Females pair with males larger than themselves in a socially monogamous songbird
Females pair with males larger than themselves in a socially monogamous songbird
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DOI：
10.1016/j.anbehav.2023.02.012
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发表时间：
2023-05
期刊：
影响因子：
2.5
通讯作者：
J. Welklin;C. Branch;A. Pitera;B. R. Sonnenberg;L. M. Benedict;V. Heinen;D. Kozlovsky;V. Pravosudov
中科院分区：
文献类型：
--
作者：
J. Welklin;C. Branch;A. Pitera;B. R. Sonnenberg;L. M. Benedict;V. Heinen;D. Kozlovsky;V. Pravosudov
影响社会配偶选择的因素仍然不清楚。一些物种，包括人类，会做出自我参照的配对决定。山雀是两性异形和社会一夫一妻制的。雌性与比自己大但不太大的雄性配对。繁殖性能与一对是否遵循这种模式无关。配偶选择是进化现象的关键驱动力，如两性异形。社会性配偶选择的研究比生殖性配偶选择少，但对于表现出双亲照顾的物种，社会性配偶的选择可能对后代的生存和成功有重要影响。许多物种根据大小做出配对决定，这可能导致种群规模的配对模式，例如通过大小进行选择性和选择性交配。其他基于大小的配对模式，例如雌性与比自己大的雄性配对，通常在人类中进行研究，但在非人类动物系统中研究较少。在这里，我们表明，性大小二态山雀，甘贝利，似乎表现出多种自我指配模式时，选择社会伴侣。雌性与比自己大的雄性配对的几率比预期的要高，与比自己稍大的雄性配对的几率比与比自己大得多的雄性配对的几率要高。偏好略大的男性与大得多的男性似乎并没有被驱动的生殖利益，因为有没有统计学上的显着差异，在生殖性能对男性略大，对男性比女性大得多。我们的研究结果表明，自我参照配对超越积极和消极的分类可能是常见的非人类动物系统。
HighlightsThe factors influencing social mate choice remain unclear.Some species, including humans, make self-referential pairing decisions.Mountain chickadees are sexually size dimorphic and socially monogamous.Females paired with males that were larger but not too much larger than themselves.Reproductive performance was not related to whether a pair followed this pattern.Mate choice is a key driver of evolutionary phenomena such as sexual dimorphism. Social mate choice is studied less often than reproductive mate choice, but for species that exhibit biparental care, choice of a social mate may have important implications for offspring survival and success. Many species make pairing decisions based on size that can lead to population-scale pairing patterns such as assortative and disassortative mating by size. Other size-based pairing patterns, such as females pairing with males larger than themselves, have been commonly studied in humans, but less often studied in nonhuman animal systems. Here we show that sexually size-dimorphic mountain chickadees, Poecile gambeli, appear to exhibit multiple self-referential pairing patterns when choosing a social mate. Females paired with males that were larger than themselves more often than expected by chance, and they paired with males that were slightly larger than themselves more often than they paired with males that were much larger than themselves. Preference for slightly larger males versus much larger males did not appear to be driven by reproductive benefits as there were no statistically significant differences in reproductive performance between pairs in which males were slightly larger and pairs in which males were much larger than females. Our results indicate that self-referential pairing beyond positive and negative assortment may be common in nonhuman animal systems.