Servedio Maria R
Department of Biology, CB 3280, Coker Hall, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
Evolution. 2004 May;58(5):913-24. doi: 10.1111/j.0014-3820.2004.tb00425.x.
Although reinforcement is ostensibly driven by selection against hybrids, there are often other components in empirical cases and theoretical models of reinforcement that may contribute to premating isolation. One of these components is local adaptation of a trait used in mate choice. I use several different comparisons to assess the roles that local adaptation and selection against hybrids may play in reinforcement models. Both numerical simulations of exact recursion equations and analytical weak selection approximations are employed. I find that selection against hybrids may play a small role in driving preference evolution in a reinforcement model where the mating cue is separate from loci causing hybrid incompatibilities. When females have preferences directly for purebreds of their own population, however, selection against hybrids can play a large role in premating isolation evolution. I present some situations in which this type of selection is likely to exist. This work also illustrates shortfalls of using a weak selection approach to address questions about reinforcement.
尽管强化作用表面上是由对杂种的选择驱动的，但在强化作用的实证案例和理论模型中，往往还有其他因素可能导致交配前隔离。其中一个因素是用于配偶选择的性状的局部适应性。我使用几种不同的比较方法来评估局部适应性和对杂种的选择在强化模型中可能发挥的作用。同时采用了精确递归方程的数值模拟和解析弱选择近似法。我发现，在交配信号与导致杂种不相容的基因座分离的强化模型中，对杂种的选择在驱动偏好进化方面可能只起很小的作用。然而，当雌性直接偏好自身种群的纯种时，对杂种的选择在交配前隔离进化中可能起很大作用。我提出了一些可能存在这种选择类型的情况。这项工作还说明了使用弱选择方法来解决强化问题的不足之处。
