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Type: Journal article
Title: Grazers and diggers: exploitation competition and coexistence among foragers with different feeding strategies on a single resource
Author: Richards, Shane A.
Nisbet, Roger M.
Wilson, William G.
Possingham, Hugh Philip
Citation: American Naturalist, 2000; 155:266-279
Publisher: University of Chicago Press
Issue Date: 2000
ISSN: 0003-0147
School/Discipline: School of Agriculture, Food and Wine : Plant and Food Science
School of Agriculture, Food and Wine
Statement of
Shane A. Richards, Roger M. Nisbet, William G. Wilson, and Hugh P. Possingham
Abstract: A mathematical model is presented that describes a system where two consumer species compete exploitatively for a single renewable resource. The resource is distributed in a patchy but homogeneous environment; that is, all patches are intrinsically identical. The two consumer species are referred to as diggers and grazers, where diggers deplete the resource within a patch to lower densities than grazers. We show that the two distinct feeding strategies can produce a heterogeneous resource distribution that enables their coexistence. Coexistence requires that grazers must either move faster than diggers between patches or convert the resources to population growth much more efficiently than diggers. The model shows that the functional form of resource renewal within a patch is also important for coexistence. These results contrast with theory that considers exploitation competition for a single resource when the resource is assumed to be well mixed throughout the system.
Keywords: exploitation competition; foraging; coexistence; invasion analysis.
RMID: 0001001274
DOI: 10.1086/303316
Appears in Collections:Agriculture, Food and Wine publications

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