Evol Ecol Res 6: 927-935 (2004)     Full PDF if your library subscribes.

Divergence revealed by population crosses in the red flour beetle Tribolium castaneum

Fathi A. Attia‡ and Tom Tregenza*

Ecology and Evolution Group, School of Biology, University of Leeds, Leeds LS2 9JT, UK

Author to whom all correspondence should be addressed.
e-mail: t.tregenza@leeds.ac.uk


There is growing interest in the potential for population divergence (and hence speciation) to be driven by co-evolutionary arms races due to conflicts of interest between the sexes over matings and investment in offspring. It has been suggested that the signature of sexually antagonistic co-evolution may be revealed in crosses between populations through females showing the weakest response to males from their own population compared with males from other populations. The rationale behind this prediction is that females will not have been able to evolve counter-adaptations to manipulative signals from males with which they have not co-evolved. Recent theoretical treatments suggest that this prediction is not strictly exclusive to the sexual conflict theory, but it remains the case that population crosses can provide insights into the evolution of mate choice within populations. We describe crosses between six populations of the red flour beetle Tribolium castaneum. Although successful matings are no more or less likely between populations compared to within populations, females do increase their oviposition rate in response to males from other populations, relative to males from their own population. Our results are therefore consistent with the proposition that sexual conflict has driven population divergence in this species. However, we argue that the available evidence is more supportive of the hypothesis that increased female investment in response to males from other populations is a side-effect of inbreeding avoidance within populations.

Keywords: cryptic female choice, differential investment, heterosis, inbreeding, outbreeding, sexual conflict, speciation.

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


        © 2004 Tom Tregenza. 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.