The persistence of host-parasitoid associations in patchy environments. II. Evaluation of field data

S. W. Pacala, M. P. Hassell

Research output: Contribution to journalArticle

98 Scopus citations

Abstract

Introduces a method for estimating the parameters of simple host-parasitoid models from field data relating percent parasitism to local host density per patch. By using these parameters, the coefficient of variation (CV2) of the density of searching parasitoids can be calculated. This quantity is important because a general criterion for heterogeneity to regulate discrete-generation host-parasitoid models is that CV2 >1 (see 92L/04394). The method further allows one to partition CV2 into a host-density-dependent component caused by nonzero covariance between the spatial distributions of the host and parasitoid (HDD), and a component that is independent of host density (HDI). The authors analyzed 34 sets of published data. Heterogeneity is sufficient to regulate the populations (CV2 >1) in a third of the cases. In c90% of the cases in which CV2 >1, the density-independent component of CV2 is considerably more important for population regulation than the direct or inverse density-dependent components. -Authors

Original languageEnglish (US)
Pages (from-to)584-605
Number of pages22
JournalAmerican Naturalist
Volume138
Issue number3
DOIs
StatePublished - Jan 1 1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

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