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JOURNAL OF PLANKTON RESEARCH | VOLUME 9 | NUMBER 1 | PAGES 1-13 | 1987
© Oxford University Press

research-article

The rotifers of Warri River, Nigeria

Austin B.M. Egborge and Prekeyi Tawari

Department of Zoology, University of Benin Benin City, Nigeria

Received on January 1, 1984; accepted on September 1, 1986 The rotifer assemblage of the dendritic tidal Warri River was investigated at four sampling points from July 1981 to July 1982. Forty-one species of Rotifera were identified. Five of these — Anuraeopsis racenesi Berzins Keratella cochlearis macracantha Lauterbom, Monostyla lunaris Pawlowsky,M. stenroosi Meissner and Trichocerca similis grandis Hauer — are being recorded for the first time in West Africa. The Warri River rotifers are 65% cosmopolitan and 20% pantropical although there was no species limited to African waters only. The dominant rotifers in the Warri River were Keratella tropica and K. cochlearis which were found in the predominantly freshwater sampling station at Udu Bridge to Warri and Orugbo Creek where low brackish water salinities and conductivities are observed from December or January to April each year. The preponderance and longitudinal distribution of these two well-known cyclomorphic rotifers provides an opportunity to study their salinity tolerance and the effect of salinity and conductivity on their cyclomorphosis by sampling along the length of the river from Udu Bridge to Forcados where the Warri River joins the Atlantic Ocean.


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