Environmental change mediates mate choice for an extended phenotype, but not for mate quality.
Environmental change mediates mate choice for an extended phenotype, but not for mate quality.
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DOI：
10.1111/evo.13091
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发表时间：
2017-01
期刊：
影响因子：
--
通讯作者：
Barber I
中科院分区：
文献类型：
--
作者：
Head ML;Fox RJ;Barber I
性暗示，包括扩展表型，预计将成为男性遗传质量的可靠指标和/或提供有关父母质量的信息。然而，这些线索的可靠性可能取决于环境的稳定性，异质性会影响选择对这些性状的影响。在这里，我们测试了环境变化如何介导多种性特征的择偶选择，包括刺鱼的扩展表型——雄性筑巢的结构。首先，我们控制水中的溶解氧 (DO) 含量，以创造雄鱼筑巢的高或低 DO 环境。然后，我们记录了在相同或相反的溶解氧条件下，遇到这些雄性（及其巢穴）的雌性的择偶行为。高溶解氧环境中的雄性比低溶解氧环境中的雄性建造了更紧凑的巢穴，并且雄性会根据变化的条件调整其巢穴结构。雌性对扩展表型（雄性巢）的择偶选择取决于环境（雌性在高溶解氧条件下选择更紧凑的巢），而雌性对雄性表型的选择则不然（无论溶解氧水平如何，雌性都会选择体型大、精力充沛的雄性）。在这种动态背景下检查配偶选择表明，雌性会评估多种性暗示的可靠性，同时考虑到环境异质性。
Sexual cues, including extended phenotypes, are expected to be reliable indicators of male genetic quality and/or provide information on parental quality. However, the reliability of these cues may be dependent on stability of the environment, with heterogeneity affecting how selection acts on such traits. Here, we test how environmental change mediates mate choice for multiple sexual traits, including an extended phenotype–‐the structure of male‐built nests – in stickleback fish. First, we manipulated the dissolved oxygen (DO) content of water to create high or low DO environments in which male fish built nests. Then we recorded the mate choice of females encountering these males (and their nests), under either the same or reversed DO conditions. Males in high DO environments built more compact nests than those in low DO conditions and males adjusted their nest structure in response to changing conditions. Female mate choice for extended phenotype (male nests) was environmentally dependent (females chose more compact nests in high DO conditions), while female choice for male phenotype was not (females chose large, vigorous males regardless of DO level). Examining mate choice in this dynamic context suggests that females evaluate the reliability of multiple sexual cues, taking into account environmental heterogeneity.