Diel vertical distribution of zooplankton in Lake Naivasha,Kenya |
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Authors: | Kenneth M Mavuti |
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Institution: | (1) Department of Zoology, University of Nairobi, P.O. Box 30197, Nairobi, Kenya |
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Abstract: | Diurnal and diel vertical distribution of limnetic zooplankton species in relation to temperature and dissolved oxygen profiles
was examined at a central station in Lake Naivasha. During calm days thermal stratification developed gradually from late
morning to reach maximum formation at mid-day. Dissolved oxygen concentrations showed similar vertical profiles to temperature.
These stratifications were, however, short lived and were broken up in late afternoons by the wind induced poly-holomictic
nature of the lake. During the day most zooplankters aggregate at the top 3–4 metre zone of the water column coincident with
maximum photosynthetic activity. The pattern of diel vertical distribution of zooplankton in Lake Naivasha is undefinedly
even. The absence of significant diel changes in the distribution of the limnetic zooplankton may be related to the absence
of permanent physico-chemical boundaries and lack of predation pressure in the open water. |
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Keywords: | zooplankton vertical distribution Lake Naivasha |
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