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The risk of competitive exclusion during evolutionary branching: Effects of resource variability, correlation and autocorrelation.

Johansson, Jacob LU ; Ripa, Jörgen LU and Kuckländer, Nina (2010) In Theoretical Population Biology 77. p.95-104
Abstract
Evolutionary branching has been suggested as a mechanism to explain ecological speciation processes. Recent studies indicate however that demographic stochasticity and environmental fluctuations may prevent branching through stochastic competitive exclusion. Here we extend previous theory in several ways; we use a more mechanistic ecological model, we incorporate environmental fluctuations in a more realistic way and we include environmental autocorrelation in the analysis. We present a single, comprehensible analytical result which summarizes most effects of environmental fluctuations on evolutionary branching driven by resource competition. Corroborating earlier findings, we show that branching may be delayed or impeded if the underlying... (More)
Evolutionary branching has been suggested as a mechanism to explain ecological speciation processes. Recent studies indicate however that demographic stochasticity and environmental fluctuations may prevent branching through stochastic competitive exclusion. Here we extend previous theory in several ways; we use a more mechanistic ecological model, we incorporate environmental fluctuations in a more realistic way and we include environmental autocorrelation in the analysis. We present a single, comprehensible analytical result which summarizes most effects of environmental fluctuations on evolutionary branching driven by resource competition. Corroborating earlier findings, we show that branching may be delayed or impeded if the underlying resources have uncorrelated or negatively correlated responses to environmental fluctuations. There is also a strong impeding effect of positive environmental autocorrelation, which can be related to results from recent experiments on adaptive radiation in bacterial microcosms. In addition, we find that environmental fluctuations can lead to cycles of repeated branching and extinction. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Theoretical Population Biology
volume
77
pages
95 - 104
publisher
Academic Press
external identifiers
  • wos:000275028100002
  • scopus:75349096224
ISSN
1096-0325
DOI
10.1016/j.tpb.2009.10.007
project
BECC
language
English
LU publication?
yes
id
1718f819-e81f-42e9-9c6a-dc89d153947b (old id 1512186)
date added to LUP
2009-12-01 08:33:42
date last changed
2018-05-29 10:42:43
@article{1718f819-e81f-42e9-9c6a-dc89d153947b,
  abstract     = {Evolutionary branching has been suggested as a mechanism to explain ecological speciation processes. Recent studies indicate however that demographic stochasticity and environmental fluctuations may prevent branching through stochastic competitive exclusion. Here we extend previous theory in several ways; we use a more mechanistic ecological model, we incorporate environmental fluctuations in a more realistic way and we include environmental autocorrelation in the analysis. We present a single, comprehensible analytical result which summarizes most effects of environmental fluctuations on evolutionary branching driven by resource competition. Corroborating earlier findings, we show that branching may be delayed or impeded if the underlying resources have uncorrelated or negatively correlated responses to environmental fluctuations. There is also a strong impeding effect of positive environmental autocorrelation, which can be related to results from recent experiments on adaptive radiation in bacterial microcosms. In addition, we find that environmental fluctuations can lead to cycles of repeated branching and extinction.},
  author       = {Johansson, Jacob and Ripa, Jörgen and Kuckländer, Nina},
  issn         = {1096-0325},
  language     = {eng},
  pages        = {95--104},
  publisher    = {Academic Press},
  series       = {Theoretical Population Biology},
  title        = {The risk of competitive exclusion during evolutionary branching: Effects of resource variability, correlation and autocorrelation.},
  url          = {http://dx.doi.org/10.1016/j.tpb.2009.10.007},
  volume       = {77},
  year         = {2010},
}