Spatial and temporal variations of fish communities in the longitudinal gradient of the Mono River (Benin and Togo: West Africa)

Lederoun, Djiman; Vreven, E.; Vandewalle, Pierre; Moreau, Jacques; Lalèyè, P.

doi:10.26028/cybium/2021-452-005

Article (Scientific journals)

Spatial and temporal variations of fish communities in the longitudinal gradient of the Mono River (Benin and Togo: West Africa)

Lederoun, Djiman; Vreven, E.; Vandewalle, Pierre et al.

2021 • In Cybium, 45 (2), p. 123-140

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https://hdl.handle.net/2268/262933

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10.26028/cybium/2021-452-005

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Keywords :

Artificial neural networks; Coastal river; Environmental variables; Fish communities; Indicator value method

Abstract :

[en] Fish distribution in the Mono River is not well known. This river is interesting because of human influence, especially the Nangbéto hydroelectric dam built on it. In this study, fish communities in the Mono River between the middle (Atchinédji) and lower (Djonnougui) reaches were seasonally surveyed using two sets of gillnets of different mesh sizes (10, 12, 17, 20 and 22 mm mesh sizes) in 2012 and 2013 in ten sampling sites. In addition to fish harvesting, environmental variables were also quantified. According to fish assemblages, sampling site ordination was studied using the nonlinear clustering technique, the self-organizing map (SOM). An index of indicator value (IndVal) was calculated for each species to see if there is any indicator species, which could characterize the different types of communities identified by the SOM. A total of 37 species belonging to 28 genera and 19 families were recorded. The most widely distributed species were Brycinus cf. imberi, B. longipinnis, and B. macrolepidotus, which belong to the Alestidae family. Results from the SOM analysis indicate a three-cluster structure, mainly related to the location of the sampling sites. Our data run contrary to the ichthyo-fauna homogeneity trend in a river's middle course, and this is probably due to a major human interference in the river like the construction of the Nangbéto dam. A significant correlation between species distribution and environmental variables was found. Distance from source, altitude, forest area, canopy height, water velocity, conductivity, transparency and pH are the most discriminating fish community parameters. The IndVal method identified several characteristic species in the typical assemblages identified by the SOM technique. We suggest for any human interventions in the river that special attention should be given to the protection of the diversity of fish habitats in order to conserve their associated species and therefore preserve the biodiversity of the ichthyo-fauna of the Mono River. © SFI

Disciplines :

Aquatic sciences & oceanology

Author, co-author :

Lederoun, Djiman; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, 01 BP: 526, Cotonou, Benin, Royal Museum for Central Africa, Vertebrate Section, Ichthyology, Leuvensesteenweg 13, Tervuren, 3080, Belgium, Laboratory of Functional and Evolutionary Morphology, University of Liege, Chemistry Institute B6, Sart Tilman, Liege, 4000, Belgium

Vreven, E.; Royal Museum for Central Africa, Vertebrate Section, Ichthyology, Leuvensesteenweg 13, Tervuren, 3080, Belgium, KU Leuven, Laboratory of Biodiversity and Evolutionary Genomics, Charles Deberiotstraat 32, Leuven, 3000, Belgium

Vandewalle, Pierre ; Université de Liège - ULg

Moreau, Jacques

Lalèyè, P.; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, 01 BP: 526, Cotonou, Benin

Language :

English

Title :

Spatial and temporal variations of fish communities in the longitudinal gradient of the Mono River (Benin and Togo: West Africa)

Alternative titles :

[fr] Variations spatiales et temporelles des communautés de poissons dans le gradient longitudinal du fleuve Mono (Bénin et Togo: Afrique de l'Ouest)

Publication date :

2021

Journal title :

Cybium

ISSN :

0399-0974

eISSN :

2101-0315

Publisher :

Société Française d'lchtyologie, Paris, France

Volume :

Issue :

Pages :

123-140

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 02 September 2021

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