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State of the World's Amphibians
Open accessAbstract
The Anthropocene is characterized by a widespread biodiversity crisis that is rivaling prehistoric mass extinctions. Amphibians are the most threatened class of vertebrates. In addition to traditional threats such as land-use conversion and pollution, climate change and introduced diseases are expected to further reduce amphibian biodiversity. The fungal disease chytridiomycosis has caused the rapid extirpation of tens to possibly hundreds of amphibian species. Recent advances have revealed a deep evolutionary history and considerable variation in the virulence of strains of the fungal pathogen, patterns that need to be reconciled with the rapid spread of disease and demise of host populations. A conservation priority is surveillance of a newly discovered species of chytrid fungus that is killing European salamanders. The accelerated discovery of new amphibian species challenges existing conservation resources, but it is an opportunity to fill geographical gaps and to enhance programs aimed at preserving amphibian biodiversity.
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“Most research has focused on the fungus Batrachochytrium dendrobatidis, which has precipitated mass-mortality events and catastrophic reductions in over 200 frog species world-wide (63, 73, 74).”
From Climate-driven declines in arthropod abundance restructure a rainforest food web (2018) · cites this paper as [74]
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Climate-driven declines in arthropod abundance restructure a rainforest food web
Lister, B. C., & Garcia, A. (2018) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1722477115 · Cited by 730
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“Additionally, a comprehensive understanding of dispersal in this group is key in supporting evidence-based conservation, a pressing global issue since amphibians are the most threatened class of vertebrates (Catenazzi 2015).”
BackgroundPhylogenetic homogenization of amphibian assemblages in human-altered habitats across the globe
Nowakowski, A. J., Frishkoff, L. O., Thompson, M. E., Smith, T. M., & Todd, B. D. (2018) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1714891115 · Cited by 140
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BackgroundPeptides for Skin Protection and Healing in Amphibians
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“In this regard, WH and anti-oxidant abilities can be important to limit and heal skin ulcers like those due to fungal diseases, such as chytridiomycosis, which has caused the greatest disease-driven loss of biodiversity reported by science, with documented mass die-offs, community collapse, and the extinction of possi…”
BackgroundSelf-citationAdams, A. J., Kupferberg, S. J., Wilber, M. Q., Pessier, A. P., Grefsrud, M., Bobzien, S., Vredenburg, V. T., & Briggs, C. J. (2017) · Ecosphere · doi:10.1002/ecs2.1740 · Cited by 92
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“…of amphibian species discovery has continued for 73 decades due to increased survey effort, and the incorporation of molecular and bioacoustics 74 data in delineating species and increased collaboration (Köhler et al. 2005; Vieites et al. 75 2009; Catenazzi 2015), and shows no signs of slowing.”
Sauer, E. L., Fuller, R. C., Richards‐Zawacki, C. L., Sonn, J. M., Sperry, J. H., & Rohr, J. R. (2018) · Proceedings of the Royal Society B Biological Sciences · doi:10.1098/rspb.2018.1111 · Cited by 63
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“…has been implicated in the spread of Bd (Hanselmann et al. 2004; Garner et al. 2006; Fisher and Garner 2007; Schloegel et al. 2009), yet little preventive action has been taken to mitigate its spread, which has resulted in a global pandemic (Stuart et al. 2004; Voyles et al. 2014; Catenazzi 2015).”
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“Anuran amphibians are recognized as the most endangered vertebrates in the world, making them a priority group for conservation assessment, facing extinction or population declines (Lannoo et al. 2011; Catenazzi 2015; Tapley et al. 2018).”
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“Responses centered around several common hypotheses of amphibian declines, including chytridiomycosis, pet trade, exotic species, and climate change (Catenazzi, 2015); however, two relatively unique threats emerged: increased recreational use of habitats and extreme flooding (Table 2).”
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“…are considered the most sensitive to climate change of any group of vertebrates (Foden et al., 2013; Lawler et al., 2009; Raxworthy et al., 2008) and one of the groups most threatened by habitat loss, with a high percentage of species at risk of extinction (Catenazzi, 2015; Stuart et al., 2008).”
