Abstract
Amphibian populations are declining worldwide and this is causing growing concern. High levels of population declines followed by the expansion of red lists are creating demands for effective strategies to maximize conservation efforts for amphibians. Ideally, integrated and comprehensive strategies should be based on complementary information of population and species extinction risk. Here we evaluate the congruence between amphibian extinction risk assessments at the population level (Declining Amphibian Database––DAPTF) and at species level (GAA––IUCN Red List). We used the Declining Amphibian Database––DAPTF that covers 967 time-series records of amphibian population declines assigned into four levels of declines. We assigned each of its corresponding species into GAA––IUCN red list status, discriminated each species developmental mode, and obtained their geographic range size as well. Extinction risk assessments at the population and species level do not fully coincide across geographic realms or countries. In Paleartic, Neartic and Indo-Malayan realms less than 25% of species with reported population declines are formally classified as threatened. In contrast, more than 60% of all species with reported population declines that occur in Australasia and the Neotropics are indeed threatened according to the GAA––IUCN Red List. Species with aquatic development presented proportionally higher extinction risks at both population and species level than those with terrestrial development, being this pattern more prominent at Australasia, Paleartic, and Neartic realms. Central American countries, Venezuela, Mexico and Australia presented the highest congruence between both population and species risk. We address that amphibian conservation strategies could be improved by using complementary information on time-series population trends and species threat. Whenever feasible, conservation assessments should also include life-history traits in order to improve its effectiveness.
References
Alford RA, Richards SJ (1999) Global amphibian declines: a problem in applied ecology. Annu Rev Ecol Syst 30:133–165
Bell KE, Donnelly MA (2006) Influence of forest fragmentation on community structure of frogs and lizards in northeastern Costa Rica. Conserv Biol 20:1750–1760
Brandon K, Fonseca GAB, Rylands AB et al (2005) Special section: Brazilian conservation: challenges and opportunities. Conserv Biol 19:595–761
Brown JH, Lomolino MV (1998) Biogeography, 2nd edn. Sinauer Associates, Mass
Bustamante MR, Ron SR, Coloma LA (2005) Cambios en la diversidad en siete comunidades de anuros en los Andes de Ecuador. Biotropica 37:180–189
Ceballos G, Ehrlich PR (2002) Mammal population losses and the extinction crisis. Science 296:904–907
Ceballos G, Ehrlich PR, Soberon J et al (2005) Global mammal conservation: what must we manage? Science 309:603–607
Channell R, Lomolino MV (2000) Trajectories to extinction: spatial dynamics of the contraction of geographical ranges. J Biogeogr 27:169–179
Collins JP, Storfer A (2003) Global amphibian declines: sorting the hypotheses. Divers Distrib 9:89–98
DAPTF (2007) Declining amphibian database––DAD. Declining Amphibian Populations Task Force. http://www.open.ac.uk/daptf
Duellman WE, Trueb L (1986) Biology of amphibians. McGraw-Hill, New York
Eterovick PC, Carnaval ACOD, Borges-Nojosa DM et al (2005) Amphibian declines in Brazil: an overview. Biotropica 37:166–179
Gascon C, Lovejoy TE, Bierregaard RO, Malcolm JR, Stouffer PC, Vasconcelos HL, Laurance WF, Zimmerman B, Tocher M, Borges S (1999) Matrix habitat and species richness in tropical forest remnants. Biol Conserv 91:223–229
Haddad CFB, Prado CPA (2005) Reproductive modes in frogs and their unexpected diversity in the Atlantic Forest of Brazil. Bioscience 55:207–217
Hero JM, Morrison C (2004) Frog declines in Australia: global implications. Herpetol J 14:175–186
Hero JM, Williams SE, Magnusson WE (2005) Ecological traits of declining amphibians in upland areas of eastern Australia. J Zool (Lond) 267:221–232
IUCN (2001) IUCN Red List categories and criteria: version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, UK
IUCN, Conservation International, NatureServe (2006) Global amphibian assessment. http://www.globalamphibians.org
Lamoreux JF, Akçakaya HR, Bennun L, Collar NJ, Boitani L, Brackett D, Bräutigam A, Brooks TM, da Fonseca GAB, Mittermeier RA, Rylands AB, Gärdenfors U, Hilton-Taylor C, Mace G, Stein BA, Stuart S (2003) Value of the IUCN Red List. Trends Ecol Evol 18:214–215
