Evolution restricts the coexistence of specialists and generalists: The role of trade-off structure

Egas M, Dieckmann U, & Sabelis MW (2004). Evolution restricts the coexistence of specialists and generalists: The role of trade-off structure. The American Naturalist 163 (4): 518-531. DOI:10.1086/382599.

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Abstract

Environmental variability and adaptive foraging behavior have been shown to favor coexistence of specialists and generalists on an ecological timescale. This leaves unaddressed the question of whether such coexistence can also be expected on an evolutionary timescale. In this article, we study the attainability, through gradual evolution, of specialist-generalist coexistence, as well as the evolutionary stability of such communities when allowing for immigration. Our analysis shows that the potential for specialist-generalist coexistence is much more restricted than originally thought and strongly depends on the trade-off structure assumed. We establish that ecological coexistence is less likely for species facing a trade-off between per capita reproduction in different habitats than when the trade-off acts on carrying capacities alone. We also demonstrate that coexistence is evolutionarily stable whenever it is ecologically stable but that in most cases, such coexistence cannot be reached through gradual evolution. We conclude that an evolutionarily stable community of specialists and generalists may be created only through immigration from elsewhere or through mutations of large effect. Our results highlight that trade-offs in fitness-determining traits can have counterintuitive effects on the evolution of specialization.

Item Type: Article
Uncontrolled Keywords: Coexistence; evolution; foraging behavior; specialization; temporal heterogeneity; trade-off structure
Research Programs: Adaptive Dynamics Network (ADN)
Bibliographic Reference: The American Naturalist; 163(4):518-531 (April 2004)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 02:16
Last Modified: 07 Sep 2016 11:54
URI: http://pure.iiasa.ac.at/7160

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