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

Research output: Contribution to journalReview articlepeer-review


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.
Original languageEnglish
Pages (from-to)229-240
JournalOrganisms Diversity & Evolution
Issue number3
Publication statusPublished - 2012

Subject classification (UKÄ)

  • Biological Sciences

Free keywords

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


Dive into the research topics of 'Non-ecological speciation, niche conservatism and thermal adaptation: how are they connected?'. Together they form a unique fingerprint.

Cite this