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

E. Dejen, J. Vijverberg, L.A.J. Nagelkerke, F.A. Sibbing

Research output: Contribution to journalArticleAcademicpeer-review

92 Citations (Scopus)

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).
Original languageEnglish
Pages (from-to)39-49
JournalHydrobiologia
Volume513
Issue number1-3
DOIs
Publication statusPublished - 2004

Keywords

  • barbs barbus-humilis
  • aquatic organisms
  • suspended clay
  • population-dynamics
  • community structure
  • reservoir
  • reproduction
  • cladocerans
  • abundance
  • dispersal

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