Least speciose among the most speciose: Natural history correlates of monospecific and bispecific genera of Rodentia and Soricomorpha

Integrative Zoology
Giovanni AmoriLuca Luiselli

Abstract

Monospecific and bispecific genera are of special concern as they represent unique phylogenetic/evolutionary trajectories within larger clades. In addition, as phylogenetically older taxa are supposed to be exposed to higher rarity and extinction risk, monospecific and bispecific genera may be intrinsically more prone to extinction risks than multispecies genera, although extinction risks also depend on the ecological and biological strategy of the species. Here, the distribution across biogeographical zones and the levels of threat to 2 speciose orders of mammals (monospecific and bispecific genera of Rodentia and Soricomorpha) are investigated in order to highlight major patterns at the worldwide scale. In Rodentia, 39.7% of the genera (n = 490) were monospecific and 17.9% were bispecific. In Soricomorpha, 44.4% of the total genera (n = 45) were monospecific and 15% were bispecific. There was a positive correlation between the number of monospecific genera and the total number of genera per family. Peaks of monospecific and bispecific genera richness were observed in Neotropical, Oriental and Afrotropical regions in rodents and in the Palearctic region in soricomorphs. Range size was significantly uneven across biogeographic ...Continue Reading

References

Apr 15, 2000·Science·A PurvisG M Mace
Feb 14, 2008·Proceedings. Biological Sciences·Andrew Z KrugJames W Valentine
May 28, 2009·Proceedings of the National Academy of Sciences of the United States of America·Gerold KierWilhelm Barthlott
Apr 22, 2010·BMC Evolutionary Biology·Robert J Asher, Kristofer M Helgen

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