Extremely female-biased sex ratio and lethal male--male combat in a parasitoid wasp, Melittobia australica (Eulophidae)
Jun Abe,
Yoshitaka Kamimura,
Natsuko Kondo and
Masakazu Shimada
Behavioral Ecology, 2003, vol. 14, issue 1, 34-39
Abstract:
Melittobia australica (Hymenoptera: Eulophidae) is a gregarious ectoparasitoid of the prepupae and pupae of solitary wasps and bees. The males never disperse from their natal patch, and mating takes place only on the host from which they emerged. We measured the offspring sex ratio of M. australica with differing foundress numbers and examined combat between emerged males. The offspring sex ratios were extremely female biased and almost independent of foundress number in all cases. The population of M. australica used in the experiment was infected with the cytoplasmically inherited symbiotic bacterium Wolbachia. However, although Wolbachia is a potential sex-ratio distorter, noninfected individuals showed the same sex ratio patterns as the Wolbachia-infected individuals. An arena experiment showed that younger males were almost always killed by older males that had eclosed earlier. These results suggested that lethal male--male combat is an additional factor distorting the sex ratio toward a more female-biased sex ratio. This provides a new perspective on current local mate competition models. Copyright 2003.
Keywords: local mate competition; male--male combat; Melittobia australica; parasitoid wasps; sex ratios; Wolbachia (search for similar items in EconPapers)
Date: 2003
References: Add references at CitEc
Citations:
Downloads: (external link)
http://hdl.handle.net/ (application/pdf)
Access to full text is restricted to subscribers.
Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.
Export reference: BibTeX
RIS (EndNote, ProCite, RefMan)
HTML/Text
Persistent link: https://EconPapers.repec.org/RePEc:oup:beheco:v:14:y:2003:i:1:p:34-39
Ordering information: This journal article can be ordered from
https://academic.oup.com/journals
Access Statistics for this article
Behavioral Ecology is currently edited by Louise Barrett
More articles in Behavioral Ecology from International Society for Behavioral Ecology Oxford University Press, Great Clarendon Street, Oxford OX2 6DP, UK.
Bibliographic data for series maintained by Oxford University Press ().