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| Research article summary (published 30 Jan 2006): |
Heterogeneity shapes invasion: host size and environment influence susceptibility to a nonnative pathogen.
Full Abstract
Theoretical study of invasion dynamics has suggested that spatial heterogeneity should strongly influence the rate and extent of spreading organisms. However, empirical support for this prediction is scant, and the importance of understanding heterogeneity for real-world systems has remained ambiguous. This study quantified the influence of host and environmental heterogeneity on the dynamics of a 19-year disease invasion by the exotic and fatal pathogen, Phytophthora lateralis, within a stream population of its host tree, Port Orford cedar (Chamaecyparis lawsoniana). Using dendrochronology, we reconstructed the invasion history along a 1350-m length of infected stream, which serves as the only route of pathogen dispersal. Contrary to theoretical predictions, the temporal progression of the disease invasion was not related to a host's downstream spatial position, but instead was determined by two sources of heterogeneity:
host size and proximity to the stream channel. These sources of heterogeneity influenced both the epidemic and endemic dynamics of this pathogen invasion. This analysis provides empirical support for the influence of heterogeneity on the invasion dynamics of a commercially important forest pathogen and highlights the need to incorporate such natural variability into both invasion theory and methods aimed at controlling future spread.
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Author information
Author/s: Kauffman, Matthew J (MJ); Jules, Erik S (ES);
Affiliation: Department of Environmental Studies, University of California, Santa Cruz, California 95064, USA. matt.kauffman(-atsign-)mso.umt.edu
Journal and publication information
Publication Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.
Journal: Ecological applications : a publication of the Ecological Society of America (Ecol Appl), published in United States. (Language: eng)
Reference: 2006-Feb; vol 16 (issue 1) : pp 166-75
Dates: Created 2006/05/18; Completed 2006/09/26; Revised 2008/11/21;
PMID: 16705970, status: MEDLINE (last retrieval date: 12/26/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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