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Self-citationCatenazzi, A., Flechas, S. V., Burkart, D., Hooven, N. D., Townsend, J., & Vredenburg, V. T. (2018) · Frontiers in Microbiology · doi:10.3389/fmicb.2018.00465 · Cited by 35
“Amphibians are considered one of the most threatened group of vertebrates on earth (Stuart et al., 2004; Wake and Vredenburg, 2008; Catenazzi, 2015), and the recently emerged disease chytridiomycosis, caused by the fungal pathogen Batrachochytrium dendrobatidis (Bd), has decimated species of amphibians in many parts o…”
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“The success of the conservation of amphibian species relies on precise detection and mapping [2,8], and it is, therefore, important to evaluate the currently applied methodology against newly developed methods and current needs.”
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“Amphibians are undergoing an unprecedented decline worldwide, making them the most endangered class of vertebrates on the planet; at least a third of the species are listed as threatened (IUCN Red List), resulting in a major loss of biodiversity.(6) The causes of this decline have been reported to include habitat loss…”
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“vertebrate taxa, with >40% of species threatened with extinction (Catenazzi 2015), and the synergy between human‐ induced and natural stressors (e.”
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“…declines 72 , anticipating changes to water bodies after precipitation 73,74 ; and making more granular predictions of effects of global change on organisms such as amphibians 75,76 , those dependent on specialized interaction partners 77,78 , and rare and biogeographically limited species 79 .”
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“While globally there is agreement on major factors contributing to declines (Catenazzi 2015; Garner et al. 2016), local variation in cofactors appears to mediate large-scale drivers, precluding broad-scale solutions and emphasizing the importance of information at the local scale (Grant et al.…”
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“The majority of the amphibian declines have occurred in the tropics of Australia, Central America, and South America [6,7], and have been observed even in seemingly pristine and protected environments [8,9].”
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“Amphibians are rapidly declining worldwide due to human-induced changes in the environment (Catenazzi, 2015; Alton & Franklin, 2017).”
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“It is known that the intensity and occurrence of epizootic outbreaks and length of negative effects upon amphibian communities have varied globally (Catenazzi, 2015).”
BackgroundPriority research needs to inform amphibian conservation in the Anthropocene
Grant, E. H. C., Amburgey, S. M., Gratwicke, B., Acosta-Chaves, V. J., Belasen, A. M., Bickford, D., Brühl, C. A., Calatayud, N. E., Clemann, N., Clulow, S., et al. (2023) · Conservation Science and Practice · doi:10.1111/csp2.12988 · Cited by 21
“, 2012) and thus progress has been uneven (Catenazzi, 2015).”
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“Amphibians are among the most threatened vertebrates on Earth (Catenazzi 2015), and their populations are rapidly declining worldwide, mainly due to the loss and degradation of their natural habitats (Stuart et al. 2004; Eigenbrod et al. 2008).”
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Borzée, A., Prasad, V. K., Neam, K., Tarrant, J., Kosch, T. A., Barata, I. M., Rais, M., Bickford, D., da Fonte, L. F. M., Wilcken, J., et al. (2025) · Nature Reviews Biodiversity · doi:10.1038/s44358-025-00101-5 · Cited by 23
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“These stressors induce a series of direct or indirect changes upon amphibians’ phenology, behaviour, physiology, metabolism, and depending on their severity, may cause population declines and local or regional extinction (e.g., Sodhi et al., 2008; Hoffmann & Sgrò, 2011; Blaustein et al., 2012; Pimm et al., 2014; Caten…”
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“Amphibians likewise have complex life cycles and are sensitive to environmental change (Catenazzi, 2015).”
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“Amphibians are the most endangered vertebrate group on the planet, with 41% of their species listed as threatened (Catenazzi 2015; IUCN 2021).”
