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

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  • Johansson, Jacob
  • Ripa, Jörgen
  • Kuckländer, Nina

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.

Suggested Citation

  • Johansson, Jacob & Ripa, Jörgen & Kuckländer, Nina, 2010. "The risk of competitive exclusion during evolutionary branching: Effects of resource variability, correlation and autocorrelation," Theoretical Population Biology, Elsevier, vol. 77(2), pages 95-104.
  • Handle: RePEc:eee:thpobi:v:77:y:2010:i:2:p:95-104
    DOI: 10.1016/j.tpb.2009.10.007
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    References listed on IDEAS

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    1. M. Doebeli & U. Dieckmann, 2000. "Evolutionary Branching and Sympatric Speciation Caused by Different Types of Ecological Interactions," Working Papers ir00040, International Institute for Applied Systems Analysis.
    2. U. Dieckmann & R. Law, 1996. "The Dynamical Theory of Coevolution: A Derivation from Stochastic Ecological Processes," Working Papers wp96001, International Institute for Applied Systems Analysis.
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    Cited by:

    1. Svardal, Hannes & Rueffler, Claus & Hermisson, Joachim, 2015. "A general condition for adaptive genetic polymorphism in temporally and spatially heterogeneous environments," Theoretical Population Biology, Elsevier, vol. 99(C), pages 76-97.
    2. Hernán Darío Toro-Zapata & Carlos Andrés Trujillo-Salazar & Fabio Dercole & Gerard Olivar-Tost, 2021. "Coffee Berry Borer (Hypothenemus hampei) and its role in the evolutionary diversification of the coffee market," Journal of Evolutionary Economics, Springer, vol. 31(3), pages 1029-1063, July.
    3. van Leeuwen, Edwin & Etienne, Rampal S., 2013. "Caught in the middle: Asymmetric competition causes high variance in intermediate trait abundances," Theoretical Population Biology, Elsevier, vol. 85(C), pages 26-37.

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