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Lagoons

Factors affecting macrobenthic fauna in a tropical hypersaline coastal lagoon in Ghana, West Africa


The macrobenthic fauna in the large, hypersaline, shallow Keta lagoon in Ghana was sampled at 20 stations in the wet (September 2002) and dry seasons (March 2003) to elucidate the effects of abiotic factors on community patterns. The macrobenthic fauna was low in density and species diversity and numerically dominated by bivalves and capitellid polychaetes. These organisms appear able to withstand physical disturbance (when lagoon water levels become extremely low) and osmotic stress (when salinities are extremely high) and tend to redistribute along environmental gradients. Parallel seasonal differences in several environmental variables and the macrobenthic fauna indicate a highly dynamic system. Species richness and diversity were higher in the wet season than the dry season. Salinity, percent clay, pH, and turbidity in that order were the major significant variables structuring the macrobenthic faunal assemblage in Keta lagoon. The strong effect of seasonal salinity changes on macrobenthic faunal assemblages may have trophic consequences for higher organisms of commercial importance, such as fishes and shorebirds, in the Keta lagoon.

 

Name of Author(s):
Lamptey, E., & Armah, A. K.
Institutional Affiliation:

Department of Oceanography and Fisheries, University of Ghana, Legon, Ghana

Type of Publication:
Journal Article
Name of Publisher or Journal:
Estuaries and Coasts
Date of Publication:
2008
Number of Pages:
13