Spatial and temporal demographic variation drives within-season fluctuations in sexual selection
Spatial and temporal demographic variation drives within-season fluctuations in sexual selection
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DOI：
10.1111/j.1558-5646.2008.00446.x
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发表时间：
2008-09-01
期刊：
影响因子：
3.3
通讯作者：
Herberstein, Marie E.
中科院分区：
文献类型：
--
作者：
Kasumovic, Michael M.;Bruce, Matthew J.;Herberstein, Marie E.
我们对自然选择的理解主要源于选择梯度的全季节和横截面估计。这些估计表明，选择在季节内相对恒定，但在季节之间存在波动。然而，选择的强度取决于人口统计数据，并且由于人口统计数据可能会在季节内发生变化，因此我们对于人口统计数据的季节性波动可能在多大程度上导致选择变化的理解存在差距。在这里，我们使用密度不同的两个金球网蜘蛛（Nephila Plumipes）种群来研究一个季节内人口统计数据如何变化以及选择是否存在相关变化。我们证明了性别比例和密度在多个空间和时间尺度上存在季节内变化。这种变化导致雄性在季节的不同时间遇到的竞争挑战发生变化，并且与采样期间雄性体型和体重的选择梯度的显着变化相关。我们强调了解所研究生物体的生物学以正确确定检查选择的相关尺度的重要性。我们还认为，研究可能会通过平均值低估选择的真实变异，从而导致对选择对表型进化的影响的误解。
Our understanding of selection in nature stems mainly from whole-season and cross-sectional estimates of selection gradients. These estimates suggest that selection is relatively constant within, but fluctuates between seasons. However, the strength of selection depends on demographics, and because demographics can vary within seasons, there is a gap in our understanding regarding the extent to which seasonal fluctuations in demographics may cause variation in selection. Here we use two populations of the golden orb-web spider (Nephila plumipes) that differ in density to examine how demographics change within a season and whether there are correlated shifts in selection. We demonstrate that there is within-season variation in sex ratio and density at multiple spatial and temporal scales. This variation led to changes in the competitive challenges that males encountered at different times of the season and was correlated with significant variation in selection gradients on male size and weight between sampling periods. We highlight the importance of understanding the biology of the organism under study to correctly determine the relevant scale in which to examine selection. We also argue that studies may underestimate the true variation in selection by averaging values, leading to misinterpretation of the effect of selection on phenotypic evolution.