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Cryptic extinction risk in a western Pacific lizard radiation
McDonald, Peter J. Brown, Rafe M. Kraus, Fred Bowles, Philip Arifin, Umilaela Eliades, Samuel J. Fisher, Robert N. Gaulke, Maren Grismer, L. Lee Ineich, Ivan
McDonald, Peter J.
Brown, Rafe M.
Kraus, Fred
Bowles, Philip
Arifin, Umilaela
Eliades, Samuel J.
Fisher, Robert N.
Gaulke, Maren
Grismer, L. Lee
Ineich, Ivan
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Abstract
Cryptic ecologies, the Wallacean Shortfall of undocumented species’ geographical ranges and the Linnaean Shortfall of undescribed diversity, are all major barriers to conservation assessment. When these factors overlap with drivers of extinction risk, such as insular distributions, the number of threatened species in a region or clade may be underestimated, a situation we term ‘cryptic extinction risk’. The genus Lepidodactylus is a diverse radiation of insular and arboreal geckos that occurs across the western Pacific. Previous work on Lepidodactylus showed evidence of evolutionary displacement around continental fringes, suggesting an inherent vulnerability to extinction from factors such as competition and predation. We sought to (1) comprehensively review status and threats, (2) estimate the number of undescribed species, and (3) estimate extinction risk in data deficient and candidate species, in Lepidodactylus. From our updated IUCN Red List assessment, 60% of the 58 recognized species are threatened (n = 15) or Data Deficient (n = 21), which is higher than reported for most other lizard groups. Species from the smaller and isolated Pacific islands are of greatest conservation concern, with most either threatened or Data Deficient, and all particularly vulnerable to invasive species. We estimated 32 undescribed candidate species and linear modelling predicted that an additional 18 species, among these and the data deficient species, are threatened with extinction. Focusing efforts to resolve the taxonomy and conservation status of key taxa, especially on small islands in the Pacific, is a high priority for conserving this remarkably diverse, yet poorly understood, lizard fauna. Our data highlight how cryptic ecologies and cryptic diversity combine and lead to significant underestimation of extinction risk.
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Date
2022-05-25
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Springer
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Keywords
Geckos, IUCN red list, Lepidodactylus, Linnean shortfall, New Guinea, Philippines, Wallacea
Citation
McDonald PJ, Brown RM, Kraus F, Bowles P, Arifin U, Eliades SJ, Fisher RN, Gaulke M, Grismer LL, Ineich I, Karin BR, Meneses CG, Richards SJ, Sanguila MB, Siler CD, Oliver PM. Cryptic extinction risk in a western Pacific lizard radiation. Biodivers Conserv. 2022 May 25:1-18. doi: 10.1007/s10531-022-02412-x. Epub ahead of print. PMID: 35633848; PMCID: PMC9130968.