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Innate immunity and environmental correlates of Haemoproteus prevalence and intensity in an opportunistic breeder

Published online by Cambridge University Press:  21 February 2018

Elizabeth M. Schultz*
Affiliation:
University of California, Davis, One Shields Ave, Davis, California 95616, USA
Jamie M. Cornelius
Affiliation:
Eastern Michigan University, 900 Oakwood St, Ypsilanti, Michigan 48198, USA
Dustin G. Reichard
Affiliation:
Ohio Wesleyan University, 61 S Sandusky St, Delaware, Ohio 43015, USA
Kirk C. Klasing
Affiliation:
University of California, Davis, One Shields Ave, Davis, California 95616, USA
Thomas P. Hahn
Affiliation:
University of California, Davis, One Shields Ave, Davis, California 95616, USA
*
Author for correspondence: Elizabeth M. Schultz, E-mail: [email protected]

Abstract

While parasite infection can have substantial fitness consequences in organisms, the predictors of parasite prevalence and intensity are often complex and vary depending on the host species. Here, we examined correlates of Haemoproteus (a common malaria parasite) prevalence and intensity in an opportunistically breeding songbird, the red crossbill (Loxia curvirostra). Specifically, we quantified Haemoproteus prevalence and intensity in crossbills caught in the Grand Teton National Park from 2010 to 2013. We found that parasite prevalence varies seasonally and across years, with the highest number of infected individuals occurring in the summer, although there was variation across summers sampled, and that prevalence was positively related to annual mean cone crop sizes (a measure of crossbill food abundance) and daily ambient temperature (a correlate of vector abundance). Parasite intensity was significantly and positively related to one measure of innate immunity, leucocyte counts per blood volume. Finally, neither crossbill age, ecomorph, nor sex had significant effects on parasite infection intensity; however, parasite prevalence did significantly vary among ecomorph and age classes. These results support the interpretation that a combination of physiological (specifically immune activity) and environmental factors affects parasite prevalence and infection intensity in this opportunistically breeding avian species.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2018 

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Footnotes

*

Current Address: Kenyon College, 103 College Rd, Gambier, Ohio 43022, USA

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