Evol Ecol Res 6: 1219-1236 (2004)     Full PDF if your library subscribes.

Selection against migrants contributes to the rapid evolution of ecologically dependent reproductive isolation

Andrew P. Hendry*

Redpath Museum and Department of Biology, McGill University, 859 Sherbrooke St. W., Montréal, Québec H3A 2K6, Canada

e-mail: andrew.hendry@mcgill.ca


Ecologically dependent reproductive isolation (EDRI) is the decrease in gene flow that occurs when adaptive divergence reduces the fitness of individuals that move between ecological environments. A particularly simple and perhaps almost universal mechanism contributing to EDRI is natural selection against migrants themselves (i.e. before any selection against their offspring). Here I use single-locus and quantitative-genetic models to examine how quickly this mechanism can contribute to EDRI after the founding of a new population. I find that as long as divergent selection is relatively strong, selection against migrants can make a substantial contribution to EDRI in less than 30 generations. This mechanism is only one of several that might influence EDRI. The addition of other mechanisms, such as habitat choice or selection against hybrids, would presumably accelerate the accumulation of EDRI. Although EDRI is neither complete (some gene flow may still occur) nor unconditional (it depends on the ecological context), it may reduce gene flow to the point that absolute and unconditional reproductive isolation can evolve through other mechanisms. Whenever organisms colonize new ecological environments, selection against migrants may contribute to rapid reductions in gene flow. Future studies of ecological speciation may profit from particular attention to this mechanism of reproductive isolation.

Keywords: adaptive divergence, contemporary evolution, ecological speciation, gene flow, rapid evolution, reinforcement, reproductive isolation.

IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.


        © 2004 Andrew P. Hendry. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.

       Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.

       All copies of abstracts and articles must preserve their copyright notice without modification.