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Sexual selection enables long-term coexistence despite ecological equivalence


Empirical data indicate that sexual preferences are critical for maintaining species boundaries1,2,3,4, yet theoretical work has suggested that, on their own, they can have only a minimal role in maintaining biodiversity5,6,7,8,9. This is because long-term coexistence within overlapping ranges is thought to be unlikely in the absence of ecological differentiation9. Here we challenge this widely held view by generalizing a standard model of sexual selection to include two ubiquitous features of populations with sexual selection: spatial variation in local carrying capacity, and mate-search costs in females. We show that, when these two features are combined, sexual preferences can single-handedly maintain coexistence, even when spatial variation in local carrying capacity is so slight that it might go unnoticed empirically. This theoretical study demonstrates that sexual selection alone can promote the long-term coexistence of ecologically equivalent species with overlapping ranges, and it thus provides a novel explanation for the maintenance of species diversity.

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Figure 1: Sexual selection enables long-term coexistence of ecologically equivalent species.
Figure 2: Loss and maintenance of coexistence.
Figure 3: Conditions for long-term coexistence.
Figure 4: Mosaic sympatry.


  1. 1

    Eberhard, W. G. Sexual Selection and Animal Genitalia (Harvard Univ. Press, 1985)

    Book  Google Scholar 

  2. 2

    Seehausen, O. & van Alphen, J. J. M. Can sympatric speciation by disruptive sexual selection explain rapid evolution of cichlid diversity in Lake Victoria? Ecol. Lett. 2, 262–271 (1999)

    Article  Google Scholar 

  3. 3

    Gray, D. A. & Cade, W. H. Sexual selection and speciation in field crickets. Proc. Natl Acad. Sci. USA 97, 14449–14454 (2000)

    CAS  Article  ADS  Google Scholar 

  4. 4

    Wilson, A. B., Noack-Kunnmann, K. & Meyer, A. Incipient speciation in sympatric Nicaraguan crater lake cichlid fishes: sexual selection versus ecological diversification. Proc. R. Soc. Lond. B 267, 2133–2141 (2000)

    CAS  Article  Google Scholar 

  5. 5

    Turner, G. F. & Burrows, M. T. A model of sympatric speciation by sexual selection. Proc. R. Soc. Lond. B 260, 287–292 (1995)

    Article  ADS  Google Scholar 

  6. 6

    Panhuis, T. M., Butlin, R., Zuk, M. & Tregenza, T. Sexual selection and speciation. Trends Ecol. Evol. 16, 364–371 (2001)

    Article  Google Scholar 

  7. 7

    van Doorn, G. S., Dieckmann, U. & Weissing, F. J. Sympatric speciation by sexual selection: a critical reevaluation. Am. Nat. 163, 709–725 (2004)

    Article  Google Scholar 

  8. 8

    Johansson, J. & Ripa, J. Will sympatric speciation fail due to stochastic competitive exclusion? Am. Nat. 168, 572–578 (2006)

    Article  Google Scholar 

  9. 9

    Weissing, F. J., Edelaar, P. & van Doorn, G. S. Adaptive speciation theory: a conceptual review. Behav. Ecol. Sociobiol. 65, 461–480 (2011)

    Article  Google Scholar 

  10. 10

    Schluter, D. The Ecology of Adaptive Radiation (Oxford Univ. Press, 2000)

    Google Scholar 

  11. 11

    Fisher, R. A. The Genetical Theory of Natural Selection (Clarendon Press, 1930)

    Book  Google Scholar 

  12. 12

    Lande, R. Models of speciation by sexual selection on polygenic traits. Proc. Natl Acad. Sci. USA 78, 3721–3725 (1981)

    MathSciNet  CAS  Article  ADS  Google Scholar 

  13. 13

    Lande, R. Rapid origin of sexual isolation and character divergence in a cline. Evolution 36, 213–223 (1982)

    Article  Google Scholar 

  14. 14

    Kirkpatrick, M. Sexual selection and the evolution of female choice. Evolution 36, 1–12 (1982)

