After the epidemic: ongoing declines, stabilizations and recoveries inamphibians afflicted by chytridiomycosis

Scheele, Ben C., Skerratt, Lee F., Grogan, Laura F., Hunter, David A., Clemann, Nick, McFadden, Michael, Newell, David, Hoskin, Conrad J., Gillespie, Graeme R., Heard, Geoffery W., Brannelly, Laura, Roberts, Alexandra A., and Berger, Lee (2017) After the epidemic: ongoing declines, stabilizations and recoveries inamphibians afflicted by chytridiomycosis. Biological Conservation, 206. pp. 37-46.

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Abstract

The impacts of pathogen emergence in naïve hosts can be catastrophic, and pathogen spread now ranks as a major threat to biodiversity. However, pathogen impacts can persist for decades after epidemics and produce variable host outcomes. Chytridiomycosis in amphibians (caused by the fungal pathogen Batrachochytrium dendrobatidis, Bd) is an exemplar, with impacts ranging from rapid population crashes and extinctions, to population declines and subsequent recoveries. Here, we investigate long-term impacts associated with chytridiomycosis in Australia. We conducted a continent-wide assessment of the disease, reviewing data collected since the arrival of Bd in about 1978, to assess and characterize mechanisms driving past, present and future impacts. We found chytridiomycosis to be implicated in the extinction or decline of 43 of Australia's 238 amphibian species. Population trajectories of declined species are highly variable; six species are experiencing ongoing declines, eight species are apparently stable and 11 species are recovering. Our results highlight that while some species are expanding, Bd continues to threaten species long after its emergence. Australian case-studies and synthesis of the global chytridiomycosis literature suggests that amphibian reservoir hosts are associated with continued declines in endemically infected populations, while population stability is promoted by environmental conditions that restrict Bd impact, and maintenance of high recruitment capacity that can offset mortality. Host genetic adaptation or decreased pathogen virulence may facilitate species recovery, but neither has been empirically demonstrated. Understanding processes that influence Bd-host dynamics and population persistence is crucial for assessing species extinction risk and identifying strategies to conserve disease-threatened species.

Item ID: 46928
Item Type: Article (Refereed Research - C1)
Keywords: amphibian; Chytrid fungus; extinction; recovery; wildlife disease
ISSN: 1873-2917
Funders: Australian Research Council (ARC), Queensland Accelerate Fellowship (QAF), NSW Office of Environment and Heritage, Queensland Department of Environment and Heritage Protection (QDEHP), Taronga Conservation Science Initiative
Projects and Grants: ARC FT100100375, LP110200240 & DP120100811, QAF 14-218
Date Deposited: 24 Jan 2017 22:02
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060207 Population Ecology @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0707 Veterinary Sciences > 070704 Veterinary Epidemiology @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 50%
96 ENVIRONMENT > 9604 Control of Pests, Diseases and Exotic Species > 960405 Control of Pests, Diseases and Exotic Species at Regional or Larger Scales @ 50%
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