The trans-riverine genetic structure of 28 Amazonian frog species is dependent on life history

摘要: Among the hypotheses formulated to explain origin of Amazonian biodiversity, two (the riverine-barrier and river-refuge hypotheses) focus on role that rivers play as biotic barriers promoting speciation. However, empirical results have both supported refuted these hypotheses. This is likely due, at least in part, river-specific hydrologic characteristics biology focal species. The Guiana Shield represent a model system because they had more stable courses over time than those western Amazon Basin, where most tests riverine barrier effects taken place. We tested whether life-history traits (body size, habitat larval development), expected be important determining dispersal ability, 28 frog species are associated with genetic structure distances individuals sampled from banks Oyapock River. Thirteen displayed consistent river acting dispersal. Surprisingly, body size was not correlated trans-riverine population structure. leaf-litter dwellers lacking free-living tadpoles were found exhibit higher river-associated open habitat/arboreal exotrophic tadpoles. These demonstrate an structuring diversity many though permeability such highly dependent species-specific traits.