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Chytridiomycosis Causes Amphibian Mortality Associated with Population Declines in the Rain Forests of Australia and Central America

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Chytridiomycosis Causes Amphibian Mortality Associated with Population Declines in the Rain Forests of Australia and Central America Proc. Natl. Acad. Sci. USA Vol. 95, pp. 9031–9036, July 1998 Population Biology Chytridiomycosis causes amphibian mortality associated with population declines in the rain forests of Australia and Central America LEE BERGERa,b,c,RICK SPEAREa,PETER DASZAKd,D.EARL GREENe,ANDREW A. CUNNINGHAMf,C.LOUISE GOGGINg, RON SLOCOMBEh,MARK A. RAGANi,ALEX D. HYATTb,KEITH R. MCDONALDj,HARRY B. HINESk,KAREN R. LIPSl, GERRY MARANTELLIm, AND HELEN PARKESb aSchool of Public Health and Tropical Medicine, James Cook University, Townsville, Queensland 4811, Australia; bAustralian Animal Health Laboratory, Commonwealth Scientific and Industrial Research Organization, Ryrie Street, Geelong, Victoria 3220, Australia; dSchool of Life Sciences, Kingston University, Kingston-upon-Thames, Surrey KT1 2EE, United Kingdom; eMaryland Animal Health Laboratory, College Park, MD 20740; fInstitute of Zoology, Zoological Society of London, Regent’s Park, London NW1 4RY, United Kingdom; gCommonwealth Scientific and Industrial Research Organization, Marine Research, Hobart, Tasmania 7001, Australia; hVeterinary Clinical Centre, University of Melbourne, Werribee, Victoria 3030, Australia; iCanadian Institute for Advanced Research, Program in Evolutionary Biology, National Research Council of Canada, Halifax, NS Canada B3H 3Z1; jConservation Strategy Branch, Queensland Department of Environment, Atherton, Queensland 4883, Australia; kConservation Resource Unit, Queensland Department of Environment, Moggill, Queensland 4070, Australia; lDepartment of Zoology, Southern Illinois University, Carbondale, IL 62901-6501; and mAmphibian Research Centre, 15 Suvla Grove, Nth Coburg, Victoria 3058, Australia Edited by Robert May, University of Oxford, Oxford, United Kingdom, and approved May 18, 1998 (received for review March 9, 1998) ABSTRACT Epidermal changes caused by a chytridiomy- primary degraders or saprobes, using substrates such as chitin, cete fungus (Chytridiomycota; Chytridiales) were found in plant detritus, and keratin. Some genera are facultative or sick and dead adult anurans collected from montane rain obligate anaerobes, and many are obligate parasites of fungi, forests in Queensland (Australia) and Panama during mass algae, vascular plants, rotifers, nematodes, or insects. The mortality events associated with significant population de- chytrid reported here is the first member of the phylum clines. We also have found this new disease associated with Chytridiomycota to be recognized as a parasite of the phylum morbidity and mortality in wild and captive anurans from Vertebrata (18). A similar discovery of a chytrid fungus in additional locations in Australia and Central America. This is dying captive dendrobatids in the United States made inde- the first report of parasitism of a vertebrate by a member of pendently and contemporaneously (19) demonstrates that the phylum Chytridiomycota. Experimental data support the chytridiomycosis is widespread in amphibians in the Americas conclusion that cutaneous chytridiomycosis is a fatal disease as well as Australia. of anurans, and we hypothesize that it is the proximate cause of these recent amphibian declines. MATERIALS AND METHODS Collection of Specimens. Large numbers of ill and dead Amphibian population declines in protected habitats are a anurans were found during monitoring programs of amphibian serious global concern (1–3), and although several etiologies populations in decline in Big Tableland, Queensland, Australia have been proposed, none has been substantiated (4–6). (1993–1994) (3 species) (7) and in the Fortuna Forest Reserve, Disease has been hypothesized to be a likely cause, precipi- western Panama (1996–1997) (10 species) (K.R.L., unpub- tated by an introduction of a pathogen into a naı¨ve population lished data). These were the last sightings of many of the (7, 8) or secondary to stress (6), but this paper presents affected species at these locations. Apparently healthy adults evidence of a specific pathogen as a potential cause of am- and tadpoles of Taudactylus acutirostris were collected from phibian declines. Previous investigations of sudden declines Big Tableland in late September 1993 for captive breeding; where adult mortality was suspected retrospectively (9, 10), or however, none survived. Dead or morbid wild and captive observed (6, 11, 12), have not included rigorous diagnostic anurans from additional locations in Australia and Central examinations of large numbers of animals. America also were collected. (Table 1). The captive anurans Montane riparian amphibian populations have declined included rain forest