BackgroundThe post hoc measurement as a safe and reliable method to age and size plethodontid salamanders
Lunghi, E., Giachello, S., Manenti, R., Zhao, Y., Corti, C., Ficetola, G. F., & Bradley, J. G. (2020) · Ecology and Evolution · doi:10.1002/ece3.6748 · Cited by 16
“Amphibians are among the most affected species as they often show the combined effects of high sensitivity to environmental alteration and low dispersal ability (Beebee & Griffiths, 2005; Catenazzi, 2015).”
BackgroundRojas, S. J. S., Whitworth, A. W., Paredes-Garcia, J. A., Huarcaya, R. P., Whittaker, L., Loayza, K. H. H., & MacLeod, R. (2022) · Tropical Conservation Science · doi:10.1177/19400829221134811 · Cited by 15
“We used amphibians as a model system because of their sensitivity to environmental change and because they are considered the most threatened vertebrate class on the planet (Catenazzi, 2015).”
MethodBiodiversity responses to land-use change in the equatorial Andes
Ríos‐Touma, B., Rosero, P., Morabowen, A., Guayasamin, J. M., Carson, C., Villamarín‐Cortez, S., Solano-Ugalde, A., Tobes, I., & Cuesta, F. (2023) · Ecological Indicators · doi:10.1016/j.ecolind.2023.111100 · Cited by 15
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Effects of selective timber harvest on amphibian species diversity in Budongo forest Reserve, Uganda
Lukwago, W., Behangana, M., Mwavu, E. N., & Hughes, D. F. (2019) · Forest Ecology and Management · doi:10.1016/j.foreco.2019.117809 · Cited by 14
Barriga-Vallejo, C., Aguilera, C., Cruz, J., Banda-Leal, J., Lazcano, D., & Mendoza, R. (2017) · Water Air & Soil Pollution · doi:10.1007/s11270-017-3590-3 · Cited by 14
Alvarado‐Rybak, M., Lepe-López, M., Peñafiel‐Ricaurte, A., Valenzuela‐Sánchez, A., Valdivia, C., Mardones, F. O., Bacigalupe, L. D., Puschendorf, R., Cunningham, A. A., & Azat, C. (2021) · Scientific Reports · doi:10.1038/s41598-021-96535-w · Cited by 17
Abdullah, S., Cruz, K. C. D., Casim, L. F., Agduma, A. R., & Tanalgo, K. C. (2023) · Conservation · doi:10.3390/conservation3030025 · Cited by 13
Sreedharan, G., & Vasudevan, K. (2021) · Journal of the Indian Institute of Science · doi:10.1007/s41745-021-00227-3 · Cited by 12
Martino, G., Chiocchio, A., Siclari, A., & Canestrelli, D. (2022) · Nature Conservation · doi:10.3897/natureconservation.50.86002 · Cited by 12
Hong, Y.-H., Yuan, Y., Li, K., Storey, K. B., Zhang, J., Zhang, S., & Yu, D. (2024) · International Journal of Molecular Sciences · doi:10.3390/ijms25115967 · Cited by 13
Microreserves are an important tool for amphibian conservation
Steigerwald, E., Chen, J., Oshiro, J., Vredenburg, V. T., Catenazzi, A., & Koo, M. S. (2024) · Communications Biology · doi:10.1038/s42003-024-06510-0 · Cited by 14
Self-citationMonroy‐Vilchis, O., Heredia-Bobadilla, R. L., Zarco-González, M. M., Ávila-Akerberg, V., & Sunny, A. (2019) · Herpetozoa · doi:10.3897/herpetozoa.32.e38023 · Cited by 11
Vasconcelos‐Teixeira, R., Titon, S. C. M., Titon, B., Pompêo, M. L. M., Gomes, F. R., & Assis, V. R. (2021) · Biological Trace Element Research · doi:10.1007/s12011-021-02699-x · Cited by 12
Rudin-Bitterli, T. S., Mitchell, N. J., & Evans, J. P. (2018) · The American Naturalist · doi:10.1086/699231 · Cited by 12
“Moreover, amphibians have experienced substantial species losses and population declines over recent decades (Alroy 2015; Catenazzi 2015).”
