Pathogen dynamics during invasion and establishment of white-nose syndrome explain mechanisms of host persistence.

Abstract:

:Disease dynamics during pathogen invasion and establishment determine the impacts of disease on host populations and determine the mechanisms of host persistence. Temporal progression of prevalence and infection intensity illustrate whether tolerance, resistance, reduced transmission, or demographic compensation allow initially declining populations to persist. We measured infection dynamics of the fungal pathogen Pseudogymnoascus destructans that causes white-nose syndrome in bats by estimating pathogen prevalence and load in seven bat species at 167 hibernacula over a decade as the pathogen invaded, became established, and some host populations stabilized. Fungal loads increased rapidly and prevalence rose to nearly 100% at most sites within 2 yr of invasion in six of seven species. Prevalence and loads did not decline over time despite huge reductions in colony sizes, likely due to an extensive environmental reservoir. However, there was substantial variation in fungal load among sites with persisting colonies, suggesting that both tolerance and resistance developed at different sites in the same species. In contrast, one species disappeared from hibernacula within 3 yr of pathogen invasion. Variable host responses to pathogen invasion require different management strategies to prevent disease-induced extinction and to facilitate evolution of tolerance or resistance in persisting populations.

journal_name

Ecology

journal_title

Ecology

authors

Frick WF,Cheng TL,Langwig KE,Hoyt JR,Janicki AF,Parise KL,Foster JT,Kilpatrick AM

doi

10.1002/ecy.1706

subject

Has Abstract

pub_date

2017-03-01 00:00:00

pages

624-631

issue

3

eissn

0012-9658

issn

1939-9170

journal_volume

98

pub_type

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