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

Johansson J, Ripa J, & Kucklaender N (2010). The risk of competitive exclusion during evolutionary branching: Effects of resource variability, correlation and autocorrelation. Theoretical Population Biology 77 (2): 95-104. DOI:10.1016/j.tpb.2009.10.007.

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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.

Item Type: Article
Uncontrolled Keywords: Evolutionary branching; Competitive speciation; Stochastic environment; Environmental correlation; Autocorrelation; Competitive exclusion
Research Programs: Evolution and Ecology (EEP)
Postdoctoral Scholars (PDS)
Bibliographic Reference: Theoretical Population Biology; 77(2):95-104 (March 2010) (Published online 04 November 2009)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:44
Last Modified: 25 Feb 2016 09:28
URI: http://pure.iiasa.ac.at/9287

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