Cryptic diversity of limestone karst inhabiting land snails (Cyclophorus spp.) in northern Vietnam, their evolutionary history and the description of four new species
Autoři:
Katharina C. M. von Oheimb aff001; Parm Viktor von Oheimb aff001; Takahiro Hirano aff003; Tu Van Do aff004; Jonathan Ablett aff001; Hao Van Luong aff006; Sang Van Pham aff007; Fred Naggs aff001
Působiště autorů:
Life Sciences Department, The Natural History Museum, London, England, United Kingdom
aff001; Museum für Naturkunde – Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
aff002; Department of Biological Sciences, University of Idaho, Moscow, Idaho, United States of America
aff003; Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
aff004; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
aff005; Centre for Rescue and Conservation of Organisms, Hoang Lien National Park, Sa Pa, Vietnam
aff006; Department of Specimen Preparation and Exhibitive Design, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
aff007
Vyšlo v časopise:
PLoS ONE 14(10)
Kategorie:
Research Article
doi:
https://doi.org/10.1371/journal.pone.0222163
Souhrn
Limestone karsts can form terrestrial habitat islands for calcium-dependent organisms. In Vietnam, many karst habitats are threatened, while their rich biodiversity is still far from being thoroughly explored. Given that conservation of karst biota strongly relies on correct species identification, the presence of undetected cryptic species can pose severe problems. The present study focuses on cryptic diversity among karst-inhabiting land snails of the genus Cyclophorus in northern Vietnam, where specimens with a similar shell morphology have been reported from various regions. In order to examine the diversity and evolutionary history of this “widespread morphotype”, we generated a Bayesian phylogeny based on DNA sequence data. Automatic Barcode Gap Discovery (ABGD) and the Bayesian implementation of the Poisson tree processes model (bPTP) contributed to species delimitation and analyses of shell shape and size aided the morphological characterisation of individual species. We found that the examined specimens of the widespread morphotype did not form a single monophyletic group in the phylogeny but clustered into several different clades. We delimited nine different species that develop the widespread morphotype and described four of them as new. Processes of convergent evolution were probably involved in the origin of the delimited species, while their generally allopatric distribution could result from interspecific competition. Our findings indicate ongoing processes of speciation and a potential case of morphological character displacement. The high degree of morphological overlap found among the species underlines the importance of DNA sequence data for species delimitation and description in the genus Cyclophorus. Given the findings of the present study and the high potential that as yet undiscovered cryptic taxa have also evolved in other groups of karst-inhabiting organisms, we argue for a systematic and efficient detection and description of Vietnam’s karst biodiversity to provide a solid basis for future conservation planning.
Klíčová slova:
Cryptic speciation – Ethanol – Limestone – New species reports – Phylogenetic analysis – Species delimitation – Vietnam – Karst features
Zdroje
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