Influence of continental history on the ecological specialization and macroevolutionary processes in the mammalian assemblage of South America: Differences between small and large mammals |
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| Authors: | Ana Moreno Bofarull Antón Arias Royo Manuel Hernández Fernández Edgardo Ortiz-Jaureguizar Jorge Morales |
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| Institution: | 1.Dept. Biología, Facultad de Ciencias,Universidad Autónoma de Madrid. C/Darwin 2,Cantoblanco,Spain;2.Serv. Microbiología, Hospital Universitario Ramón y Cajal,Madrid,Spain;3.Dept. Paleontología, Facultad de Ciencias Geológicas,Universidad Complutense de Madrid,Madrid,Spain;4.Unidad de Investigación de Paleontología,Instituto de Geología Económica, Consejo Superior de Investigaciones Científicas,Madrid,Spain;5.Laboratorio de Sistemática y Biología Evolutiva (LASBE), Facultad de Ciencias Naturales y Museo,Universidad de la Plata. Paseo del Bosque s/n,La Plata,Argentina;6.Dept. Paleobiología, Museo Nacional de Ciencias Naturales,Consejo Superior de Investigaciones Científicas,Madrid,Spain |
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| Abstract: | Background This 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. |
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