The role of sex separation in neutral speciation
Neutral speciation mechanisms based on isolation by distance and assortative mating, termed topopatric, has recently been shown to describe the observed patterns of abundance distributions and species–area relationships. Previous works have considered this type of process only in the context of hermaphroditic populations. In this work, we extend a hermaphroditic model of topopatric speciation to populations where individuals are explicitly separated into males and females. We show that for a particular carrying capacity, speciation occurs under similar conditions, but the number of species generated is lower than in the hermaphroditic case. As a consequence, the species–area curve has lower exponents, especially at intermediate scales. Evolution results in fewer species having more abundant populations.
KeywordsNeutral speciation Assortative mating Biodiversity patterns Sex separation
We thank Karla Bertrand for helpful comments on the manuscript. This work was supported in part by CNPq and FAPESP.
- Bolnick DI, Kirkpatrick M (2012) The relationship between intraspecific assortative mating and reproductive isolation between divergent populations. Current Zoology 58(3):484–492Google Scholar
- Coyne JA, Orr HA (2004) Speciation. Sinauer Associates, SunderlandGoogle Scholar
- Desjardins-Proulx P, Gravel D (2012) A complex speciation-richness relationship in a simple neutral model. arXiv:1203.3884v1 [q-bio.PE]Google Scholar
- Ewens WJ (1979) Mathematical population genetics I. Theoretical introduction series: biomathematics, Vol. 9. Springer, New YorkGoogle Scholar
- Gavrilets S (2004) Fitness landscapes and the origin of species. Princeton University Press, PrincetonGoogle Scholar
- Gillespie JH (2004) Population genetics: a concise guide. The Johns Hopkins University Press, BaltimoreGoogle Scholar
- Hubbell S (2001) The unified neutral theory of biodiversity and biogeography. Princeton University Press, PrincetonGoogle Scholar
- May R (1975) In: Cody M, Diamond Belknap J (eds) Ecology and evolution of communities. Harvard University Press, CambridgeGoogle Scholar
- Mayr E (1955) In: Arai R, Kato M, Doi Y (eds) Biodiversity and evolution. National Science Museum Foundation, TokyoGoogle Scholar
- Mayr E (1988) Toward a new philosophy of biology. Harvard University Press, CambridgeGoogle Scholar
- Templeton A (1989) In: Otte D, Endler J (eds) Speciation and its consequences. Sinauer Associates, Sunderland, pp 3–27Google Scholar
- Thornhill NW (1993) The natural history of inbreeding and outbreeding: theoretical and empirical perspectives. The University of Chicago Press, ChicagoGoogle Scholar