Galluccio Edward, Lymbery Rowan A, Wilson Alastair, Evans Jonathan P
Centre for Evolutionary Biology, School of Biological Sciences, University of Western Australia, 6009 Western Australia, Australia.
Centre for Ecology and Evolution, University of Exeter, Cornwall Campus, Penryn, UK.
R Soc Open Sci. 2022 Jun 1;9(6):220269. doi: 10.1098/rsos.220269. eCollection 2022 Jun.
There is evidence that animal personality can affect sexual selection, with studies reporting that male behavioural types are associated with success during pre- and post-copulatory sexual selection. Given these links between personality and sexual traits, and the accumulating evidence that their expression can depend on an individual's dietary status (i.e. condition), a novel prediction is that changes in a male's diet should alter both the average expression of personality and sexual traits, and their covariance. We tested these predictions using the guppy , a species previously shown to exhibit strong condition dependence in ejaculate traits and a positive correlation between sperm production and individual variation in boldness. Contrary to expectation, we found that dietary restriction-when administered in mature adult males-did not affect the expression of either behavioural (boldness and activity) or ejaculate traits, although we did find that males subjected to dietary stress exhibited a positive association between sperm velocity and boldness that was not apparent in the unrestricted diet group. This latter finding points to possible context-dependent patterns of covariance between sexually selected traits and personalities, which may have implications for patterns of selection and evolutionary processes under fluctuating environmental conditions.
有证据表明动物个性会影响性选择，研究报告称雄性行为类型与交配前和交配后的性选择成功相关。鉴于个性与性特征之间存在这些联系，以及越来越多的证据表明它们的表达可能取决于个体的饮食状况（即条件），一个新的预测是雄性饮食的变化应该会改变个性和性特征的平均表达及其协方差。我们使用孔雀鱼对这些预测进行了测试，此前已证明该物种在射精特征上表现出强烈的条件依赖性，并且精子产生与大胆程度的个体差异之间存在正相关。与预期相反，我们发现当对成年雄性进行饮食限制时，并不会影响行为（大胆程度和活动）或射精特征的表达，尽管我们确实发现遭受饮食压力的雄性在精子速度和大胆程度之间表现出正相关，而在无限制饮食组中这一相关性并不明显。后一发现指出了性选择特征与个性之间可能存在的依赖于环境背景的协方差模式，这可能对波动环境条件下的选择模式和进化过程产生影响。
