Endemic, endangered, and evolutionarily significant: Cryptic lineages in Seychelles’ frogs

Labisko, Jim, Griffiths, Richard A., Chong-Seng, Lindsay, Bunbury, Nancy, Maddock, Simon T., Bradfield, Kay S., Taylor, Michele L., Groombridge, Jim J. (2019) Endemic, endangered, and evolutionarily significant: Cryptic lineages in Seychelles’ frogs. Biological Journal of the Linnean Society, . ISSN 0024-4066. (doi:10.1093/biolinnean/bly183)

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https://doi.org/10.1093/biolinnean/bly183

Abstract

Cryptic diversity that corresponds with island origin has been previously reported in the endemic, geographically restricted sooglossid frogs of the Seychelles archipelago. The evolutionary pattern has not been fully explored, and given current amphibian declines and the increased extinction risk faced by island species, we sought to identify evolutionarily significant units (ESUs) to address conservation concerns for these highly threatened anurans. We obtained genetic data for two mitochondrial (mtDNA) and four nuclear (nuDNA) genes from all known populations of sooglossid frog (the islands of Mahé, Praslin, and Silhouette) to perform phylogenetic analyses and construct nuDNA haplotype networks. Bayesian and maximum likelihood analyses of mtDNA support monophyly and molecular differentiation of populations in all species that occur on multiple islands. Haplotype networks using statistical parsimony revealed multiple high-frequency haplotypes shared between islands and taxa, in addition to numerous geographically distinct (island-specific) haplotypes for each species. We consider each island-specific population of sooglossid frog as an ESU and advise conservation managers to do likewise. Furthermore, our results identify each island lineage as a candidate species, evidence for which is supported by Bayesian Poisson Tree Processes analyses of mtDNA, and independent analyses of mtDNA and nuDNA using the multispecies coalescent. Our findings add to the growing understanding of the biogeography and hidden diversity within this globally important region.

Item Type: Article
DOI/Identification number: 10.1093/biolinnean/bly183
Uncontrolled keywords: candidate species, cryptic diversity, evolutionarily significant unit, Indian Ocean, insular amphibians, islands, Sechellophryne, Seychelles, Sooglossidae, Sooglossus
Subjects: Q Science > QH Natural history > QH426 Genetics
Q Science > QH Natural history > QH75 Conservation (Biology)
Divisions: Faculties > Social Sciences > School of Anthropology and Conservation
Faculties > Social Sciences > School of Anthropology and Conservation > Biodiversity Conservation Group
Faculties > Social Sciences > School of Anthropology and Conservation > Biodiversity Management Group
Faculties > Social Sciences > School of Anthropology and Conservation > DICE (Durrell Institute of Conservation and Ecology)
Depositing User: Jim Labisko
Date Deposited: 19 Jan 2019 06:40 UTC
Last Modified: 30 May 2019 08:45 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/71727 (The current URI for this page, for reference purposes)
Labisko, Jim: https://orcid.org/0000-0001-9324-5899
Griffiths, Richard A.: https://orcid.org/0000-0002-5533-1013
Groombridge, Jim J.: https://orcid.org/0000-0002-6941-8187
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