Hugueny Bernard auteur aut IRD text journalArticle eng text/pdf reformatted digital access Some factors influencing the species richness of West African fish communities were studied in a sample of 26 rivers using four habitat and hydrologic variables. Analysis of a larger sample of 39 rivers showed that species richness was positively related to area. A power function with an exponent of 0.32 gave the best fit. As the surface area used was that of the catchment area and not that (unknown) of the river, the biological significance of this relationship and the possibilities of comparison were limited. Ridge regression analysis and forward stepwise selection indicated that a model that explained ln (species richness) as a function of ln (mean annual discharge) and ln (catchment surface area) was best, accounting for 90% of the variance of the dependent variable. (D'après résumé d'auteur) specialized POISSON D'EAU DOUCE REPARTITION GEOGRAPHIQUE DIVERSITE SPECIFIQUE ANALYSE STATISTIQUE STRUCTURE DU PEUPLEMENT ZONE REFUGE AFRIQUE DE L'OUEST 036EAUCON01 79 236-243 1989 0029-8549 https://www.documentation.ird.fr/hor/fdi:42798 10.1007/BF00388483 0029-8549 [F B42798] https://www.documentation.ird.fr/hor/fdi:42798 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_37-38/42798.pdf IRD - Base Horizon / Pleins textes 1995-11-13 2006-06-06 fdi:42798 fre