Lynch Michael
Department of Biology, University of Oregon, Eugene, OR, 97403, USA.
Evolution. 1991 May;45(3):622-629. doi: 10.1111/j.1558-5646.1991.tb04333.x.
Inbreeding with close relatives and outbreeding with members of distant populations can both result in deleterious shifts in the means of fitness-related characters, most likely for very different reasons. Such processes often occur simultaneously and have important implications for the evolution of mating systems, dispersal strategies, and speciation. They are also relevant to the design of breeding strategies for captive populations of endangered species. A general expression is presented for the expected phenotype of an individual under the joint influence of inbreeding and crossbreeding. This expression is a simple function of the inbreeding coefficient, of source and hybridity indices of crossbreeding, and of specific forms of gene action. Application of the model may be of use in identifying the mechanistic bases for a number of evolutionary phenomena such as the shift from outbreeding enhancement to outbreeding depression that occurs with population divergence.
与近亲进行近亲繁殖以及与远缘种群的成员进行远交繁殖都可能导致与适应度相关性状的均值出现有害变化，最有可能是由于非常不同的原因。这些过程通常同时发生，并且对交配系统、扩散策略和物种形成的进化具有重要意义。它们也与濒危物种圈养种群的育种策略设计相关。给出了一个个体在近亲繁殖和杂交的共同影响下预期表型的一般表达式。该表达式是近亲繁殖系数、杂交的来源和杂种性指数以及基因作用的特定形式的简单函数。该模型的应用可能有助于确定许多进化现象的机制基础，例如随着种群分化从远交增强到远交衰退的转变。
