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Condition-dependent sex allocation by clones of a galling aphid

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Title: Condition-dependent sex allocation by clones of a galling aphid
Authors: Akimoto, Shin-ichi Browse this author →KAKEN DB
Murakami, Taiga Browse this author
Keywords: Inbreeding
Kaltenbachiella japonica
Local mate competition
Local resource competition
Parthenogenesis
Sex ratio
Issue Date: Nov-2012
Publisher: Springer-Verlag
Journal Title: Behavioral Ecology and Sociobiology
Volume: 66
Issue: 11
Start Page: 1475
End Page: 1484
Publisher DOI: 10.1007/s00265-012-1402-8
Abstract: Local mate competition (LMC) has been postulated to be the primary factor of female-biased sex allocation. In animals such as aphids that exhibit seasonal alternations of clonal and sexual reproduction, there is a high possibility of intra-clonal mating and LMC. This possibility is more plausible for more fecund clones, but out-breeding is predicted for less fecund clones. We hypothesize that clones that are more fecund will gain higher fitness returns by reducing investment in males because of more intense LMC among clonal males. We tested this hypothesis by elucidating the clonal sex allocation patterns of the galling aphid Kaltenbachiella japonica, in which inbreeding and LMC appear to be common. Winged mothers that emerge from a gall, belonging to the same clone, produced males and sexual females asexually on a branch, without dispersing to other trees. The heavier the gall, the more winged mothers were produced from the gall. Individual mothers produced a constant number of males and a variable number of females. The clonal sex allocation to males was 39.8%, on average, and decreased with increasing gall weight. This result showed that clones that were more fecund exhibited more female-biased sex allocation and thus supported our hypothesis. Furthermore, our results corroborated Stubblefield and Seger's hypothesis for sex allocation in patch structure rather than Yamaguchi's constant male hypothesis. We conclude that K. japonica clones are able to adjust their sex allocation patterns adaptively depending on the quality of resources in the galls.
Rights: The original publication is available at www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/53463
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 秋元 信一

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