Strong functional divergence of tropical reef fish assemblages along the global diversity gradient
Parravicini, V.; Bender, M.; Villeger, S.; Leprieur, F.; Donati, G.; Pellissier, L.; Floeter, S.; Rezende, E.; Mouillot, D.; Kulbicki, M.
Show abstract
Coral reefs are experiencing declines due to climate change and local human impacts. While at local scale biodiversity loss induces shifts in community structure, previous biogeographical analyses recorded consistent taxonomic structure of fish communities across global coral reefs. This suggest that regional communities represent a random subset of the global species and traits pool, whatever their species richness. Using distributional data on 3,586 fish species and latest advances in species distribution models we show that the global distribution of reef fishes is influenced by two major traits (body size and diet) and produces a strong divergence in the trait structure of assemblages across the biodiversity gradient. This divergence is best explained by the isolation of reefs during past unfavorable climatic conditions and highlights the risk of a global community re-organization if the ongoing climate-induced reef fragmentation is not halted.
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