Morphological convergence and coexistence in three sympatric North American species of Microtus (Rodentia: Arvicolinae)

Author: Spaeth, Paula Ann

Source: Journal of Biogeography, Volume 36, Number 2, February 2009 , pp. 350-361(12)

Publisher: Wiley-Blackwell

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Abstract Aim 

Niche theory predicts that ecologically identical species cannot stably coexist in local communities. My aim was to investigate morphological diversity as a possible factor enabling the coexistence of a species-rich Microtus (Rodentia: Arvicolinae) fauna in a hotspot of North American mammalian diversity, the Greater Yellowstone Ecosystem (GYE). Location 

The Greater Yellowstone Ecosystem, North America. Methods 

Using in-hand morphological measurements of size and shape, I compared the morphologies of three North American vole species (Microtus spp.), in sympatry in the GYE and in allopatry across their ranges, in order to examine: (1) whether morphologies are fixed or plastic and (2) the degree of morphological character displacement or convergence in sympatric species. Results 

Support was found for plasticity of morphology for all three vole species: M. longicaudus, M. montanus and M. pennsylvanicus. However, Microtus individuals of all species from the GYE area of sympatry were more similar to each other than to allopatric individuals of the same species. Main conclusions 

Competition among these congeners is not manifested in morphological overdispersion. The response of these congeneric species to the same local ecological conditions is convergent. The relative strength of environmental conditions appears to be stronger than the strength of competitive interactions among the study species.
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