Using adaptive traits to consider potential consequences of temporal variation in selection: male guppy colour through time and space
Using adaptive traits to consider potential consequences of temporal variation in selection: male guppy colour through time and space
复制标题
利用适应性特征来考虑选择中时间变化的潜在后果：雄性孔雀鱼颜色随时间和空间的变化
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
A. Hendry
中科院分区：
文献类型：
--
作者：
K. Gotanda;A. Hendry
通常通过估计和比较自然种群的选择系数来评估选择的时间变化。对这些系数的荟萃分析已经产生了重要的见解，但选择系数在几个方面受到限制，包括统计效力低，不完善的适应度替代，以及性状变化后果的不确定性。一种没有这些限制的补充方法是研究适应特征本身的时间变化，这在机制上更容易，也更直接地与进化结果相关。我们通过分析雄性孔雀鱼（Poecilia reticulata）的颜色模式来说明这种方法，这些孔雀鱼每6年从特立尼达的6个地点采集。这个系统特别适合我们的研究，因为颜色变化的关键方面是基于基因的，并且对选择有反应。然而，尽管在该系统中广泛考虑了颜色变化的空间模式，但尚未有研究正式评估非操纵种群的年时间变化。与先前关于孔雀鱼系统的结论相匹配，我们发现来自不同地点的孔雀鱼在不同的捕食机制下表现出不同的颜色图案。我们在这里添加了新的发现，尽管存在一些时间变化，但颜色变化的空间模式在不同年份通常是一致的。这些结果表明，在考虑适应性状时，空间变异比时间变异更重要，尽管我们的研究系统在这方面可能是例外的。进一步研究适应性状的时空变化有助于我们更好地理解选择的时空变化在进化过程中所起的作用。©2014伦敦林奈学会，林奈学会生物学杂志，2014,112,108-122。
Temporal variation in selection is typically evaluated by estimating and comparing selection coefficients in natural populations. Meta-analyses of these coefficients have yielded important insights, but selection coefficients are limited in several respects, including low statistical power, imperfect fitness surrogates, and uncertainty regarding consequences for trait change. A complementary approach without these limitations is to examine temporal variation in adaptive traits themselves, which is mechanistically easier and more directly relevant to evolutionary consequences. We illustrate this approach by analyzing the colour patterns of male guppies, Poecilia reticulata, from each of six sites in Trinidad in each of 6 years. This system is particularly appropriate for our study because key aspects of colour variation are genetically-based and responsive to selection. However, although spatial patterns of colour variation have been extensively considered in this system, no study has yet formally assessed annual temporal variation in non-manipulated populations. Matching previous conclusions for the guppy system, we find that guppies from different sites manifest different colour patterns in association with different predation regimes. We here add the new finding that, although some temporal variation is present, spatial patterns of colour variation are generally consistent across years. These results suggest that, when considering adaptive traits, spatial variation is more important than temporal variation, although our study system might be exceptional in this regard. Additional studies examining spatiotemporal variation in adaptive traits could help to improve our understanding of the role that spatiotemporal variation in selection plays in the evolutionary process. © 2014 The Linnean Society of London, Biological Journal of the Linnean Society, 2014, 112, 108–122.