Hydrobiologia

, Volume 145, Issue 1, pp 159–167 | Cite as

Salinity and the distribution of Cladocera in Warri River, Nigeria

  • Austin B. M. Egborge
Distribution & Genetics

Abstract

Hydrobiological investigations of the water quality and plankton of Warri River started in 1981, shortly before the commissioning of the Delta Steel Plant on the banks of the river at Aladja. The 150 km of river gradates from pure freshwater through brackish to marine and so provides a suitable habitat for a study of the limits of migration of any group of zooplankton.

The Cladocera of Warri River consists of two bosminids, thirteen chydorids, three daphniids, three macrothricids, one moinid, and two sidids. All except the sididPenilia sp. are well known freshwater forms, which are limited in longitudinal distribution to areas with salinity below 2.5‰.

Penilia sp. found in Warri River were restricted to the truely brackish-water areas with salinity values of 7‰ −8‰. In this respect they represent the first reported brackish water Cladocera in Africa. They also differ fromPenilia avirostris Dana found in marine habitats in certain morphological details, and so the Warri RiverPenilia may be a new taxon.

Keywords

Cladocera Nigeria Warri River distribution Penilia 
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Copyright information

© Dr W. Junk Publishers 1987

Authors and Affiliations

  • Austin B. M. Egborge
    • 1
  1. 1.Department of ZoologyUniversity of BeninBenin CityNigeria

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