytoplankton productivity and anoxia as inferred from diatom and geochemical proxies in Lake Victoria, Eastern Africa. Biogeosciences Discussions. doi:10.5194/bgd-10-17663-2013en_US
dc.identifier.other10.5194/bgd-10-17663-2013
dc.identifier.urihttps://nru.uncst.go.ug/xmlui/handle/123456789/770
dc.language.isoenen_US
dc.publisherBiogeosciences Discussionsen_US
dc.subjectLate holoceneen_US
dc.subjectPhytoplankton productivityen_US
dc.subjectAnoxiaen_US
dc.subjectGeochemical proxiesen_US
dc.subjectLake Victoriaen_US
dc.subjectEastern Africaen_US
dc.titleLate holocene trends of phytoplankton productivity and anoxia as inferred from diatom and geochemical proxies in Lake Victoria, Eastern Africaen_US
dc.typeArticleen_US
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