Fish community convergence along environmental gradients in lakes of France and Northeast U.S.A.

Aim To assess whether 8 traits of fish communities and 4 trophic traits) respond similarly to environmental convergence between the lakes of France and Northeast Location 75 French and 168 Northeast USA lakes. Methods The data encompass fish surveys, the assignment trophic guilds and environmental variables characterising analytical procedure was adapted from the recommendations Results The comparison of the regional pools of lacustrine about twice as speciose as France, mostly due to higher NEUSA lakes were consistently about 20% more speciose surface area. Warmer environments were consistently phytophilous and guarder species than were colder lakes. community reproductive traits. Conversely, there was trophic structure of lacustrine fish communities between Main conclusions In both continents, global warming proportion of phytophilous and guarder species, probably temperature on the availability and quality of spawning constraints, past events such as the diversification of selective extinctions during Pleistocene glaciations contribute to explain dissimilarities between the communities differences in their relationship to the environment. / Des relations comparables entre continents sont mises en évidences entre l'environnement (surface des lacs, température) et la structure des communautés de poissons.