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Selection on multiple sexual signals in two Central and Eastern European populations of the barn swallow

dc.contributor.authorWilkins, Matthew R.
dc.identifier.citationPap PL, Fülöp A, Adamkova M, et al. Selection on multiple sexual signals in two Central and Eastern European populations of the barn swallow. Ecol Evol. 2019;9:11277–11287. https ://
dc.descriptionOnly Vanderbilt University affiliated authors are listed on VUIR. For a full list of authors, access the version of record at
dc.description.abstractVariation in intensity and targets of sexual selection on multiple traits has been suggested to play a major role in promoting phenotypic differentiation between populations, although the divergence in selection may depend on year, local conditions or age. In this study, we quantified sexual selection for two putative sexual signals across two Central and East European barn swallow (Hirundo rustica rustica) populations from Czech Republic and Romania over multiple years. We then related these differences in selection to variation in sexual characters among barn swallow populations. Our results show that tail length and ventral coloration vary between populations, sexes, and age classes (first-time breeders vs. experienced birds). We found that selection on tail length was stronger in first-time breeders than in experienced birds and in males than in females in the Romanian population, while these differences between age groups and sexes were weak in Czech birds. We suggest that the populational difference in selection on tail length might be related to the differences in breeding conditions. Our results show that ventral coloration is darker (i.e., has lower brightness) in the Romanian than in the Czech population, and in experienced birds and males compared with first-time breeders and females, respectively. The sexual difference in ventral coloration may suggest sexual selection on this trait, which is supported by the significant directional selection of ventral coloration in first-time breeding males on laying date. However, after controlling for the confounding effect of wing length and tarsus length, the partial directional selection gradient on this trait turned nonsignificant, suggesting that the advantage of dark ventral coloration in early breeding birds is determined by the correlated traits of body size. These findings show that ventral coloration may be advantageous over the breeding season, but the underlying mechanism of this relationship is not clarified.en_US
dc.description.sponsorshipRomanian Ministry of Research and Innovation, Grant/Award Number: PN-III-P4-ID-PCE-2016-0404; Fulbright Scholarship; Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences; Campus Hungary Program, Grant/Award Number: B2/1SZ/11551 and B2/1R/19362; National Research, Development and Innovation Office of Hungary, Grant/Award Number: K 112527 and PD 121166; Czech Science Foundation, Grant/Award Number: 15-11782S and 19-22538S; Ministry of Culture of the Czech Republic, Grant/Award Number: DKRVO 2019-2023/6.VIII. c; National Museum, Grant/Award Number: 00023272en_US
dc.publisherEcology and Evolutionen_US
dc.rights© 2019 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. 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.
dc.subjectbarn swallowen_US
dc.subjectHirundo rustica rusticaen_US
dc.subjectsexual selectionen_US
dc.subjecttail lengthen_US
dc.subjectventral colorationen_US
dc.titleSelection on multiple sexual signals in two Central and Eastern European populations of the barn swallowen_US

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