Evaluating the existence and benefit of major histocompatibility complex‐based mate choice in an isolated owl population
Evaluating the existence and benefit of major histocompatibility complex‐based mate choice in an isolated owl population
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评估孤立猫头鹰种群中基于主要组织相容性复合物的配偶选择的存在和益处
DOI：
10.1111/jeb.13629
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发表时间：
2020
影响因子：
2.1
通讯作者：
Takagi Masaoki
中科院分区：
文献类型：
--
作者：
Sawada Akira;Ando Haruko;Takagi Masaoki
择偶偏好最初是如何演变的一直是性选择的一个主要难题。解释这一点的一些假设假设健康益处来自后代。基于主要组织相容性复合体（MHC）的配偶选择是与此类跨代机制相关的配偶选择的典型例子。为了提供基于 MHC 的择偶健康益处的证据，之前的研究评估了自身 MHC 基因型与自身健康成分之间的关联。然而，在野生种群中，很少测量亲代中基于 MHC 的配偶选择与后代中的健康成分之间的关联。我们关注日本南大东岛一夫一妻制的琉球角鸮（Otus elegans interpositus）的孤立种群，发现了基于 MHC 的择偶证据。然而，我们没有发现任何证据表明基于 MHC 的择偶可以提高自身的繁殖成功率或后代的存活率。这是一个罕见的案例研究，它直接检验了基于 MHC 的配偶选择对于野生鸟类群体中跨代数据遗传兼容性的跨代间接效益的存在。通过调查配偶选择的适应性益处，本研究有助于我们理解基于 MHC 的配偶选择的进化。 摘要我们使用跨代数据测试了基于 MHC 的配偶选择的存在性及其对琉球角鸮 (Otus elegans interpositus) 孤立种群的适应性益处。我们报告了基于 MHC 的择偶和近亲繁殖避免的证据。然而，我们没有得到证据表明交配偏差对当前一代具有直接的适应性益处和/或多代之间的间接适应性益处。尽管不支持交配偏差的适应性益处，但使用跨代数据本身对其进行了测试。这点很重要，因为 MHC 研究中经常假设这种跨代间接适应性益处，但很少直接在野生种群中进行测试。
How mate preferences evolve in the first place has been a major conundrum for sexual selection. Some hypotheses explaining this assume fitness benefit derived from subsequent generations. Major histocompatibility complex (MHC)‐based mate choice is a representative example of the mate choice that is associated with such trans‐generational mechanisms. To provide evidences for fitness benefit of MHC‐based mate choice, previous studies assessed the association between own MHC genotype and own fitness components. However, the association between MHC‐based mate choice in the parental generation and fitness components in the resultant offspring generation has only rarely been measured in wild populations. Focusing on the isolated population of the monogamous Ryukyu Scops Owl (Otus elegans interpositus) on Minami‐daito Island, Japan, we found evidence of MHC‐based mate choice. However, we found no evidence of MHC‐based mate choice increasing own reproductive success or offspring survival. This is a rare case study that directly examines the existence of the trans‐generational indirect benefit of MHC‐based mate choice for genetic compatibility from trans‐generational data in a wild bird population. By investigating the fitness benefits of mate choice, this study serves to facilitate our understanding of the evolution of MHC‐based mate choice.AbstractWe tested the existence of MHC‐based mate choice and its fitness benefit for an isolated population of Ryukyu Scops Owl (Otus elegans interpositus), using trans‐generational data. We reported an evidence of MHC‐based mate choice and inbreeding avoidance. However, we did not get evidence of the mating bias having either direct fitness benefit at present generation and/or indirect fitness benefit across multiple generations. Although fitness benefit of the mating bias was not supported, testing it using trans‐generational data per.se. is important because such trans‐generational indirect fitness benefit is often assumed in MHC studies but rarely tested directly in wild populations.