BackgroundMarr, M. M., Hopkins, K., Tapley, B., Borzée, A., Liang, Z., Cunningham, A. A., Yan, F., Wang, J., & Turvey, S. T. (2024) · Evolutionary Journal of the Linnean Society · doi:10.1093/evolinnean/kzae007 · Cited by 11
Reproductive ecology of a Tibetan frogNanorana parkeri(Anura: Ranidae)
Lü, X., Ma, X., Fan, L., Hu, Y., Lang, Z., Li, Z., Fang, B., & Guo, W. (2016) · Journal of Natural History · doi:10.1080/00222933.2016.1205155 · Cited by 11
“In addition, we hope to aid the conservation of a species which, according to our observations (unpublished), has exhibited population decline in some localities, as has been the case of many anurans, especially those residing in relatively pristine habitats (Catenazzi 2015).”
BackgroundTesticular morphometric changes in neotropical anurans from agroecosystems
Rezende, W. R., Santos, L. R. D. S., Franco‐Belussi, L., & de Oliveira, C. (2020) · Environmental Pollution · doi:10.1016/j.envpol.2020.116265 · Cited by 11
Díaz‐Paniagua, C., Florencio, M., de Felipe, M., Ramírez-Soto, M., Roman, I. K., & Arribas, R. (2024) · Amphibia-Reptilia · doi:10.1163/15685381-bja10179 · Cited by 10
Taugbøl, A., Bærum, K. M., Dervo, B. K., & Fossøy, F. (2021) · Environmental DNA · doi:10.1002/edn3.180 · Cited by 10
Barrile, G. M., Chalfoun, A. D., Estes‐Zumpf, W. A., & Walters, A. W. (2022) · Ecosphere · doi:10.1002/ecs2.4212 · Cited by 9
“…animals can display time-lagged responses to wildfire (Hossack, Lowe, & Corn, 2013; Smucker et al., 2005), we created an additional variable to explore potential differences in survival among pre-fire years (2015 – 2018), 1 year after wildfire (2018 – 2019), and 2 years post-fire (2019 – 2020).”
What makes a successful species? Traits facilitating survival in altered tropical forests
Hirschfeld, M., & Rödel, M. (2017) · BMC Ecology · doi:10.1186/s12898-017-0135-y · Cited by 11
Lucca, G. D. S. D., de Barros, F. A. P., de Oliveira, J. V., Magro, J. D., & Lucas, E. (2017) · Wetlands Ecology and Management · doi:10.1007/s11273-017-9573-8 · Cited by 10
“Among vertebrates, amphibians have been the most affected, with probably one-third of all species in the world suffering some extinction degree (Catenazzi 2015).”
Barrasso, D. A., & Basso, N. G. (2018) · Journal of Zoological Systematics & Evolutionary Research · doi:10.1111/jzs.12259 · Cited by 10
Can road stormwater ponds be successfully exploited by the European green frog (Pelophylax sp.)?
Conan, A., Jumeau, J., Dehaut, N., Enstipp, M. R., Georges, J., & Handrich, Y. (2021) · Urban Ecosystems · doi:10.1007/s11252-021-01129-z · Cited by 10
Liao, Z., Zhang, W., Guo, Z., Qian, Q., He, Y., Xiao, Q., Wu, N., Shi, X., Liu, Z., Liang, L., et al. (2025) · Journal of Biogeography · doi:10.1111/jbi.15085 · Cited by 9
“Over 41% of extant amphibian species worldwide are severely threatened with extinction (Hoffmann et al. 2010; Catenazzi 2015; Mi et al. 2022).”
Amphibian communities along a forest degradation gradient in an East African forest reserve
Isingoma, J., Sande, E., Kityo, R., & Hughes, D. F. (2023) · Ecological Informatics · doi:10.1016/j.ecoinf.2023.102021 · Cited by 8
Saboyá‐Acosta, L. P., & Urbina-Cardona, N. (2023) · Tropical Conservation Science · doi:10.1177/19400829231169984 · Cited by 10
“They have a long-term negative effect on amphibian populations and increase the probability of direct mortality of species (Nowakowski et al., 2017; Catenazzi, 2015).”
