首页 | 本学科首页   官方微博 | 高级检索  
     


PARASITES AND THE EVOLUTION OF SELF-FERTILIZATION
Authors:Aneil F.  Agrawal Curtis M.  Lively
Affiliation:Department of Biology, Indiana University, Bloomington, Indiana 47405–3700. E-mail:;Department of Biology, Indiana University, Bloomington, Indiana 47405–3700
Abstract:Abstract.— Assuming all else is equal, an allele for selfing should spread when rare in an outcrossing population and rapidly reach fixation. Such an allele will not spread, however, if self‐fertilization results in inbreeding depression so severe that the fitness of selfed offspring is less that half that of outcrossed offspring. Here we consider an ecological force that may also counter the spread of a selfing allele: coevolution with parasites. Computer simulations were conducted for four different genetic models governing the details of infection. Within each of these models, we varied both the level of selfing in the parasite and the level of male‐gamete discounting in the host (i.e., the reduction in outcrossing fitness through male function due to the selfing allele). We then sought the equilibrium level of host selfing under the different conditions. The results show that, over a wide range of conditions, parasites can select for host reproductive strategies in which both selfed and outcrossed progeny are produced (mixed mating). In addition, mixed mating, where it exits, tends to be biased toward selfing.
Keywords:Breeding-system evolution    cross-fertilization    mixed mating    parasites    Red Queen hypothesis    self-fertilization    sexual reproduction
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号