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Host allometry influences the evolution of parasite host-generalism: theory and meta-analysis

Walker, Josephine G., Hurford, Amy, Cable, Joanne, Ellison, Amy, Price, Stephen J. and Cressler, Clayton E. 2017. Host allometry influences the evolution of parasite host-generalism: theory and meta-analysis. Philosophical Transactions - Royal Society of London Series B Biological Sciences 372 (1719) , 20160089. 10.1098/rstb.2016.0089

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Abstract

Parasites vary widely in the diversity of hosts they infect: some parasite species are specialists - infecting just a single host species, while others are generalists, capable of infecting many. Understanding the factors that drive parasite host-generalism is of basic biological interest, but also directly relevant to predicting disease emergence in new host species, identifying parasites that are likely to have unidentified additional hosts, and assessing transmission risk. Here, we use mathematical models to investigate how variation in host body size and environmental temperature affect the evolution of parasite host-generalism. We predict that parasites are more likely to evolve a generalist strategy when hosts are large-bodied, when variation in host body size is large, and in cooler environments. We then explore these predictions using a newly updated database of over 20,000 fish-macroparasite associations. Within the database we see some evidence supporting these predictions, but also highlight mismatches between theory and data. By combining these two approaches, we establish a theoretical basis for interpreting empirical data on parasites' host specificity and identify key areas for future work that will help untangle the drivers of parasite host-generalism.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Uncontrolled Keywords: fish parasites, transmission, host range, specialism, invasion analysis
Publisher: The Royal Society
ISSN: 0962-8436
Date of First Compliant Deposit: 23 February 2017
Date of Acceptance: 15 November 2016
Last Modified: 04 Jun 2017 09:43
URI: http://orca-mwe.cf.ac.uk/id/eprint/98510

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