Fish assemblages in relation to environmental gradients along a small west African coastal basin, the San Pedro River, Ivory Coast

  • T Koné Laboratoire d’Hydrobiologie, UFR Biosciences, Université de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
  • GG Teugels Laboratory of Comparative Anatomy and Biodiversity, Ch. De Bériotstraat 32, B-3000 Leuven, Belgium, and Laboratory of Ichthyology, Royal Museum of Central Africa, B-3080 Tervuren, Belgium
  • V N´Douba Laboratoire d’Hydrobiologie, UFR Biosciences, Université de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
  • EP Kouamélan Laboratoire d’Hydrobiologie, UFR Biosciences, Université de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
  • G Gooré Bi Laboratoire d’Hydrobiologie, UFR Biosciences, Université de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire

Abstract

Patterns of fish population composition were examined in the San Pedro River, Ivory Coast, in 2001 to assess whether distinct types of assemblage exist along longitudinal gradients within this small coastal basin. A total of 45 species was found: 28 in the lower and the upper courses of the river and 29 in Faé man-made lake. The environmental variables most closely associated with assemblage-level patterns were those which can be significantly modified by dam construction: transparency, conductivity, current and sampling site position on the basin. Groups were separated by means of canonical correspondence analysis and cluster analysis. Downstream assemblages were distinguished by the presence of marine and brackish water fish species and a relatively low abundance of cichlid fishes. Assemblages from Lake Faé were characterised by a predominance of cichlids.

Keywords: fish assemblages; environmental gradients; San Pedro River; Ivory Coast

(Afr J Aqua Sci: 2003 28(2): 163-168)
Published
2004-03-15
Section
Articles

Journal Identifiers


eISSN: 1727-9364
print ISSN: 1608-5914