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Limiting abiotic conditions might shape boundaries of species distribution, while biotic factors influence such distributions through interspecific relationships. When two morphologically and or/ecologically similar species are geographically overlapped, a distribution displacement or a change in size or morphology is expected to minimize competition. Environmental niche modeling (ENM) might help us understand the relationship between distribution of a species’ pair and their relationship with environmental conditions, allowing us to test the possible existence of shared distribution patterns and/or displacements across wide geographic ranges. In this work, distribution patterns and climatic and geographic overlap are analyzed between two South American small carnivorans,  Galictis cuja  and  Lyncodon patagonicus , using geographic information systems and ENM. Environmental tolerance of the latter species seems to be enclosed within the range of the former, with high geographic overlap. No evidence of niche displacement was found between them.  G. cuja  seems to be a more generalist species than  L. patagonicus , and size difference (e.g. body size, dentition size) might be the mechanism that allows coexistence between these highly similar species, although future field studies might be needed to support this statement.

mammalia

Niche overlap and shared distributional patterns between two South American small carnivorans:  Galictis cuja  and  Lyncodon patagonicus  (Carnivora: Mustelidae)