BackgroundZhang, W., Liao, Z., Xiao, Q., Zhou, J., Shi, X., Li, C., Chen, Y. F., & Xu, W. (2023) · The Science of The Total Environment · doi:10.1016/j.scitotenv.2023.165959 · Cited by 10
Vidal, M. A., Henríquez, N., Torres‐Díaz, C., Collado, G. A., & Acuña‐Rodríguez, I. S. (2024) · Biology · doi:10.3390/biology13030169 · Cited by 9
“Their vulnerability to environmental changes makes them valuable sentinels of environmental quality [28], helping maintain natural system balance [29,30].”
BackgroundA new species of Pristimantis from southern Ecuador (Anura, Craugastoridae)
Cogălniceanu, D., Székely, P., Székely, D., Páez, N., & Ron, S. R. (2016) · ZooKeys · doi:10.3897/zookeys.606.9121 · Cited by 9
“Our knowledge of Neotropical amphibians is mediocre at best (Duellman 1999), with nearly one-quarter of all known species described over the last decade and 150 to 200 new species described yearly (Catenazzi 2015).”
Backgroundda Silva, F. R., Provete, D. B., & Hawkins, B. A. (2016) · Natureza & Conservação · doi:10.1016/j.ncon.2016.07.001 · Cited by 8
Catenazzi, A., & Ttito, A. (2019) · PeerJ · doi:10.7717/peerj.6780 · Cited by 9
“, 2017) suggest that many additional species remain to be discovered and recognized throughout the tropical Andes (Catenazzi, 2015).”
BackgroundSelf-citationVandvik, V., Måren, I. E., Ndangalasi, H. J., Taplin, J. R. D., Mbago, F. M., & Lovett, J. C. (2014) · Ecosphere · doi:10.1890/es14-00093.1 · Cited by 9
Tanalgo, K. C., Cruz, K. C. D., Agduma, A. R., Lidasan, A. K., Edradan, J. C., Dumayas, R. K. L., Alagdon, J. S., Villaruz, B. D., & Gatoc, G. K. P. (2025) · The Science of The Total Environment · doi:10.1016/j.scitotenv.2025.180274 · Cited by 11
Catenazzi, A., Ttito, A., Diaz, M. I., & Shepack, A. (2017) · ZooKeys · doi:10.3897/zookeys.685.12152 · Cited by 8
“Knowledge of the diversity of this genus has improved dramatically over the past decade (Chaparro et al. 2015), contributing to Peru's high rate of new species discoveries (Catenazzi 2015).”
BackgroundSelf-citationdos Anjos, A. G., Costa, R. N., Brito, D., & Solé, M. (2020) · Ethology Ecology & Evolution · doi:10.1080/03949370.2020.1711815 · Cited by 8
“The main causes are reflection of anthropogenic actions, such as habitats loss and fragmentation, overexploitation, environmental pollution and contamination, invasion of exotic species and climatic changes, factors that can also collaborate with diseases dispersion such as chytridiomycosis (e.g. Stuart et al. 2004; A…”
BackgroundNiche Contraction of an Endangered Frog Driven by the Amphibian Chytrid Fungus
Granados-Martínez, S., Zumbado‐Ulate, H., Searle, C. L., Oliveira, B. F., & García‐Rodríguez, A. (2021) · EcoHealth · doi:10.1007/s10393-021-01525-z · Cited by 8
“Outbreaks of chytridiomycosis have caused mass mortalities of amphibians globally (Collins 2010; Catenazzi 2015) and represent one of the greatest documented loss of biodiversity attributable to a pathogen (Scheele et al. 2019a).”
BackgroundAmphibians of the equatorial seasonally dry forests of Ecuador and Peru
Armijos-Ojeda, D., Székely, D., Székely, P., Cogălniceanu, D., Cisneros-Heredia, D. F., Ordóñez‐Delgado, L., Escudero, A., & Espinosa, C. I. (2021) · ZooKeys · doi:10.3897/zookeys.1063.69580 · Cited by 9
“Understanding species distribution is especially urgent in the case of amphibians, the most threatened vertebrate group worldwide (Catenazzi 2015).”
