Organisms Diversity & Evolution

, Volume 12, Issue 3, pp 229–240 | Cite as

Non-ecological speciation, niche conservatism and thermal adaptation: how are they connected?

Review

Abstract

During the last decade, the ecological theory of adaptive radiation, and its corollary “ecological speciation”, has been a major research theme in evolutionary biology. Briefly, this theory states that speciation is mainly or largely the result of divergent selection, arising from niche differences between populations or incipient species. Reproductive isolation evolves either as a result of direct selection on mate preferences (e.g. reinforcement), or as a correlated response to divergent selection (“by-product speciation”). Although there are now many tentative examples of ecological speciation, I argue that ecology’s role in speciation might have been overemphasised and that non-ecological and non-adaptive alternatives should be considered more seriously. Specifically, populations and species of many organisms often show strong evidence of niche conservatism, yet are often highly reproductively isolated from each other. This challenges niche-based ecological speciation and reveals partial decoupling between ecology and reproductive isolation. Furthermore, reproductive isolation might often evolve in allopatry before ecological differentiation between taxa or possibly through learning and antagonistic sexual interactions, either in allopatry or sympatry. Here I discuss recent theoretical and empirical work in this area, with some emphasis on odonates (dragonflies and damselflies) and suggest some future avenues of research. A main message from this paper is that the ecology of species differences is not the same as ecological speciation, just like the genetics of species differences does not equate to the genetics of speciation.

Keywords

Mike May Festschrift Calopteryx Learning Learned mate preferences Niche Sexual conflict By-product speciation IR-camera Thermal imaging Ectotherms Sexual isolation 

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Copyright information

© Gesellschaft für Biologische Systematik 2012

Authors and Affiliations

  1. 1.Department of Biology, Evolutionary Ecology Unit, Ecology BuildingLund UniversityLundSweden

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