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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Jul 2010, 31 (4)                                                                                                             Back



Abstract _24

Seasonal variation and diversity of rotifers in Ehoma lake, Nigeria

 

Okechukwu Idumah Okogwu1, Christopher D. Nwani*1,2 and Florence A. Okoh1

1Applied Biology Department, Ebonyi State University, PMB 53, Abakaliki, Ebonyi State, Nigeria

2National Bureau of Fish Genetic Resources, Canal Ring Road, P.O. Dilkusha, Lucknow - 226 002, India

(Received: March 13, 2009; Revised received: June 26, 2009; Accepted: August 07, 2009)

 

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, Cross River

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