BackgroundTytar, V., Nekrasova, O., Pupiņš, M., Škute, A., Kirjušina, M., Grāvele, E., Mežaraupe, L., Marushchak, O., Čeirāns, A., Kozynenko, I., et al. (2023) · Journal of Fungi · doi:10.3390/jof9060607 · Cited by 7
Sánchez‐Montes, G., Martínez-Solano, Í., Díaz‐Paniagua, C., Martínez‐Gil, H., Arntzen, J. W., & Gómez-Mestre, I. (2024) · Freshwater Biology · doi:10.1111/fwb.14255 · Cited by 7
Amphibians from a tropical dry forest: Arenillas Ecological Reserve, Ecuador
Székely, P., Székel, D., Armijos-Ojeda, D., Jara‐Guerrero, A., & Cogălniceanu, D. (2016) · Ecosistemas · doi:10.7818/ecos.2016.25-2.04 · Cited by 7
Trophic ecology of the Endangered Darwin’s frog inferred by stable isotopes
Molina-Burgos, B. E., Valenzuela‐Sánchez, A., Alvarado‐Rybak, M., Klarian, S. A., & Azat, C. (2018) · Endangered Species Research · doi:10.3354/esr00906 · Cited by 7
“A thorough understanding of the natural history of amphibian species, especially their trophic interactions, is critical to determine the impact that the documented loss of amphibians will have at the ecosystem level worldwide (Altig et al. 2007, Catenazzi 2015).”
BackgroundAltitude and temperature drive anuran community assembly in a Neotropical mountain region
Matavelli, R., de Oliveira, J. M., Soininen, J., Ribeiro, M. C., & Bertoluci, J. (2022) · Biotropica · doi:10.1111/btp.13074 · Cited by 9
“This has been occurring mainly because of the intensification of disruptive anthropogenic activities (Barnosky et al., 2011; Dirzo et al., 2014) as well as accelerated climate change (Bellard et al., 2012; Catenazzi, 2015; Chen et al., 2011).”
BackgroundZumbado‐Ulate, H., Neam, K., García‐Rodríguez, A., Ochoa‐Ochoa, L. M., Cháves, G., Kolby, J. E., Granados-Martínez, S., Hertz, A., Bolaños, F., Ariano‐Sánchez, D., et al. (2022) · Global Ecology and Conservation · doi:10.1016/j.gecco.2022.e02197 · Cited by 7
“Thus, one of the main challenges scientists have is to identify the various threats to amphibians across landscapes and spatial scales, so that appropriate conservation actions can be implemented in regions where they will have the largest impact (Catenazzi, 2015).”
Background
Metadata
- Authors
- Catenazzi, A.
- Affiliations
- Southern Illinois University Carbondale (US)
- Corresponding author
- Catenazzi, Alessandro
- Venue
- Annual Review of Environment and Resources
- Publisher
- Annual Reviews
- Published
- 2015-11-04
- Volume
- 40
- Issue
- 1
- Pages
- 91-119
- ISSN
- 1543-5938 (ISSN-L)
- 1545-2050
- OpenAlex
- W2137345966
- Cited by
- 211
- References
- 149
- Citations by year
- 2026: 15 · 2025: 20 · 2024: 23 · 2023: 21 · 2022: 15 · 2021: 26 · 2020: 20 · 2019: 25 · 2018: 19 · 2017: 18 · 2016: 7
- FWCI
- 1.25
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Annual Review of Environment and Resources (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Amphibian and Reptile Biology
- Physical Sciences › Environmental Science › Management, Monitoring, Policy and Law › Conservation, Ecology, Wildlife Education
- Physical Sciences › Environmental Science › Ecology › Freshwater macroinvertebrate diversity and ecology
- Keywords
- amphibians, amphibian diversity, chytridiomycosis, Batrachochytrium dendrobatidis, amphibian conservation, species extinction, climate change impacts, introduced diseases, land use conversion, pollution, fungal virulence, salamanders, new species discovery, biodiversity crisis
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