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image of Crustaceana

Several crustacean groups have produced extensive species flocks in ancient lakes. However, except for the Amphipoda in Lake Baikal, crustacean diversity per se is not significantly higher in ancient lakes than in non-marine aquatic habitats in general. Yet the degree of endemicity in such long-lived habitats is certainly higher in these crustacean groups than in the average of noncrustacean groups. Causality must thus be sought in the evolutionary biology, rather than in the ecology of the groups at issue. Several potential, intrinsic factors, possibly promoting speciation, have been cited, but thus far no singular cause for high crustacean endemicity in ancient lakes could be demonstrated.

Plusieurs groupes de crustaces ont produit de vastes ensembles d'especes dans les lacs anciens. Cependant, excepte pour les amphipodes du lac Baikal, la diversite des crustaces en elle-meme n'est pas significativement plus grande dans les lacs anciens que dans les habitats aquatiques nonmarins en general. Pourtant, le degre d'endemisme dans des habitats habites de si longue date est certainement plus eleve dans les groupes de crustaces que dans la moyenne des groupes non crustaces. La cause doit alors etre recherchee dans la biologie evolutive, plutot que dans l'ecologie des groupes concernes. Plusieurs facteurs potentiels, intrinseques, pouvant induire la speciation, ont ete cites, mais pour l'instant, aucune cause particuliere n'a pu etre etablie pour expliquer l'endemisme crustaceen superieur dans les lacs anciens.


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