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Will sympatric speciation fail due to stochastic competitive exclusion?

Johansson, Jacob LU and Ripa, Jörgen LU orcid (2006) In American Naturalist 168(4). p.572-578
Abstract
Sympatric speciation requires coexistence of the newly formed species. If divergence proceeds by small mutational steps, the new species utilize almost the same resources initially, and full speciation may be impeded by competitive exclusion in stochastic environments. We investigate this primarily ecological problem of sympatric speciation by studying the population dynamics of a diverging asexual population in a fluctuating environment. Correlation between species responses to environmental fluctuation is assumed to decrease with distance in trait space. Rapidly declining correlation in combination with high environmental variability may delay full speciation or even render it impossible. Stochastic extinctions impeding speciation are... (More)
Sympatric speciation requires coexistence of the newly formed species. If divergence proceeds by small mutational steps, the new species utilize almost the same resources initially, and full speciation may be impeded by competitive exclusion in stochastic environments. We investigate this primarily ecological problem of sympatric speciation by studying the population dynamics of a diverging asexual population in a fluctuating environment. Correlation between species responses to environmental fluctuation is assumed to decrease with distance in trait space. Rapidly declining correlation in combination with high environmental variability may delay full speciation or even render it impossible. Stochastic extinctions impeding speciation are most likely when correlation decays faster than competition, for example, when demographic stochasticity is strong or when divergence is not accompanied by niche separation, such as in speciation driven entirely by sexual selection. Our general theoretical results show an interesting connection between short-term ecological dynamics and long-term, large-scale evolution. (Less)
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author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
American Naturalist
volume
168
issue
4
pages
572 - 578
publisher
University of Chicago Press
external identifiers
  • wos:000240855500014
  • scopus:33750065722
ISSN
0003-0147
DOI
10.1086/507996
language
English
LU publication?
yes
id
7afeed8f-a217-473e-94d8-4297cddd932f (old id 162716)
date added to LUP
2016-04-01 12:30:49
date last changed
2021-01-04 17:41:46
@article{7afeed8f-a217-473e-94d8-4297cddd932f,
  abstract     = {Sympatric speciation requires coexistence of the newly formed species. If divergence proceeds by small mutational steps, the new species utilize almost the same resources initially, and full speciation may be impeded by competitive exclusion in stochastic environments. We investigate this primarily ecological problem of sympatric speciation by studying the population dynamics of a diverging asexual population in a fluctuating environment. Correlation between species responses to environmental fluctuation is assumed to decrease with distance in trait space. Rapidly declining correlation in combination with high environmental variability may delay full speciation or even render it impossible. Stochastic extinctions impeding speciation are most likely when correlation decays faster than competition, for example, when demographic stochasticity is strong or when divergence is not accompanied by niche separation, such as in speciation driven entirely by sexual selection. Our general theoretical results show an interesting connection between short-term ecological dynamics and long-term, large-scale evolution.},
  author       = {Johansson, Jacob and Ripa, Jörgen},
  issn         = {0003-0147},
  language     = {eng},
  number       = {4},
  pages        = {572--578},
  publisher    = {University of Chicago Press},
  series       = {American Naturalist},
  title        = {Will sympatric speciation fail due to stochastic competitive exclusion?},
  url          = {https://lup.lub.lu.se/search/ws/files/2953866/625710.pdf},
  doi          = {10.1086/507996},
  volume       = {168},
  year         = {2006},
}