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The costs and benefits of multiple mating in a mostly monandrous wasp

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Boulton_et_al_2015_Evolution.pdf (461.5Kb)
Date
04/2015
Author
Boulton, Rebecca
Shuker, David Michael
Keywords
Local mate competition
Polyandry
Sexual selection
Sex allocation
QH301 Biology
DAS
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Abstract
The taxonomically widespread nature of polyandry remains a puzzle. Much of the empirical work regarding the costs and benefits of multiple mating to females has, for obvious reasons, relied on species that are already highly polyandrous. However, this makes it difficult to separate the processes that maintain the current level of polyandry from the processes that facilitate its expression and initiated its evolution. Here we consider the costs and benefits of polyandry in Nasonia vitripennis, a species of parasitoid wasp that is “mostly monandrous” in the wild, but which evolves polyandry under laboratory culture conditions. In a series of six experiments, we show that females gain a direct fecundity and longevity benefit from mating multiply with virgin males. Conversely, mating multiply with previously mated males actually results in a fecundity cost. Sexual harassment may also represent a significant cost of reproduction. Harassment was, however, only costly during oviposition, resulting in reduced fecundity, longevity and disrupted sex allocation. Our results show that ecological changes, in our case associated with differences in the local mating structure in the laboratory can alter the costs and benefits of mating and harassment and potentially lead to shifts in mating patterns.
Citation
Boulton , R & Shuker , D M 2015 , ' The costs and benefits of multiple mating in a mostly monandrous wasp ' , Evolution , vol. 69 , no. 4 , pp. 939-949 . https://doi.org/10.1111/evo.12636
Publication
Evolution
Status
Peer reviewed
DOI
https://doi.org/10.1111/evo.12636
ISSN
0014-3820
Type
Journal article
Rights
Copyright 2015 The Authors Evolution published by Wiley Periodicals, Inc. on behalf of The Society for the Study of Evolution. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Description
Funding: NERC DTG
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/6453

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