Lamoreux JF, Morrison JC, Ricketts TH et al (2006) Global tests of biodiversity concordance and the importance of endemism. Nature 440:212–214
Lewinsohn TM, Prado PI (2005) How many species are there in Brazil? Conserv Biol 19:619–624
Lips KR, Green DE, Papendick R (2003a) Chytridiomycosis in wild frogs from southern Costa Rica. J Herpetol 37:215–218
Lips KR, Reeve JD, Witters LR (2003b) Ecological traits predicting amphibian population declines in Central America. Conserv Biol 17:1078–1088
Loyola RD, Kubota U, Lewinsohn TM (2007) Endemic vertebrates are the most effective surrogates for identifying conservation priorities among Brazilian ecoregions. Divers Distrib 13:389–396
Mittermeier RA, Mittermeier CG (1997) Megadiversity: earth’s biologically wealthiest nations. CEMEX, Mexico City
Mittermeier RA, Mittermeier CG, Brooks TM et al (2003) Wilderness and biodiversity conservation. Proc Natl Acad Sci USA 100:10309–10313
Mittermeier RA, Robles Gil P, Hoffman M et al (2004) Hotspots revisited: earth’s biologically richest and most endangered terrestrial ecoregions. CEMEX, Mexico City
Olson DM, Dinerstein E (2002) The Global 200: priority ecoregions for global conservation. Ann Miss Bot Garden 89:199–224
Pimenta BVS, Haddad CFB, Nascimento LB et al (2005) Comment on “Status and trends of amphibian declines and extinctions worldwide”. Science 309:1999
Pounds JA, Fogden MPL, Campbell JH (1999) Biological response to climate change on a tropical mountain. Nature 398:611–615
Pounds JA, Bustamante MR, Coloma LA et al (2006) Widespread amphibian extinctions from epidemic disease driven by global warming. Nature 439:161–167
Rodrigues ASL, Pilgrim JD, Lamoreux JF et al (2006) The value of the IUCN Red List for conservation. Trends Ecol Evol 21:71–76
Silva WG, Metzger JP, Simões SJ et al (2007) Relief influence on the spatial distribution of the Atlantic Forest cover at the Ibiúna Plateau. SP Braz J Biol 67:631–637
Silvano RAM, Udvardy S, Ceroni M et al (2005) An ecological integrity assessment of a Brazilian Atlantic Forest watershed based on surveys of stream health and local farmers’ perceptions: implications for management. Ecol Econ 53:369–385
Stattersfield AJ, Crosby MJ, Long AJ, Wege DC (1998) Endemic bird areas of the world. BirdLife International, Cambridge
Stuart SN, Chanson JS, Cox NA et al (2004) Status and trends of amphibian declines and extinctions worldwide. Science 306:1783–1786
Tocher MD, Gascon C, Meyer J (2001) Community composition and breeding success of Amazonian frogs in continuous forest and matrix habitat aquatic sites. In: Bierregaard RO, Gascon C, Lovejoy TE, Mesquita RCG (eds) Lessons from Amazonia: the ecology and conservation of a fragmented forest. Yale University Press, New Haven, pp 235–247
Urbina-Cardona JN, Olivares-Perez M, Reynoso VH (2006) Herpetofauna diversity and microenvironment correlates across a pasture-edge-interior ecotone in tropical rainforest fragments in the Los Tuxtlas Biosphere Reserve of Veracruz, Mexico. Biol Conserv 132:61–75
Viana VM, Tabanez AAJ, Batista JL (1997) Restoration and management of fragmented landscapes. In: Laurance WF, Bierregaard RO (eds) Tropical forest remnants: ecology, management and conservation of fragmented communities. University of Chicago Press, Chicago
Whiles MR, Lips KR, Pringle CM et al (2006) The effects of amphibian population declines on the structure and function of Neotropical stream ecosystems. Front Ecol Environ 4:27–34
Acknowledgements
The authors are grateful to T. Halliday, J. Kauffman (Declining Amphibian Populations Task Force—DAPFT), S. Stuart and J. Chanson (Global Amphibian Assessment) for providing an early version of their databases. We thank T. Halliday, J. Kauffman, S. Stuart, J. Chanson, C. R. Fonseca, J. A. F. Diniz-Filho, P. C. Eterovick, S. Pawar, and two anonymous referees for their helpful comments on the manuscript. This study was carried out in the UNICAMP Graduate Program of Ecology. Carlos Guilherme Becker and Rafael Dias Loyola were respectively supported by FAPESP (04/13132-3) and CNPq (140267/2005-0).
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Becker, C.G., Loyola, R.D. Extinction risk assessments at the population and species level: implications for amphibian conservation. Biodivers Conserv 17, 2297–2304 (2008). https://doi.org/10.1007/s10531-007-9298-8
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DOI: https://doi.org/10.1007/s10531-007-9298-8