Fish assemblages structure and function along environmental gradients in rivers of Gabon (Africa)

We examined patterns in fish species assemblages structure and function along environmental gradients in rivers of Gabon. Species presence-absence data from 52 sites were first analysed by canonical correspondence analysis. Results showed that the position of sites along the upstream-downstream grad...

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Bibliographic Details
Published in:	Ecology of freshwater fish Vol. 16; no. 3; pp. 315 - 334
Main Authors:	Ibanez, C, Oberdorff, T, Teugels, G, Mamononekene, V, Lavoué, S, Fermon, Y, Paugy, D, Toham, A.K
Format:	Journal Article
Language:	English
Published:	Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01-09-2007 Blackwell Publishing Ltd
Subjects:	fish assemblages Freshwater Gabon Pisces richness rivers trophic structure Gabon Africa
Online Access:	Get full text
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Summary:	We examined patterns in fish species assemblages structure and function along environmental gradients in rivers of Gabon. Species presence-absence data from 52 sites were first analysed by canonical correspondence analysis. Results showed that the position of sites along the upstream-downstream gradient, together with elevation and water conductance were the most important predictors of local fish assemblage composition. Assemblage richness and trophic structure were further investigated using regression tree analysis. Results revealed a general increase in species richness from upstream to downstream areas and a transition from insectivorous to omnivorous, herbivorous and piscivorous species along this longitudinal gradient. There were several similarities between these previous patterns and those observed in other temperate streams suggesting a potential convergence in fish assemblage along environmental gradients in tropical and temperate riverine systems. From a conservation standpoint, these results highlight the need to evaluate all habitat types along rivers longitudinal gradient to integrate the full spectrum of species assemblages within conservation plans.
Bibliography:	http://dx.doi.org/10.1111/j.1600-0633.2006.00222.x ArticleID:EFF222 ark:/67375/WNG-2K99QTSN-K istex:1A84BB02CDE25144103CF42DC81939476956387F ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0906-6691 1600-0633
DOI:	10.1111/j.1600-0633.2006.00222.x