Social pairing of Seychelles warblers under reduced constraints: MHC, neutral heterozygosity, and age

Behavioral Ecology : Official Journal of the International Society for Behavioral Ecology
David J WrightD S Richardson

Abstract

The prevalence and significance of precopulatory mate choice remains keenly debated. The major histocompatibility complex (MHC) plays a key role in vertebrate adaptive immunity, and variation at the MHC influences individual survival. Although MHC-dependent mate choice has been documented in certain species, many other studies find no such pattern. This may be, at least in part, because in natural systems constraints may reduce the choices available to individuals and prevent full expression of underlying preferences. We used translocations to previously unoccupied islands to experimentally reduce constraints on female social mate choice in the Seychelles warbler (Acrocephalus sechellensis), a species in which patterns of MHC-dependent extrapair paternity (EPP), but not social mate choice, have been observed. We find no evidence of MHC-dependent social mate choice in the new populations. Instead, we find that older males and males with more microsatellite heterozygosity are more likely to have successfully paired. Our data cannot resolve whether these patterns in pairing were due to male-male competition or female choice. However, our research does suggest that female Seychelles warblers do not choose social mates using MHC cla...Continue Reading

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Citations

Oct 4, 2019·Behavioral Ecology : Official Journal of the International Society for Behavioral Ecology·Sara Raj PantDavid S Richardson
Jan 15, 2021·Animals : an Open Access Journal From MDPI·Qianxi FanHaitao Wang

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