%0 Journal Article
%T Development of a fish-based index of biotic integrity (FIBI) to assess the quality of Bandama River in C te d¡¯Ivoire* D¨¦veloppement d¡¯un indice d¡¯int¨¦grit¨¦ biotique bas¨¦ sur le poisson pour ¨¦valuer la qualit¨¦ du fleuve Bandama en C te d¡¯Ivoire
%A Aboua B.R.D.
%A Kouam¨¦lan E.P.
%A N¡¯Douba V.
%J Knowledge and Management of Aquatic Ecosystems
%D 2012
%I EDP Sciences
%R 10.1051/kmae/2012002
%X The aim of this study was to develop effective tools based on fish assemblages, allowing the development of an effective assessment approach for the ecological status of running waters. Fish samples were collected using gill-nets with mesh sizes of 8, 10, 12, 14, 15, 18, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 and 80 mm. Forty sites were visited from October 2008 to September 2009 in the Bandama River. A large part of the data set on fish descriptors associated with environmental parameters was compiled from regional databases. For each of the fish assemblage descriptors, stepwise multiple linear regressions with habitat variables were carried out. The residuals of the models obtained were used as candidate metrics independent of natural environmental factors. Student t-tests used to compare each metric in reference and disturbed samples indicated significant difference (P < 0.05) for six metrics. The standard residuals of metrics selected were added to constitute the final index. This multimetric index of fish assemblage integrity could serve as a practical technical reference for conducting cost-effective biological assessments of lotic systems. Le but de cette ¨¦tude ¨¦tait de d¨¦velopper un outil bas¨¦ sur le peuplement de poissons qui permettrait une ¨¦valuation effective du statut des cours d¡¯eau. Les poissons ont ¨¦t¨¦ r¨¦colt¨¦s ¨¤ l¡¯aide de filets maillants de maille : 8, 10, 12, 14, 15, 18, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 et 80 mm. 40 sites ont ¨¦t¨¦ visit¨¦s durant un an (octobre 2008 ¨¤ septembre 2009) sur le fleuve Bandama. Une grande partie des donn¨¦es sur les descripteurs de poissons, associ¨¦e aux param¨¨tres environnementaux, a ¨¦t¨¦ fournie ¨¤ partir d¡¯¨¦tudes d¨¦j¨¤ r¨¦alis¨¦es en Afrique. Pour chacun des descripteurs des peuplements de poissons, des relations ont ¨¦t¨¦ ¨¦tablies avec des variables environnementales, ¨¤ partir de r¨¦gressions lin¨¦aires multiples pas ¨¤ pas. Les r¨¦sidus de ces mod¨¨les ont ¨¦t¨¦ utilis¨¦s comme m¨¦triques susceptibles d¡¯entrer dans la constitution d¡¯un indice. Le test-t utilis¨¦ pour comparer les m¨¦triques entre pr¨¦l¨¨vements perturb¨¦s et pr¨¦l¨¨vement non perturb¨¦s indiquent une diff¨¦rence significative (P < 0,05) pour six m¨¦triques. Les r¨¦sidus standards des m¨¦triques s¨¦lectionn¨¦es ont ¨¦t¨¦ additionn¨¦s pour constituer l¡¯indice final. L¡¯indice multi-param¨¦trique obtenu devrait ¨ºtre capable de fournir une ¨¦valuation pertinente de la qualit¨¦ ¨¦cologique des hydrosyst¨¨mes fluviaux.
%K habitat quality
%K freshwater fish
%K biotic index
%K bandama River
%K C te d¡¯Ivoire
%K qualit¨¦ de l¡¯habitat
%K poissons d¡¯eau douce
%K indice biotique
%K fleuve Bandama
%K C te d¡¯Ivoire
%U dx.doi.org/10.1051/kmae/2012002