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Effects of Competitive Asymmetry on a Local Density Model of Plant Interference by S.W. Pacala; J. Weiner is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Effects of Competitive Asymmetry on a Local Density Model of Plant Interference about?

Although competition between plants is usually asymmetric (i.e. larger plants have a disproportionate effect on smaller plants) almost all models of plant competition at the local level have assumed symmetric competition. We add a simple version of competitive asymmetry to the local density neighborhood models of plant interference and population dynamics developed by Pacala & Silander (1985, Am. Nat. 125, 385-411; 1987, Oikos 48, 217-224) by assuming that plants within a neighborhood can be put in a linear dominance hierarchy based upon their initial size. The size of a focal plant is a function of the number of dominant and the number of subordinate neighbors within its neighborhood, with subordinate neighbors having less of an effect than dominant ones. Asymmetry prevents precipitous changes in focal plant size with changes in local density, making the relationship between focal plant size and local density hyperbolic, even if the symmetric model is not hyperbolic. Thus, asymmetry makes the model conform to the law of constant final yield, irrespective of the form of the relationship between plant size and local crowding. Asymmetry also prevents population dynamic oscillations i

Who reads Effects of Competitive Asymmetry on a Local Density Model of Plant Interference?

Author

S.W. Pacala; J. Weiner

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-5193)

Published

1991

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)