Drivers of variation in species impacts for a multi-host fungal disease of bats

Kate E. Langwig, Winifred F. Frick, Joseph R. Hoyt, Katy L. Parise, Kevin P. Drees, Thomas H. Kunz, Jeffrey T. Foster, A. Marm Kilpatrick

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Disease can play an important role in structuring species communities because the effects of disease vary among hosts; some species are driven towards extinction, while others suffer relatively little impact. Why disease impacts vary among host species remains poorly understood for most multi-host pathogens, and factors allowing less-susceptible species to persist could be useful in conserving highly affected species. White-nose syndrome (WNS), an emerging fungal disease of bats, has decimated some species while sympatric and closely related species have experienced little effect. We analysed data on infection prevalence, fungal loads and environmental factors to determine how variation in infection among sympatric host species influenced the severity of WNS population impacts. Intense transmission resulted in almost uniformly high prevalence in all species. By contrast, fungal loads varied over 3 orders of magnitude among species, and explained 98% of the variation among species in disease impacts. Fungal loads increased with hibernating roosting temperatures, with bats roosting at warmer temperatures having higher fungal loads and suffering greater WNS impacts. We also found evidence of a threshold fungal load, above which the probability of mortality may increase sharply, and this threshold was similar for multiple species. This study demonstrates how differences in behavioural traits among species—in this case microclimate preferences—that may have been previously adaptive can be deleterious after the introduction of a new pathogen. Management to reduce pathogen loads rather than exposure may be an effective way of reducing disease impact and preventing species extinctions.

Original languageEnglish (US)
Article number20150456
JournalPhilosophical Transactions of the Royal Society B: Biological Sciences
Volume371
Issue number1709
DOIs
StatePublished - Dec 5 2016

Keywords

  • Emerging infectious disease
  • Geomyces destructans
  • Multi-host pathogen
  • Myotis lucifugus
  • White-nose syndrome
  • Wildlife disease

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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    Langwig, K. E., Frick, W. F., Hoyt, J. R., Parise, K. L., Drees, K. P., Kunz, T. H., Foster, J. T., & Kilpatrick, A. M. (2016). Drivers of variation in species impacts for a multi-host fungal disease of bats. Philosophical Transactions of the Royal Society B: Biological Sciences, 371(1709), [20150456]. https://doi.org/10.1098/rstb.2015.0456