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  No evidence for size-assortative mating in the wild despite mutual mate choice in sex-role-reversed pipefishes

Mobley, K. B., Abou Chakra, M., & Jones, A. G. (2014). No evidence for size-assortative mating in the wild despite mutual mate choice in sex-role-reversed pipefishes. Ecology and Evolution, 4(1), 67-78. doi:10.1002/ece3.907.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-115B-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-115C-B
Genre: Journal Article

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 Creators:
Mobley, Kenyon B.1, Author              
Abou Chakra, Maria2, Author              
Jones, Adam G., Author
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1Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445634              
2Research Group Evolutionary Theory, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445641              

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Free keywords: assortative mating; body size; mark–recapture; mate choice; sexual selection; Syngnathidae
 Abstract: Size-assortative mating is a nonrandom association of body size between members of mating pairs and is expected to be common in species with mutual preferences for body size. In this study, we investigated whether there is direct evidence for size-assortative mating in two species of pipefishes, Syngnathus floridae and S. typhle, that share the characteristics of male pregnancy, sex-role reversal, and a polygynandrous mating system. We take advantage of microsatellite- based “genetic-capture” techniques to match wild-caught females with female genotypes reconstructed from broods of pregnant males and use these data to explore patterns of size-assortative mating in these species. We also develop a simulation model to explore how positive, negative, and antagonistic preferences of each sex for body size affect size-assortative mating. Contrary to expectations, we were unable to find any evidence of size-assortative mating in either species at different geographic locations or at different sampling times. Furthermore, two traits that potentially confer a fitness advantage in terms of reproductive success, female mating order and number of eggs transferred per female, do not affect pairing patterns in the wild. Results from model simulations demonstrate that strong mating preferences are unlikely to explain the observed patterns of mating in the studied populations. Our study shows that individual mating preferences, as ascertained by laboratory-based mating trials, can be decoupled from realized patterns of mating in the wild, and therefore, field studies are also necessary to determine actual patterns of mate choice in nature. We conclude that this disconnect between preferences and assortative mating is likely due to ecological constraints and multiple mating that may limit mate choice in natural populations.

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Language(s): eng - English
 Dates: 2013-11-052013-10-252013-11-102013-12-112014-01
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/ece3.907
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Title: Ecology and Evolution
Source Genre: Journal
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Publ. Info: Wiley
Pages: - Volume / Issue: 4 (1) Sequence Number: - Start / End Page: 67 - 78 Identifier: ISSN: 2045-7758 (online)