Mating Preference for Novel Phenotypes Can Be Explained by General Neophilia in Female Guppies
Mating Preference for Novel Phenotypes Can Be Explained by General Neophilia in Female Guppies
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DOI：
10.1086/710177
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发表时间：
2020-10-01
影响因子：
2.9
通讯作者：
Hughes, Kimberly A.
中科院分区：
文献类型：
--
作者：
Daniel, Mitchel J.;Koffinas, Laura;Hughes, Kimberly A.
了解生态重要性状中遗传变异如何维持是进化生物学的一个基本问题。雄性特立尼达孔雀鱼（Poecilia reticulata）在种群内的颜色图案中表现出极端的遗传多样性，这被认为是由雌性对稀有或新颖图案的交配偏好所促进的。然而，这种偏好的起源仍不清楚。在这里，我们检验了这样一个假设：对新表型的交配偏好是一般新恋癖的副产品，它是为了响应非交配环境中的选择而进化的。我们测量了女性对八种不同的新颖刺激的偏好差异，这些刺激跨越四种生态环境：配偶选择、探索、觅食和社交（但非性）互动。在八项测试中的六项中，女性表现出对新奇事物的偏好。对新奇事物的偏好的个体差异在所有八种类型的刺激中均呈正相关。此外，因子分析揭示了一般新奇癖的单一轴，它解释了对新颖颜色图案的偏好的个体差异的 61%。新奇癖的单因素结构表明，对新奇事物的兴趣主要受超越背景的共享过程的控制。由于嗜新癖可能具有相当大的遗传成分，因此我们的结果提供了证据，表明对新表型的交配偏好可能是嗜新癖自然选择的非适应性副产品。
Understanding how genetic variation is maintained in ecologically important traits is a fundamental question in evolutionary biology. Male Trinidadian guppies (Poecilia reticulata) exhibit extreme genetic diversity in color patterns within populations, which is believed to be promoted by a female mating preference for rare or novel patterns. However, the origins of this preference remain unclear. Here, we test the hypothesis that mating preference for novel phenotypes is a by-product of general neophilia that evolved in response to selection in nonmating contexts. We measured among-female variation in preference for eight different, novel stimuli that spanned four ecological contexts: mate choice, exploration, foraging, and social (but nonsexual) interactions. Females exhibited preference for novelty in six out of eight tests. Individual variation in preference for novelty was positively correlated among all eight types of stimuli. Furthermore, factor analysis revealed a single axis of general neophilia that accounts for 61% of individual variation in preference for novel color patterns. The single-factor structure of neophilia suggests that interest in novelty is governed primarily by shared processes that transcend context. Because neophilia likely has a sizable heritable component, our results provide evidence that mating preference for novel phenotypes may be a nonadaptive by-product of natural selection on neophilia.