Abstract
Sex-biased parasitism highlights potentially divergent approaches to parasite resistance resulting in differing energetic trade-offs for males and females; however, trade-offs between immunity and self-maintenance could also depend on host body condition. We investigated these relationships in the big brown bat, Eptesicus fuscus, to determine if host sex or body condition better predicted parasite resistance, if testosterone levels predicted male parasite burdens, and if immune parameters could predict male testosterone levels. We found that male and female hosts had similar parasite burdens and female bats scored higher than males in only one immunological measure. Top models of helminth burden revealed interactions between body condition index and agglutination score as well as between agglutination score and host sex. Additionally, the strength of the relationships between sex, agglutination, and helminth burden is affected by body condition. Models of male parasite burden provided no support for testosterone predicting helminthiasis. Models that best predicted testosterone levels did not include parasite burden but instead consistently included month of capture and agglutination score. Thus, in our system, body condition was a more important predictor of immunity and worm burden than host sex.
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Acknowledgments
The authors would like to thank J.W. Warburton, C.J. Warburton, D.J. Clarke, B.A. Hines, S.M. Warner, D.M. Courtney, B.K. Hubbard, L.M. Vanbladeren, H.E. LaFore, and E.M. Freed for their assistance in the field and in the lab. We appreciate the assistance of F.A. Jiménez in nematode identification. We would also like to thank J. Glatz for creating a map of our sites. Finally, we thank S.L. Kohler, S.A. Gill, and J.M. Lotz as well as two anonymous reviewers for their constructive comments on earlier versions of the manuscript. Funding was provided by the American Society of Mammalogists, the American Society of Parasitologists, the Annual Midwestern Conference of Parasitologists, and Western Michigan University.
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Warburton, E.M., Pearl, C.A. & Vonhof, M.J. Relationships between host body condition and immunocompetence, not host sex, best predict parasite burden in a bat-helminth system. Parasitol Res 115, 2155–2164 (2016). https://doi.org/10.1007/s00436-016-4957-x
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DOI: https://doi.org/10.1007/s00436-016-4957-x