    Article  Google Scholar 

  15. 15

    Seger, J. Unifying genetic models for the evolution of female choice. Evolution 39, 1185–1193 (1985)

    Article  Google Scholar 

  16. 16

    Payne, R. J. H. & Krakauer, D. C. Sexual selection, space, and speciation. Evolution 51, 1–9 (1997)

    Article  Google Scholar 

  17. 17

    Mallet, J. Hybridization, ecological races and the nature of species: empirical evidence for the ease of speciation. Phil. Trans. R. Soc. B 363, 2971–2986 (2008)

    Article  Google Scholar 

  18. 18

    Mallet, J., Meyer, A., Nosil, P. & Feder, J. L. Space, sympatry and speciation. J. Evol. Biol. 22, 2332–2341 (2009)

    CAS  Article  Google Scholar 

  19. 19

    Barton, N. H. & Hewitt, G. M. Analysis of hybrid zones. Annu. Rev. Ecol. Syst. 16, 113–148 (1985)

    Article  Google Scholar 

  20. 20

    Barton, N. H. & Hewitt, G. M. Adaptation, speciation and hybrid zones. Nature 341, 497–503 (1989)

    CAS  Article  ADS  Google Scholar 

  21. 21

    Dieckmann, U. in Adaptive Speciation (eds Dieckmann, U., Metz, J. A. J., Doebeli, M. & Tautz, D. ) 306–307 (Cambridge Univ. Press, 2004)

    Book  Google Scholar 

  22. 22

    Seehausen, O., van Alphen, J. J. M. & Witte, F. Cichlid fish diversity threatened by eutrophication that curbs sexual selection. Science 277, 1808–1811 (1997)

    CAS  Article  Google Scholar 

  23. 23

    Hollocher, H., Ting, C., Pollack, F. & Wu, C. Incipient speciation by sexual isolation in Drosophila melanogaster: variation in mating preference and correlation between sexes. Evolution 51, 1175–1181 (1997)

    PubMed  Google Scholar 

  24. 24

    Feulner, P. G. D., Kirschbaum, F. & Tiedemann, R. Adaptive radiation in the Congo River: an ecological speciation scenario for African weakly electric fish (Teleostei; Mormyridae; Campylomormyrus). J. Physiol. (Paris) 102, 340–346 (2008)

    Article  Google Scholar 

  25. 25

    Ryan, M. J. & Wilczynski, W. Coevolution of sender and receiver: effect on local mate preference in cricket frogs. Science 240, 1786–1788 (1988)

    CAS  Article  ADS  Google Scholar 

  26. 26

    Tregenza, T., Pritchard, V. L. & Butlin, R. K. The origins of premating reproductive isolation: testing hypotheses in the grasshopper Chorthippus parallelus . Evolution 54, 1687–1698 (2000)

    CAS  Article  Google Scholar 

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We thank J. S. Brown, R. G. FitzJohn, D. E. Irwin, J. Ohlberger, J. L. Payne, A. Pomiankowski and G. S. van Doorn for discussions. Funding was provided by a Natural Sciences and Engineering Research Council (Canada) grant to L.K.M. (CGS-D) and S.P.O. (Discovery Grant). L.K.M. received additional support from the European Science Foundation Research Networking Programme ‘Frontiers of Speciation Research’. R.M. and U.D. gratefully acknowledge support by the Vienna Science and Technology Fund (WWTF). U.D. received additional financial support from the European Commission, the European Science Foundation, the Austrian Science Fund and the Austrian Ministry of Science and Research.

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U.D. and L.K.M. conceived this project. L.K.M., R.M., S.P.O. and U.D. discussed and designed the model. L.K.M. implemented the model with input from R.M., analysed the results together with R.M., S.P.O. and U.D. and prepared the manuscript. L.K.M., R.M., S.P.O. and U.D. jointly edited the manuscript.

Corresponding author

Correspondence to Leithen K. M’Gonigle.

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The authors declare no competing financial interests.

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M’Gonigle, L., Mazzucco, R., Otto, S. et al. Sexual selection enables long-term coexistence despite ecological equivalence. Nature 484, 506–509 (2012).

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