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Temporal and spatial distribution of microcrustacean zooplankton in relation to turbidity and other environmental factors in a large tropical lake (L. Tana, Ethiopia)

Dejen, E. and Vijverberg, J. and Nagelkerke, L.A.J. and Sibbing, F.A. (2004) Temporal and spatial distribution of microcrustacean zooplankton in relation to turbidity and other environmental factors in a large tropical lake (L. Tana, Ethiopia). Hydrobiologia, 513, 39-49. ISSN 0018-8158.

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Official URL: http://dx.doi.org/10.1023/B:hydr.0000018163.60503.b8

Abstract

The spatial and seasonal distribution of microcrustacean zooplankton of Lake Tana (Ethiopia) was monthly studied for 2 years. Concurrently, various environmental parameters were measured and related to zooplankton distribution. Canonical Correspondence Analysis (CCA) was used to estimate the influence of abiotic factors and chlorophyll a content in structuring the zooplankton assemblage. Among the environmental factors, zooplankton abundance correlated most strongly with turbidity. Turbidity was negatively correlated with species abundance, especially for Daphnia spp. and to the least extent for Diaphanosoma spp. Analysis of variance (ANOVA) was used to determine spatial (littoral, sublittoral and pelagic zone) and temporal (four seasons) variation in zooplankton abundance. We observed significant temporal differences in zooplankton abundance, with highest densities during dry season (November–April). Only cladocerans showed significant differences in habitat use (highest densities in the sublittoral zone). [KEYWORDS: tropical limnology; high altitude lakes; Africa; copepods; cladocerans; silt load]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11504
Deposited On:23 Nov 2011 01:00
Last Modified:31 Mar 2014 11:07

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