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Coevolution of Life on HostsIntegrating Ecology and History$
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Dale H. Clayton, Sarah E. Bush, and Kevin P. Johnson

Print publication date: 2015

Print ISBN-13: 9780226302133

Published to Chicago Scholarship Online: May 2016

DOI: 10.7208/chicago/9780226302300.001.0001

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PRINTED FROM CHICAGO SCHOLARSHIP ONLINE (www.chicago.universitypressscholarship.com). (c) Copyright University of Chicago Press, 2019. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CHSO for personal use.date: 18 October 2019

Competition and coadaptation

Competition and coadaptation

(p.106) 6 Competition and coadaptation
Coevolution of Life on Hosts

Dale H. Clayton

Sarah E. Bush

Kevin P. Johnson

University of Chicago Press

The preceding chapters of the book focused on interactions between hosts and parasites. This chapter focuses on competitive interactions between different species of parasites, and the role of the host in mediating those interactions. Parasites do not live in isolation, but are members of diverse parasite communities that share hosts. While no individual harbors all parasites known from that host species, most individuals support more than one species of parasite at a time. The presence of a given parasite species can have a negative effect on other parasites due to competition for limiting resources in or on the shared host. Even parasites that exploit very different parts of a host's body may compete, because each host individual is ultimately a single resource. Interspecific competition can lead to the coadaptation of traits that reduce the intensity of competition. Thus, in addition to coevolving with the host species, parasites coevolve with other parasites that share that same host species. The chapter begins by considering competition between parasite species, in general. It then provides a more detailed overview of competition between species of lice.

Keywords:   competition, displacement, local extinction, community, limiting resource, coadaptation

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