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Pathogen Relatedness Affects the Prevalence of Within‐Host Competition

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‡Corresponding author. Address for correspondence: Department of Biology, Amherst College, Amherst, Massachusetts 01002; e‐mail: [email protected].

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Associate Editor: Judith L. Bronstein

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Editor: Michael C. Whitlock

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1. Department of Biology, Indiana University, Bloomington, Indiana 47405;2. Ecologie, Systématique et Evolution, Université Paris‐Sud, Orsay Cedex, France;3. Department of Biology, University of Virginia, Charlottesville, Virginia 22903

Abstract

Although the evolutionary consequences of within‐host competition among pathogens have been examined extensively, there exists a critical gap in our understanding of factors determining the prevalence of multiple infections. Here we examine the effects of relatedness among strains of the anther‐smut pathogen Microbotryum violaceum on the probability of multiple infection in its host, Silene latifolia, after sequential inoculations. We found a significantly higher probability of multiple infection when interacting strains were more closely related, suggesting mechanisms of competitive exclusion that are conditional on genotypic characteristics of the strains involved. Pathogen relatedness therefore determines the prevalence of multiple infection in addition to its outcome, with important consequences for our understanding of virulence evolution and pathogen population structure and diversity.

The American Naturalist

Volume 168, Number 1July 2006

Published for The American Society of Naturalists

Article DOI

https://doi.org/10.1086/505770

Views: 49

Citations: 45
Citations are reported from Crossref

History

Received January 23, 2006
Accepted May 9, 2006
Published online June 5, 2006

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