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Trophic niche differentiation and microhabitat utilization revealed by stable isotope analyses in a dry-forest bat assemblage at Ankarana, northern Madagascar

Published online by Cambridge University Press:  16 December 2013

Melanie Dammhahn  and
Steven M. Goodman
Melanie Dammhahn*
Affiliation:
Behavioral Ecology & Sociobiology Unit, German Primate Center (DPZ), Leibniz Institute for Primate Research, Kellnerweg 4, D-37077 Göttingen, Germany
Steven M. Goodman
Affiliation:
Association Vahatra, BP 3972, Antananarivo 101, Madagascar Field Museum of Natural History, Science and Education, 1400 South Lake Shore Drive, Chicago, Illinois 60605, USA
*
1Corresponding author: Email: [email protected]
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Abstract:

Bats are important components in tropical mammal assemblages. Unravelling the mechanisms allowing multiple syntopic bat species to coexist can provide insights into community ecology. However, dietary information on component species of these assemblages is often difficult to obtain. Here we measured stable carbon and nitrogen isotopes in hair samples clipped from the backs of 94 specimens to indirectly examine whether trophic niche differentiation and microhabitat segregation explain the coexistence of 16 bat species at Ankarana, northern Madagascar. The assemblage ranged over 4.4‰ in δ15N and was structured into two trophic levels with phytophagous Pteropodidae as primary consumers (c. 3‰ enriched over plants) and different insectivorous bats as secondary consumers (c. 4‰ enriched over primary consumers). Bat species utilizing different microhabitats formed distinct isotopic clusters (metric analyses of δ13C–δ15N bi-plots), but taxa foraging in the same microhabitat did not show more pronounced trophic differentiation than those occupying different microhabitats. As revealed by multivariate analyses, no discernible feeding competition was found in the local assemblage amongst congeneric species as compared with non-congeners. In contrast to ecological niche theory, but in accordance with studies on New and Old World bat assemblages, competitive interactions appear to be relaxed at Ankarana and not a prevailing structuring force.

Keywords

Ankaranacanopy effectChiropteracoexistencecommunity structurecongeneric speciesdry deciduous forestMadagascar
Type
Research Article
Information
Journal of Tropical Ecology , Volume 30 , Issue 2 , March 2014 , pp. 97 - 109
Copyright
Copyright © Cambridge University Press 2013 

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References

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