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Theory-Based EcologyA Darwinian approach$
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Liz Pásztor, Zoltán Botta-Dukát, Gabriella Magyar, Tamás Czárán, and Géza Meszéna

Print publication date: 2016

Print ISBN-13: 9780199577859

Published to Oxford Scholarship Online: August 2016

DOI: 10.1093/acprof:oso/9780199577859.001.0001

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Robust coexistence and population regulation

Robust coexistence and population regulation

Chapter:
(p.170) Chapter 9 Robust coexistence and population regulation
Source:
Theory-Based Ecology
Author(s):

Liz Pásztor

Zoltán Botta-Dukát

Gabriella Magyar

Tamás Czárán

Géza Meszéna

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199577859.003.0009

The larger the difference between competing varieties in their method of growth regulation the more robust their coexistence. Stable coexistence assumes frequency-dependent fitness with the advantage of the rare variant, which is empirically demonstrated for alleles, clones, and species. This principle is demonstrated in the implicit Lotka–Volterra model and in the explicit resource competition model of Tilman, and is generalized for arbitrary density-dependence. The generalized competitive exclusion principle states that a necessary condition for stable coexistence is that there be at least as many regulating factors as variants. Asymmetric competition for space through colonization-competition trade-offs, and for light via the trade-off between the vertical growth of trees and the reproductive potential also provides opportunities for coexistence. Trophic interactions may lead to complex population dynamics, as demonstrated by chemostat examples and the Rosenzweig–MacArthur model. Discussion of the conditions for coexistence in the food web context closes the chapter.

Keywords:   stable coexistence, frequency-dependent fitness, rare advantage, negative frequency-dependent selection, stabilizing mechanism, asymmetric competition, colonization-competition trade-off, Rosenzweig–MacArhur model, complex dynamics, food web

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