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Influence of continental history on the ecological specialization and macroevolutionary processes in the mammalian assemblage of South America: Differences between small and large mammals

AutorMoreno Bofarull, Ana; Arias Royo, Antón ; Hernández Fernández, M. ; Ortiz Jaureguizar, Edgardo; Morales, Jorge
Fecha de publicaciónmar-2008
EditorBioMed Central
CitaciónBMC Evolutionary Biology 2008, 8:97
ResumenThis paper tests Vrba's resource-use hypothesis, which predicts that generalist species have lower specialization and extinction rates than specialists, using the 879 species of South American mammals. We tested several predictions about this hypothesis using the biomic specialization index (BSI) for each species, which is based on its geographical range within different climate-zones. The four predictions tested are: (1) there is a high frequency of species restricted to a single biome, which henceforth are referred to as stenobiomic species, (2) certain clades are more stenobiomic than others, (3) there is a higher proportion of biomic specialists in biomes that underwent through major expansion-contraction alternation due to the glacial-interglacial cycles, (4) certain combinations of inhabited biomes occur more frequently among species than do others.
Versión del editorhttp://dx.doi.org/10.1186/1471-2148-8-97
URIhttp://hdl.handle.net/10261/5088
DOI10.1186/1471-2148-8-97
ISSN1471-2148
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