The Andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure

Abstract The Andaman day gecko (Phelsuma andamanensis) is endemic to the Andaman Archipelago, located ~ 6000 km away from Madagascar where the genus Phelsuma likely evolved. We complemented existing phylogenetic data with additional markers to show that this species consistently branches off early i...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Ashwini V. Mohan, Pablo Orozco-terWengel, Kartik Shanker, Miguel Vences
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f50b6c7160c14a8a81c6d2c59693b170
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:f50b6c7160c14a8a81c6d2c59693b170
record_format	dspace
spelling	oai:doaj.org-article:f50b6c7160c14a8a81c6d2c59693b1702021-12-02T15:32:59ZThe Andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure10.1038/s41598-020-68402-72045-2322https://doaj.org/article/f50b6c7160c14a8a81c6d2c59693b1702020-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-68402-7https://doaj.org/toc/2045-2322Abstract The Andaman day gecko (Phelsuma andamanensis) is endemic to the Andaman Archipelago, located ~ 6000 km away from Madagascar where the genus Phelsuma likely evolved. We complemented existing phylogenetic data with additional markers to show that this species consistently branches off early in the evolution of the genus Phelsuma, and this early origin led us to hypothesize that island populations within the Andaman Archipelago could have further diversified. We sampled the Andaman day gecko from all major islands in the Andamans, developed new microsatellite markers and amplified mitochondrial markers to study population diversification. We detected high allelic diversity in microsatellites, but surprisingly poor geographical structuring. This study demonstrates that the Andaman day gecko has a panmictic population (K = 1), but with weak signals for two clusters that we name ‘North’ (North Andaman, Middle Andaman, Interview, Baratang, Neil, and Long Islands) and ‘South’ (Havelock, South Andaman, Little Andaman Islands). The mitochondrial COI gene uncovered wide haplotype sharing across islands with the presence of several private haplotypes (except for the Little Andaman Island, which only had an exclusive private haplotype) signalling ongoing admixture. This species differs from two other Andaman endemic geckos for which we provide comparative mitochondrial data, where haplotypes show a distinct phylogeographic structure. Testing population history scenarios for the Andaman day gecko using Approximate Bayesian Computation (ABC) supports two possible scenarios but fails to tease apart whether admixture or divergence produced the two weak clusters. Both scenarios agree that admixture and/or divergence prior to the onset of the last glacial maximum shaped the genetic diversity and structure detected in this study. ABC supports population expansion, possibly explained by anthropogenic food subsidies via plantations of cash crops, potentially coupled with human mediated dispersal resulting in the observed panmictic population. The Andaman day gecko may thus be a rare example of an island endemic reptile benefiting from habitat modification and increased movement in its native range.Ashwini V. MohanPablo Orozco-terWengelKartik ShankerMiguel VencesNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-17 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ashwini V. Mohan Pablo Orozco-terWengel Kartik Shanker Miguel Vences The Andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure
description	Abstract The Andaman day gecko (Phelsuma andamanensis) is endemic to the Andaman Archipelago, located ~ 6000 km away from Madagascar where the genus Phelsuma likely evolved. We complemented existing phylogenetic data with additional markers to show that this species consistently branches off early in the evolution of the genus Phelsuma, and this early origin led us to hypothesize that island populations within the Andaman Archipelago could have further diversified. We sampled the Andaman day gecko from all major islands in the Andamans, developed new microsatellite markers and amplified mitochondrial markers to study population diversification. We detected high allelic diversity in microsatellites, but surprisingly poor geographical structuring. This study demonstrates that the Andaman day gecko has a panmictic population (K = 1), but with weak signals for two clusters that we name ‘North’ (North Andaman, Middle Andaman, Interview, Baratang, Neil, and Long Islands) and ‘South’ (Havelock, South Andaman, Little Andaman Islands). The mitochondrial COI gene uncovered wide haplotype sharing across islands with the presence of several private haplotypes (except for the Little Andaman Island, which only had an exclusive private haplotype) signalling ongoing admixture. This species differs from two other Andaman endemic geckos for which we provide comparative mitochondrial data, where haplotypes show a distinct phylogeographic structure. Testing population history scenarios for the Andaman day gecko using Approximate Bayesian Computation (ABC) supports two possible scenarios but fails to tease apart whether admixture or divergence produced the two weak clusters. Both scenarios agree that admixture and/or divergence prior to the onset of the last glacial maximum shaped the genetic diversity and structure detected in this study. ABC supports population expansion, possibly explained by anthropogenic food subsidies via plantations of cash crops, potentially coupled with human mediated dispersal resulting in the observed panmictic population. The Andaman day gecko may thus be a rare example of an island endemic reptile benefiting from habitat modification and increased movement in its native range.
format	article
author	Ashwini V. Mohan Pablo Orozco-terWengel Kartik Shanker Miguel Vences
author_facet	Ashwini V. Mohan Pablo Orozco-terWengel Kartik Shanker Miguel Vences
author_sort	Ashwini V. Mohan
title	The Andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure
title_short	The Andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure
title_full	The Andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure
title_fullStr	The Andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure
title_full_unstemmed	The Andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure
title_sort	andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/f50b6c7160c14a8a81c6d2c59693b170
work_keys_str_mv	AT ashwinivmohan theandamandaygeckoparadoxanancientendemicwithoutpronouncedphylogeographicstructure AT pabloorozcoterwengel theandamandaygeckoparadoxanancientendemicwithoutpronouncedphylogeographicstructure AT kartikshanker theandamandaygeckoparadoxanancientendemicwithoutpronouncedphylogeographicstructure AT miguelvences theandamandaygeckoparadoxanancientendemicwithoutpronouncedphylogeographicstructure AT ashwinivmohan andamandaygeckoparadoxanancientendemicwithoutpronouncedphylogeographicstructure AT pabloorozcoterwengel andamandaygeckoparadoxanancientendemicwithoutpronouncedphylogeographicstructure AT kartikshanker andamandaygeckoparadoxanancientendemicwithoutpronouncedphylogeographicstructure AT miguelvences andamandaygeckoparadoxanancientendemicwithoutpronouncedphylogeographicstructure
_version_	1718387179094278144

The Andaman day gecko paradox: an ancient endemic without pronounced phylogeographic structure

Ejemplares similares