Fish communities along environmental gradients within the Comoé River basin, Côte d\'Ivoire

  • Stanislas S Yao Laboratoire d’Hydrobiologie, UFR Biosciences, Université de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
  • Essetchi P Kouamélan Laboratoire d’Hydrobiologie, UFR Biosciences, Université de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
  • Tidiani Koné Laboratoire d’Hydrobiologie, UFR Biosciences, Université de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
  • Valentin N’Douba Laboratoire d’Hydrobiologie, UFR Biosciences, Université de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
  • Gooré Bi Laboratoire d’Hydrobiologie, UFR Biosciences, Université de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
  • Frans Ollevier Laboratory for Comparative Anatomy and Biodiversity, Katholieke Universiteit Leuven, Ch De Bériotstraat 32, B-3000 Leuven, Belgium
  • Dirk FE Thys van den Audenaerde
Keywords: Comoé basin, Comoé National Park, Côte d'Ivoire, environmental gradients, fish assemblages

Abstract

Eighty-four sites in the Comoé basin (Côte d'Ivoire, West Africa) were sampled to identify fish assemblages and their relationships with some environmental variables. Seventy-six freshwater fish species were collected from 22 families and 44 genera: 11 marine and/or brackish water species, one introduced species, and one hybrid form. Nine species were reported for the first time in this basin. Seventeen species collected previously were not detected. Among the fishes sampled, characids were the most abundant. Statistical analysis identified four groups of sites characterised by distinct fish assemblages within the Comoé basin. Assemblages from Comoé National Park were characterised by a higher proportion of Mormyridae. In the upper catchment, Cyprinidae were predominant. Downstream, assemblages were distinguished by the presence of marine and/or brackish-water fish species and the absence of Mochokidae. The middle catchment was characterised by the presence of more Characidae, Clariidae and Cichlidae than in the other sectors. The main environmental factors influencing fish distribution were substrate types — comprising rocks, mud and leaves or wood — pH, total dissolved solids, temperature and river width.

Keywords: Comoé basin, Comoé National Park, Côte d'Ivoire, environmental gradients, fish assemblages

African Journal of Aquatic Science 2005, 30(2): 185–194
Published
2006-01-04
Section
Articles

Journal Identifiers


eISSN: 1727-9364
print ISSN: 1608-5914