Journal
JOURNAL OF THEORETICAL BIOLOGY
Volume 238, Issue 3, Pages 497-504Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtbi.2005.06.006
Keywords
food webs; omnivory; competition; trophic levels
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The ecological concept of omnivory, feeding at more than a single trophic level, is formulated as an intermediate stage between any two of three classical three-dimensional species interaction systems-tritrophic chain, competition, and polyphagy. It is shown that omnivory may be either stabilizing or destabilizing, depending, in part, on the conditions of the parent systems from which it derives. It is further conjectured that the tritrophic to competition gradient cannot be entirely stable, that there must be an instability at some level of intermediate omnivory. (C) 2005 Elsevier Ltd. All rights reserved.
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