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Dietary stress increases the total opportunity for sexual selection and modifies selection on condition-dependent traits.
Ecology Letters ( IF 7.6 ) Pub Date : 2019-12-15 , DOI: 10.1111/ele.13443 Silvia Cattelan 1 , Jonathan P Evans 2 , Francisco Garcia-Gonzalez 3 , Elisa Morbiato 1 , Andrea Pilastro 1
Ecology Letters ( IF 7.6 ) Pub Date : 2019-12-15 , DOI: 10.1111/ele.13443 Silvia Cattelan 1 , Jonathan P Evans 2 , Francisco Garcia-Gonzalez 3 , Elisa Morbiato 1 , Andrea Pilastro 1
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Although it is often expected that adverse environmental conditions depress the expression of condition-dependent sexually selected traits, the full consequences of environmental change for the action of sexual selection, in terms of the opportunity for total sexual selection and patterns of phenotypic selection, are unknown. Here we show that dietary stress in guppies, Poecilia reticulata, reduces the expression of several sexually selected traits and increases the opportunity for total sexual selection (standardized variance in reproductive success) in males. Furthermore, our results show that dietary stress modulates the relative importance of precopulatory (mating success) and postcopulatory (relative fertilization success) sexual selection, and that the form of multivariate sexual selection (linear vs. nonlinear) depends on dietary regime. Overall, our results are consistent with a pattern of heightened directional selection on condition-dependent sexually selected traits under environmental stress, and underscore the importance of sexual selection in shaping adaptation in a changing world.
中文翻译：
饮食压力增加了进行性选择的总机会，并改变了与条件有关的性状的选择。
尽管通常预期不利的环境条件会抑制条件依赖性性选择特征的表达，但就总性选择机会和表型选择模式而言，环境变化对性选择行为的全部后果尚不清楚。在这里，我们表明，孔雀鱼（Poecilia reticulata）的饮食压力降低了一些性选择特征的表达，并增加了男性进行总性选择（生殖成功的标准化方差）的机会。此外，我们的结果表明，饮食压力调节了交配前（交配成功）和交配后（相对受精成功）性选择的相对重要性，多元性选择的形式（线性与非线性）取决于饮食制度。
更新日期：2019-12-17
中文翻译：
饮食压力增加了进行性选择的总机会，并改变了与条件有关的性状的选择。
尽管通常预期不利的环境条件会抑制条件依赖性性选择特征的表达，但就总性选择机会和表型选择模式而言，环境变化对性选择行为的全部后果尚不清楚。在这里，我们表明，孔雀鱼（Poecilia reticulata）的饮食压力降低了一些性选择特征的表达，并增加了男性进行总性选择（生殖成功的标准化方差）的机会。此外，我们的结果表明，饮食压力调节了交配前（交配成功）和交配后（相对受精成功）性选择的相对重要性，多元性选择的形式（线性与非线性）取决于饮食制度。
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