Origin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records

Abstract Guava (Psidium guajava) is an aggressive invasive plant in the Galapagos Islands. Determining its provenance and genetic diversity could explain its adaptability and spread, and how this relates to past human activities. With this purpose, we analyzed 11 SSR markers in guava individuals fro...

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Autores principales:	Diego Urquía, Bernardo Gutierrez, Gabriela Pozo, Maria Jose Pozo, Maria de Lourdes Torres
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	colonization pathway Galapagos Islands genetic diversity guava invasive species Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/74ba1a04ef784129b6aa585ac0820118
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spelling	oai:doaj.org-article:74ba1a04ef784129b6aa585ac08201182021-11-08T17:10:41ZOrigin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records2045-775810.1002/ece3.8193https://doaj.org/article/74ba1a04ef784129b6aa585ac08201182021-11-01T00:00:00Zhttps://doi.org/10.1002/ece3.8193https://doaj.org/toc/2045-7758Abstract Guava (Psidium guajava) is an aggressive invasive plant in the Galapagos Islands. Determining its provenance and genetic diversity could explain its adaptability and spread, and how this relates to past human activities. With this purpose, we analyzed 11 SSR markers in guava individuals from Isabela, Santa Cruz, San Cristobal, and Floreana islands in the Galapagos, as well as from mainland Ecuador. The mainland guava population appeared genetically differentiated from the Galapagos populations, with higher genetic diversity levels found in the former. We consistently found that the Central Highlands region of mainland Ecuador is one of the most likely origins of the Galapagos populations. Moreover, the guavas from Isabela and Floreana show a potential genetic input from southern mainland Ecuador, while the population from San Cristobal would be linked to the coastal mainland regions. Interestingly, the proposed origins for the Galapagos guava coincide with the first human settlings of the archipelago. Through approximate Bayesian computation, we propose a model where San Cristobal was the first island to be colonized by guava from the mainland, and then, it would have spread to Floreana and finally to Santa Cruz; Isabela would have been seeded from Floreana. An independent trajectory could also have contributed to the invasion of Floreana and Isabela. The pathway shown in our model agrees with the human colonization history of the different islands in the Galapagos. Our model, in conjunction with the clustering patterns of the individuals (based on genetic distances), suggests that guava introduction history in the Galapagos archipelago was driven by either a single event or a series of introduction events in rapid succession. We thus show that genetic analyses supported by historical sources can be used to track the arrival and spread of invasive species in novel habitats and the potential role of human activities in such processes.Diego UrquíaBernardo GutierrezGabriela PozoMaria Jose PozoMaria de Lourdes TorresWileyarticlecolonization pathwayGalapagos Islandsgenetic diversityguavainvasive speciesEcologyQH540-549.5ENEcology and Evolution, Vol 11, Iss 21, Pp 15111-15131 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	colonization pathway Galapagos Islands genetic diversity guava invasive species Ecology QH540-549.5
spellingShingle	colonization pathway Galapagos Islands genetic diversity guava invasive species Ecology QH540-549.5 Diego Urquía Bernardo Gutierrez Gabriela Pozo Maria Jose Pozo Maria de Lourdes Torres Origin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records
description	Abstract Guava (Psidium guajava) is an aggressive invasive plant in the Galapagos Islands. Determining its provenance and genetic diversity could explain its adaptability and spread, and how this relates to past human activities. With this purpose, we analyzed 11 SSR markers in guava individuals from Isabela, Santa Cruz, San Cristobal, and Floreana islands in the Galapagos, as well as from mainland Ecuador. The mainland guava population appeared genetically differentiated from the Galapagos populations, with higher genetic diversity levels found in the former. We consistently found that the Central Highlands region of mainland Ecuador is one of the most likely origins of the Galapagos populations. Moreover, the guavas from Isabela and Floreana show a potential genetic input from southern mainland Ecuador, while the population from San Cristobal would be linked to the coastal mainland regions. Interestingly, the proposed origins for the Galapagos guava coincide with the first human settlings of the archipelago. Through approximate Bayesian computation, we propose a model where San Cristobal was the first island to be colonized by guava from the mainland, and then, it would have spread to Floreana and finally to Santa Cruz; Isabela would have been seeded from Floreana. An independent trajectory could also have contributed to the invasion of Floreana and Isabela. The pathway shown in our model agrees with the human colonization history of the different islands in the Galapagos. Our model, in conjunction with the clustering patterns of the individuals (based on genetic distances), suggests that guava introduction history in the Galapagos archipelago was driven by either a single event or a series of introduction events in rapid succession. We thus show that genetic analyses supported by historical sources can be used to track the arrival and spread of invasive species in novel habitats and the potential role of human activities in such processes.
format	article
author	Diego Urquía Bernardo Gutierrez Gabriela Pozo Maria Jose Pozo Maria de Lourdes Torres
author_facet	Diego Urquía Bernardo Gutierrez Gabriela Pozo Maria Jose Pozo Maria de Lourdes Torres
author_sort	Diego Urquía
title	Origin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records
title_short	Origin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records
title_full	Origin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records
title_fullStr	Origin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records
title_full_unstemmed	Origin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records
title_sort	origin and dispersion pathways of guava in the galapagos islands inferred through genetics and historical records
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/74ba1a04ef784129b6aa585ac0820118
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Origin and dispersion pathways of guava in the Galapagos Islands inferred through genetics and historical records

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