Price T, Kirkpatrick M, Arnold S J
Department of Biology, University of California, San Diego, La Jolla 92093.
Science. 1988 May 6;240(4853):798-9. doi: 10.1126/science.3363360.
In many bird species, those pairs that breed earlier in the season have higher reproductive success than those that breed later. Since breeding date is known to be heritable, it is unclear why it does not evolve to an earlier time. Under assumptions outlined by Fisher, a model is developed that shows how breeding date may have considerable additive genetic variance, appear to be under directional selection, and yet not evolve. These results provide a general explanation for a persistent correlation of fitness with a variety of traits in natural populations.
在许多鸟类物种中，那些在季节中较早繁殖的配对比晚繁殖的配对具有更高的繁殖成功率。由于已知繁殖日期是可遗传的，目前尚不清楚为何它没有进化到更早的时间。在费希尔概述的假设下，开发了一个模型，该模型展示了繁殖日期如何可能具有相当大的加性遗传方差，看似处于定向选择之下，但却没有进化。这些结果为自然种群中适应性与各种性状之间持续存在的相关性提供了一个一般性解释。
