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Supplementary material from "Shifting effects of host physiological condition following pathogen establishment"

Posted on 2023-02-22 - 08:43
Understanding host persistence with emerging pathogens is essential for conserving populations. Hosts may initially survive pathogen invasions through pre-adaptive mechanisms. However, whether pre-adaptive traits are directionally selected to increase in frequency depends on the heritability and environmental dependence of the trait and the costs of trait maintenance. Body condition is likely an important pre-adaptive mechanism aiding in host survival, although can be seasonally variable in wildlife hosts. We used data collected over 7 years on bat body mass, infection and survival to determine the role of host body condition during the invasion and establishment of the emerging disease, white-nose syndrome. We found that when the pathogen first invaded, bats with higher body mass were more likely to survive, but this effect dissipated following the initial epizootic. We also found that heavier bats lost more weight overwinter, but fat loss depended on infection severity. Lastly, we found mixed support that bat mass increased in the population after pathogen arrival; high annual plasticity in individual bat masses may have reduced the potential for directional selection. Overall, our results suggest that some factors that contribute to host survival during pathogen invasion may diminish over time and are potentially replaced by other host adaptations.

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Biology Letters

AUTHORS (11)

Kate E. Langwig
A. Marm Kilpatrick
Macy J. Kailing
Nichole Laggan
J. Paul White
Heather M. Kaarakka
Jennifer A. Redell
John E. DePue
Katy L. Parise
Jeffrey T. Foster
Joseph R. Hoyt
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