Human-mediated secondary contact of two tortoise lineages results in sex-biased introgression

Abstract Human-mediated secondary contact of recently diverged taxa offers valuable opportunities for studying the evolutionary mechanisms involved in the establishment and maintenance of genetic boundaries between taxa. We used mitochondrial and microsatellite markers to examine a recently introduc...

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Autores principales:	Eva Graciá, Roberto C. Rodríguez-Caro, Ana C. Andreu, Uwe Fritz, Andrés Giménez, Francisco Botella
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/74413007cbb24625acc97cc76d310550
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spelling	oai:doaj.org-article:74413007cbb24625acc97cc76d3105502021-12-02T12:31:49ZHuman-mediated secondary contact of two tortoise lineages results in sex-biased introgression10.1038/s41598-017-04208-42045-2322https://doaj.org/article/74413007cbb24625acc97cc76d3105502017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04208-4https://doaj.org/toc/2045-2322Abstract Human-mediated secondary contact of recently diverged taxa offers valuable opportunities for studying the evolutionary mechanisms involved in the establishment and maintenance of genetic boundaries between taxa. We used mitochondrial and microsatellite markers to examine a recently introduced population of the spur-thighed tortoise (Testudo graeca) of mixed origin in the Doñana National Park (SW Spain). The earliest records of tortoises in Doñana trace back to the 18th century, but several population reinforcements in the 20th century with animals from Morocco are well-documented. Consequently, different genetic lineages, which represent distinct subspecies, are thought to co-exist there. Our results confirmed the presence of distinct lineages by revealing that tortoises of the subspecies T. g. marokkensis were introduced into a local allochthonous T. g. graeca population. Unexpectedly, T. g. marokkensis haplotypes exclusively appeared in males, and admixture levels were statistically sex-biased toward males. The sex ratio of the population deviated from parity, with males being 2.36-fold more abundant than females. Our results indicated that population reinforcements had a strong effect on the genetic composition of this population and aggravated its sex ratio deviation. We predict that this sex-biased pattern of introgression is ephemeral and advocated to the near loss of T. g. marokkensis haplotypes.Eva GraciáRoberto C. Rodríguez-CaroAna C. AndreuUwe FritzAndrés GiménezFrancisco BotellaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Eva Graciá Roberto C. Rodríguez-Caro Ana C. Andreu Uwe Fritz Andrés Giménez Francisco Botella Human-mediated secondary contact of two tortoise lineages results in sex-biased introgression
description	Abstract Human-mediated secondary contact of recently diverged taxa offers valuable opportunities for studying the evolutionary mechanisms involved in the establishment and maintenance of genetic boundaries between taxa. We used mitochondrial and microsatellite markers to examine a recently introduced population of the spur-thighed tortoise (Testudo graeca) of mixed origin in the Doñana National Park (SW Spain). The earliest records of tortoises in Doñana trace back to the 18th century, but several population reinforcements in the 20th century with animals from Morocco are well-documented. Consequently, different genetic lineages, which represent distinct subspecies, are thought to co-exist there. Our results confirmed the presence of distinct lineages by revealing that tortoises of the subspecies T. g. marokkensis were introduced into a local allochthonous T. g. graeca population. Unexpectedly, T. g. marokkensis haplotypes exclusively appeared in males, and admixture levels were statistically sex-biased toward males. The sex ratio of the population deviated from parity, with males being 2.36-fold more abundant than females. Our results indicated that population reinforcements had a strong effect on the genetic composition of this population and aggravated its sex ratio deviation. We predict that this sex-biased pattern of introgression is ephemeral and advocated to the near loss of T. g. marokkensis haplotypes.
format	article
author	Eva Graciá Roberto C. Rodríguez-Caro Ana C. Andreu Uwe Fritz Andrés Giménez Francisco Botella
author_facet	Eva Graciá Roberto C. Rodríguez-Caro Ana C. Andreu Uwe Fritz Andrés Giménez Francisco Botella
author_sort	Eva Graciá
title	Human-mediated secondary contact of two tortoise lineages results in sex-biased introgression
title_short	Human-mediated secondary contact of two tortoise lineages results in sex-biased introgression
title_full	Human-mediated secondary contact of two tortoise lineages results in sex-biased introgression
title_fullStr	Human-mediated secondary contact of two tortoise lineages results in sex-biased introgression
title_full_unstemmed	Human-mediated secondary contact of two tortoise lineages results in sex-biased introgression
title_sort	human-mediated secondary contact of two tortoise lineages results in sex-biased introgression
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/74413007cbb24625acc97cc76d310550
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Human-mediated secondary contact of two tortoise lineages results in sex-biased introgression

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