The influence of related and unrelated co-infections on parasite dynamics and virulence View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2018-02

AUTHORS

A. M. Gleichsner, K. Reinhart, D. J. Minchella

ABSTRACT

Many parasitic infections increase the morbidity and mortality of host populations. Interactions between co-infecting parasites can influence virulence, the damage done to a host. Previous studies investigating the impacts of parasite co-infection on hosts have been limited by their inability to control parasite dosage, use consistent virulence metrics, or verify co-infection status. This study used molecular tools, known infection dosage, and multiple assessments over time to test whether parasite relatedness can predict virulence in co-infections, as well as whether competitive interactions between different parasite strains within a host are predictable over time. In addition, we examined the impacts of other parasite traits, such as infectivity, as alternative predictors of virulence and competition outcomes. Hosts with single-strain (related) parasite infections were found to have lower virulence in terms of host and parasite reproduction, supporting kin selection predictions. However, these infections also resulted in higher host mortality. We argue that mortality should not be used as a measurement of virulence in parasite systems that castrate hosts. Hosts were more susceptible to mixed strain (unrelated) parasite infections, indicating that co-infections may make resistance more costly to hosts. Co-infections were dynamic, with changes in parasite dominance over the course of the infection. The more infective parasite strain appeared to suppress the less infective strain, ultimately increasing host longevity. Our findings suggest that unrelated, or more diverse, parasite infections are associated with higher virulence, but that studies must consider their methodology and possible alternative explanations beyond kin selection to understand virulence outcomes. More... »

PAGES

555-564

Journal

TITLE

Oecologia

ISSUE

2

VOLUME

186

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00442-017-4035-9

DOI

http://dx.doi.org/10.1007/s00442-017-4035-9

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1099702711

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/29234885


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