frogs, Mixophyes fasciolatus, and intro- markedly in Queensland (Australia) and in Central America duced toads, Bufo marinus, which had been bred in captivity in with no evidence of environmental causes (13, 14). In these Australia and held in large, open collections that experienced locations, documented declines have appeared to progress high mortality (.90% of the M. fasciolatus) at 2–3 weeks temporally and geographically consistent with an epidemic, postmetamorphosis. Retrospective histological examinations and, in monitored areas, mass mortalities of adult anurans of the skin of formalin-fixed, ethanol-stored museum speci- have been detected (refs. 7, 8, 14, and 15; K.R.L., unpublished mens were performed on riparian anurans (n 5 28; 7 genera, data). Tadpoles were seen at these sites after adults had 13 species) that had been collected during amphibian surveys disappeared (ref. 7; K.R.L., unpublished data). Diagnostic in 1987–1995 in three protected sites in the montane regions investigations to detect infectious and noninfectious diseases of south-central Costa Rica (Las Tablas and Las Cruces, were performed on the dead amphibians, and our results Puntarenas Province) and western Panama (Fortuna Forest provide strong evidence that cutaneous chytridiomycosis was Reserve), 1–10 years before population declines at those sites. the cause of these mortalities. Toeclips collected into formalin during survey work on healthy Members of the phylum Chytridiomycota are heterotrophic Litoria spenceri from southeastern Australia (Kosciuszko Na- fungi that are ubiquitous and cosmopolitan (16, 17). They are found primarily in soil and water where they usually act as This paper was submitted directly (Track II) to the Proceedings office. Abbreviation: ssu-rDNA, small-subunit rRNA genes. The publication costs of this article were defrayed in part by page charge Data deposition: The sequence reported in this paper has been deposited in the GenBank database (accession no. AF051932). payment. This article must therefore be hereby marked ‘‘advertisement’’ in cTo whom reprint requests should be addressed at: Commonwealth accordance with 18 U.S.C. §1734 solely to indicate this fact. Scientific and Industrial Research Organization, Australian Animal © 1998 by The National Academy of Sciences 0027-8424y98y959031-6$2.00y0 Health Laboratory, P.O. Bag 24, Geelong, VIC 3220, Australia. PNAS is available online at http:yywww.pnas.org. e-mail: [email protected]. 9031 Downloaded by guest on September 28, 2021 9032 Population Biology: Berger et al. Proc. Natl. Acad. Sci. USA 95 (1998) Table 1. Amphibian deaths and morbidity associated with chytridiomycosis No. with chytridiomycosisy Species Location Date of death no. examined Taudactylus acutirostris Big Tableland, Australia, November 1993–January 1994 2y2 15°429S, 145°169E, and Captive Townsville, October 1993 5y7* Australia Litoria rheocola Big Tableland, Australia, October–November 1993 1y2* 15°429S, 145°169E Litoria nannotis Big Tableland, Australia, October–November 1993 2y4* 15°429S, 145°169E Taudactylus eungellensis Eungella National Park, October 1995 1y1 21°049S, 148°389E Litoria lesueuri Mary River, Australia, May–June 1996 5y5 26°379S, 152°419E Limnodynastes dumerilii Goomburra, Australia, December 1996 1y1 27°589S, 152°209E Litoria caerulea Brisbane, Australia, July–September 1996 7y8 27°389S, 152°239E, Casino, Australia, July 1996 3y4 28°509S, 153°029E; and Brisbane, Australia, June–July 1997 5y5 27°379S, 152°389E Limno dynastes Adelaide, Australia, May–June 1996 4y4 tasmaniensis 34°469S, 138°329E Mixophyes fleayi Cunningham’s Gap, August–October 1996 4y5 Australia, 28°039S, 152°229E Bufo marinus Captive Geelong, June–August 1996 18y18 Australia Mixophyes fasciolatus Captive Melbourne, December 1996–February 1997 35y35 Australia Litoria spenceri Central Highlands, February 1998 4y4 Australia, 37°229S, 146°029E Atelopus chiriquiensis Captive, Cerro Pando, February 1994 4y5 Panama Atelopus varius Fortuna, Panama, January 1997 3y3 8°439N, 82°149W Bufo haematiticus Fortuna, Panama, January 1997 2y2 8°439N, 82°149W Cochranella prosoblepon Fortuna, Panama, January 1997 2y2 8°439N, 82°149W Cochranella Fortuna, Panama, January 1997 2y2 albomaculata 8°439N, 82°149W Eleutherodactylus Fortuna, Panama, January 1997 8y8 emcelae 8°439N, 82°149W Eleutherodactylus Fortuna, Panama, January 1997 2y2 cruentus 8°439N, 82°149W *Histological examination of the skin was limited to the dorsum. tional Park) also were examined histologically for chytrids. crobact 24 NE (Medvet Science, Adelaide, Australia), and API Toeclips from 42 frogs had been collected during the 2 years 20E (BioMerieux, Charbonnier les Bains, France) systems. For before any observations of unusual mortality. virological testing, frozen samples of liver, lung, kidney, mus- Pathology and Microbiology. Frogs were fixed whole in cle, gonad, and brain were macerated, passed through a neutral
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