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Elevational zonation of mammals in the central Philippines

Published online by Cambridge University Press:  10 July 2009

Lawrence R. Heaney ,
Paul D. Heideman ,
Eric A. Rickart ,
Ruth B. Utzurrum  and
J. S. H. Klompen
Lawrence R. Heaney
Affiliation:
Division of Mammals, National Museum of Natural History, Smithsonian Institution, Washington, D. C. 20560, USA
Paul D. Heideman
Affiliation:
Division of Mammals, National Museum of Natural History, Smithsonian Institution, Washington, D. C. 20560, USA Museum of Zoology, University of Michigan, Ann Arbor, Michigan 48109, USA
Eric A. Rickart
Affiliation:
Utah Museum of Natural History, University of Utah, Salt Lake City, Utah 84112, USA
Ruth B. Utzurrum
Affiliation:
Biology Department, Silliman University, 6200 Dumaguete City, Negros Oriental, Philippines
J. S. H. Klompen
Affiliation:
Museum of Zoology, University of Michigan, Ann Arbor, Michigan 48109, USA
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Abstract

Trapping and netting of small mammals on a land-bridge island (Leyte) and on an oceanic island (Negros) revealed similar patterns of elevational change in abundance and species richness. Fruit bats (Pteropodidae) reached their greatest local densities in agricultural areas, and were least abundant in montane mossy forest. The fruit bats found to be common in agri-cultural areas are widespread in Southeast Asia: in contrast, species that were most common in forested areas are Philippine endemics. Fruit bat abundance was greater on the oceanic island than on the land-bridge island. Trappable small mammals (families Soricidae and Muridae) showed no change in species richness with increasing elevation, but did show a gradual increase in overall abundance. Even though the oceanic island was depauperate of non-volant mammal species, it had the higher abundance of non-volant mammal individuals; however, this may have been due primarily to differences associated with the elevation of sampling sites. Murid rodents at the higher elevations on Leyte tend to be those that are members of the old endemic group of Philippine murids, and those at lower elevations tend to be members of more recently arrived groups. Most non-volant small mammals at all elevations on the oceanic Negros, and in agri-cultural areas on Leyte, are non-native species.

Keywords

conservationecologyendemismisland biogeographymammalsMuridaePhilippinesPteropodidaeSoricidae
Type
Research Article
Information
Journal of Tropical Ecology , Volume 5 , Issue 3 , August 1989 , pp. 259 - 280
Copyright
Copyright © Cambridge University Press 1989

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