Environmental Dynamics of Lake Victoria: Evidence from a 10,000 14C yr Diatom Record from Napoleon Gulf and Sango Bay
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Date
2016
Authors
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Journal ISSN
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Publisher
Journal of Environmental Science and Engineering
Abstract
Bio-proxies provide relevant information on ecosystem health and environmental dynamics. In this study, diatom
assemblages of two cores collected from the Ugandan side of Lake Victoria at Napoleon Gulf (“NAPG1” (GPS, 00º25'44.5" N,
033º14'10.4" E)) and Sango Bay (“SAGB2” (GPS, 00º51'48.0" S, 031º42'47.8" E)) provide evidence of long term changes in the
Lake Basin from ca 10,500 years to present. Diatom information was supported by phytolith data from the same cores. The period
from ca 10,500-8,100 calyrBP experienced moderate precipitation, strong turbulence with reduced forest cover in the lake’s
catchments. During the phase ca 8,100-6,600 calyrBP, the lake basin experienced increased precipitation but with reduced mixing
of the water column. This period was also characterized by increased forest vegetation cover as reflected by phytolith assemblages.
The period from ca 5,900-1,400 calyrBP was characterized by regular changes in precipitation, turbulence and vegetation taxa in
the catchment areas. The phase from ca. 1,800 calyrBP to present was characterized by significant increase in Fragilaria and
Nitzschia species as well as increase in Nitzschia: Aulacoseira ratio which may be attributed to human involvement in the ecological
functioning of Lake Victoria ecosystem.
Description
Keywords
Diatom, Napoleon Gulf, Sango Bay, Lake Victoria
Citation
Nakintu, J., & Lejju, J. (2016). Environmental Dynamics of Lake Victoria: Evidence from a 10,000 14C yr Diatom Record from Napoleon Gulf and Sango Bay. Journal of Environmental Science and Engineering, 5, 626-637. doi:10.17265/2162-5298/2016.12.005