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Intraspecific patterns of ectoparasite abundances on Paraguayan bats: effects of host sex and body size

Published online by Cambridge University Press:  01 January 2008

Steven J. Presley  and
Michael R. Willig
Steven J. Presley*
Affiliation:
Center for Environmental Sciences and Engineering and Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269-4210, USA
Michael R. Willig
Affiliation:
Center for Environmental Sciences and Engineering and Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269-4210, USA
*
1Corresponding author. Email: [email protected]
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Abstract:

Although levels of parasitism can vary greatly among individual bats of the same species, little is known about the characteristics of hosts that affect such variation. Bats were captured via mist nets from June 1995 to July 1997 from 28 localities throughout Paraguay. Over 17 500 ectoparasites were collected from 2909 bats; however, analyses of ectoparasite abundance were restricted to more abundant taxa of host and ectoparasite. We quantified the abundances of 29 taxa of ectoparasite on 19 species of bat host, as well as total abundance of ectoparasites regardless of taxonomic affiliation for 22 species of bat from Paraguay. The effects of host sex and host body size on these estimates of ectoparasite abundance were evaluated separately for each species of host. Ectoparasites did not respond consistently to host body size: ectoparasite abundance increased with host body size in 12 instances and decreased with host body size in 11 instances. Regardless of the existence or direction of effects of host body size on ectoparasite abundance, female hosts generally harboured more ectoparasites than did male hosts. Differences in host quality associated with the sex of bats, especially those related to behaviour, may be a more important determinant of ectoparasite abundance than are differences in size. Opportunities for host transfer are critical for species persistence of ectoparasites; consequently, ectoparasite populations on host individuals that form social groups or colonies should be larger, less prone to stochastic extinction, and have greater opportunity for speciation.

Keywords

ArthropodaChiropteraectoparasite abundancehost social systemhost specificityMacronyssidaeParaguayroosting ecologySpinturnicidaeStreblidae
Type
Research Article
Information
Journal of Tropical Ecology , Volume 24 , Issue 1 , January 2008 , pp. 75 - 83
Copyright
Copyright © Cambridge University Press 2008

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