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Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Jul 2010, 31 (4) BackSeasonal variation and
diversity of rotifers in Ehoma lake, Nigeria Okechukwu
Idumah Okogwu1, Christopher D. 1Applied Biology
Department, 2National
Bureau of Fish Genetic Resources, Canal Ring Road, P.O. Dilkusha,
Lucknow - 226 002, India (Received: Abstract: The zooplankton and physicochemistry of Ehoma lake were studied from March
2005 to August 2006 in order to evaluate seasonal trend in species composition
and abundance in relation to water quality. Forty two (42) species of rotifers
dominated by Keratella tropica
tropica were encountered. Species richness declined
by nearly 50% from dry season values during the rainy season. Species richness
was higher in the littoral zone during the dry season,
the reverse was the case during the rainy season. Species abundance followed
similar trend as species richness. Abundance was closely associated with
dissolved oxygen, biological oxygen demand and width of the lake and these in
turn varied significantly between seasons. Shannon-Weaver diversity varied from
2.2 to 3.8 bit ind.-1 and significantly between seasons (p<0.05).
Anuraeopsis navicula navicula and Euchlanis dilatata dilatata Ehrenbreg were the only species gained during the flood
periods. Key words: Rotifer, Season, Species richness, Abundance,
Flood, ??????? PDF of full length paper
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