Female extra‐pair behavior is not associated with reduced paternal care in Thorn‐tailed Rayadito,Ecology and Evolution

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Female extra‐pair behavior is not associated with reduced paternal care in Thorn‐tailed Rayadito
Ecology and Evolution ( IF 2.3 ) Pub Date : 2021-03-06 , DOI: 10.1002/ece3.7232
Yanina Poblete _{1,

2} , Esteban Botero-Delgadillo _{1,

3,

4} , Pamela Espíndola-Hernández _{1,

3} , Gabriela Südel ₁ , Rodrigo A Vásquez ₁

Affiliation

Extra‐pair behavior is present in 76% of socially monogamous bird species with biparental care. This behavior may produce costs to females related to a reduction in paternal care. We estimated the percentage of extra‐pair offspring and quantified paternal care in 44 nests of Thorn‐tailed Rayadito (Aphrastura spinicauda) to assess whether males reduce their parental care when females obtain extra‐pair fertilizations. We used data from a sub‐Antarctic population of Rayadito located on Navarino Island (55°4′S, 67°40′W), southern Chile. We found no statistical support for a relationship between variation in paternal care and the percentage of extra‐pair offspring. We discuss how the inability of breeding males to assess their genetic paternity and potential restrictions on behavioral flexibility may explain this result. Additionally, if paternal care is subjected to sexual selection, this could limit a facultative response to female extra‐pair behavior by males. Finally, it is possible that a reduction in paternal care might not have evolved in this particular locality given the low frequency of extra‐pair paternity in our study population.

中文翻译：

刺尾雷亚迪托雌性的配对外行为与父亲照顾减少无关

在双亲照料的社会一夫一妻制鸟类中，76% 存在配对外行为。这种行为可能会给女性带来与父亲照顾减少相关的成本。我们估计了 44 个刺尾 Rayadito ( Aphrastura spinicauda ) 巢中的额外配对后代的百分比并量化了父亲的照顾，以评估当雌性获得额外配对受精时，雄性是否会减少父母的照顾。我们使用了位于智利南部纳瓦里诺岛（南纬 55°4′，西经 67°40′）的亚南极 Rayadito 种群的数据。我们没有发现任何统计数据支持父亲照顾差异与异对后代百分比之间的关系。我们讨论了繁殖雄性无法评估其遗传亲子关系以及行为灵活性的潜在限制如何解释这一结果。此外，如果父亲的照顾受到性选择的影响，这可能会限制男性对女性配对外行为的兼性反应。最后，鉴于我们的研究人群中配对外亲子鉴定的频率较低，该特定地区可能不会出现父亲照顾的减少。

更新日期：2021-04-04

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