Unsaturated Fish Communities in African Rivers

Variabilité à long terme des peuplements de poissons : résultats provenant de rivières françaises et ouest africaines

“…This scénario is concordant with the view that river fish communities at the local scale are open communities and dépendant on factors operating on a larger spatial scale such as species pool size and distance from a colonization source (DETENBECK et al, 1992 ;OSBORNE & WILEY 1992 ;HUGUENY & PAUGY, 1995). Within the river Rhône, our results (a négative relationship between relative species richness index and MCV) would seem to agrée with this hypothesis, but they are equivocal if other rivers are included in the analysis.…”

Effects of natural and anthropogenic environmental changes on riverine fish assemblages: a framework for ecological assessment of rivers

“…Patterns and processes observed in local fish assemblages are not only determined by local mechanisms acting within assemblages, but also result from processes operating at larger spatial scales (Hugueny and Paugy, 1995;Hugueny et al, 1997;Angermeier and Winston, 1998;Oberdorff et al, 1998, Jackson et al, 2001). The richness and structure of local fish assemblages has been linked to factors ranging from geomorphology and climate (Nelson et al, 1992;Whittier et al, 1988;Matthews and Matthews, 2000;Tejerina-Garro, 2001), to richness of regional species pool (Hugueny and Paugy, 1995;Hugueny et al, 1997;Belkessam et al, 1997;Angermeier and Winston, 1998;Oberdorff et al, 1998;Gido and Brown, 1999).…”

“…The richness and structure of local fish assemblages has been linked to factors ranging from geomorphology and climate (Nelson et al, 1992;Whittier et al, 1988;Matthews and Matthews, 2000;Tejerina-Garro, 2001), to richness of regional species pool (Hugueny and Paugy, 1995;Hugueny et al, 1997;Belkessam et al, 1997;Angermeier and Winston, 1998;Oberdorff et al, 1998;Gido and Brown, 1999). Concerning this last relationship (local/regional richness) the emerging pattern is that few fish assemblages are trully saturated (Hugueny andPaugy 1995, Hugueny et al, 1997;Belkessam et al, 1997;Oberdorff et al, 1998).…”

Estrutura e persistência temporal da comunidade de peixes de três riachos do Alto Rio Tocantins, GO

“…O número de espécies registrado no presente estudo está dentro da amplitude de valores registrada para outros riachos de regiões tropicais (e.g. Angermeier & Karr 1983, Ibarra & Stewart 1989, Wikramanayake 1990, Hugueny & Paugy 1995, Castro & Casatti 1997, Casatti et al 2001, Fogaça et al 2003, Barreto & Aranha 2005, Langeani et al 2007). Dentre as variações registradas na literatura, fica destacado que as menores diversidades ocorrem nas áreas de cabeceira ou próximas a ela enquanto nas áreas de desembocadura ou confluência o número de espécies é sempre superior (Matthews 1986, Edds 1993, Pavanelli & Caramaschi 1997, Abes & Agostinho 2001, Barreto & Uieda 1998, Uieda & Barreto 1999, Pavanelli & Caramaschi 2003, Bifi et al 2006, Perez-Jr. & Garavello 2007.…”