Genetic structure and connectivity of Thalassia testudinum in oceanic and continental environments of the Colombian Caribbean

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dc.contributor.advisorVargas Ramírez, Mario Alfonso (Thesis advisor)
dc.contributor.advisorBarrios Gardelis, Lina María
dc.contributor.authorBarrios Amaya, Miguel David
dc.contributor.financerNational Geographic Society
dc.contributor.financerUnited Nations Educational, Scientific and Cultural Organization - UNESCO
dc.contributor.financerRufford Foundation
dc.contributor.researchgroupBiodiversidad y Conservación Genéticaspa
dc.date.accessioned2025-07-03T16:36:47Z
dc.date.available2025-07-03T16:36:47Z
dc.date.issued2024-08-24
dc.description.abstractThalassia testudinum, a critical ecosystem engineer in the Caribbean, provides essential habitat and supports vital ecosystem services. However, likewise other seagrass species globally, its populations face increasing anthropogenic pressures, leading to significant declines in coverage and functionality. Understanding the historical and contemporary population dynamics of this species, which exhibits both sexual and clonal reproduction, is crucial for effective conservation and management strategies. This study investigated the genetic diversity and connectivity of T. testudinum populations across oceanic and continental environments in the Colombian Caribbean, integrating data across the species' range and considering potential anthropogenic impacts. Microsatellite analysis of 240 samples from eight Colombian populations, compared with a previously developed regional dataset encompassing 32 additional populations, revealed a complex interplay of geological, oceanographic, biological, and anthropogenic factors shaping population structure. While relatively high genetic diversity and gene flow were observed at national and regional scales, distinct patterns emerged between oceanic and continental environments. These findings highlight (i) the identifiable population structure of the species comprising five genetic clusters in Colombia (ii) the remarkable (re)colonisation capacity of T. testudinum facilitated by long-distance dispersal, clonality, and inbreeding avoidance; (iii) the role of stochastic processes in dispersal and the lack of strong isolation-by-distance at certain scales; and (iv) the vulnerability of populations to short-term anthropogenic disturbances. This study identifies five Independent Management Units and underscores the need for area-specific conservation strategies to safeguard the long-term resilience of T. testudinum and the invaluable ecosystems it supports.eng
dc.description.abstractThalassia testudinum, una especie clave para la ingeniería del ecosistema de pastos marinos en el Caribe, proporciona un hábitat esencial y sustenta servicios ecosistémicos vitales. Sin embargo, al igual que otras especies de pastos marinos a nivel mundial, sus poblaciones se enfrentan a crecientes presiones antropogénicas, lo que ha conducido a disminuciones significativas en su cobertura y funcionalidad. Comprender la dinámica poblacional histórica y contemporánea de esta especie, que exhibe tanto reproducción sexual como clonal, es crucial su efectiva conservación. Este estudio investigó la diversidad genética y la conectividad de las poblaciones de T. testudinum en entornos oceánicos y continentales del Caribe colombiano, integrando datos a lo largo del rango de distribución de la especie y considerando los posibles impactos antropogénicos. El análisis de microsatélites de 240 muestras de ocho poblaciones colombianas, en comparación con un conjunto de datos regional previamente desarrollado que abarca 32 poblaciones adicionales, reveló una compleja interacción de factores geológicos, oceanográficos, biológicos y antropogénicos que dan forma a la estructura poblacional. Si bien se observó una diversidad genética y un flujo génico relativamente altos a escala nacional y regional, surgieron patrones diferenciados entre los entornos oceánicos y continentales. Estos hallazgos resaltan (i) la identificable estructura poblacional de la especie, que comprende cinco clusters genéticos en Colombia; (ii) la remarcable capacidad de (re)colonización de T. testudinum, facilitada por la dispersión de larga distancia, clonalidad y la prevención de la endogamia; (iii) el papel de la estocasticidad en la dispersión y la falta de significancia del aislamiento por distancia en ciertas escalas; y (iv) la vulnerabilidad de las poblaciones a las perturbaciones antropogénicas de corto plazo. Este estudio subraya la necesidad de estrategias de conservación específicas para cada área, a fin de salvaguardar la resiliencia a largo plazo de esta especie y el invaluable ecosistema que soporta (Texto tomado de la fuente).spa
dc.description.curricularareaOtra. Sede Caribespa
dc.description.degreelevelMaestríaspa
dc.description.degreenameMagíster en Ciencias - Biologíaspa
dc.description.methodsConservación genética; microsatélitesspa
dc.description.researchareaConservación genéticaspa
dc.description.sponsorshipThis endeavour would not have been possible without the generous funding and engagement of the National Geographic Society and its Early Career Grants Programme, Grant EC-396R-18; the UNESCO MAB Programme and its Young Scientists Awards, Contract Number 4500409564; and the Rufford Foundation and its Small Grants Programme, Grant 25077-1.spa
dc.format.extentVIII, 63 paginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/88284
dc.language.isoengspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Caribespa
dc.publisher.departmentCentro de estudios en Ciencias del mar-CECIMARspa
dc.publisher.facultyFacultad Caribespa
dc.publisher.placeSan Andrés Islasspa
dc.publisher.programCaribe - Caribe - Maestría en Ciencias - Biologíaspa
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial-CompartirIgual 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/spa
dc.subject.ddc570 - Biología::576 - Genética y evoluciónspa
dc.subject.ddc570 - Biología::577 - Ecologíaspa
dc.subject.ddc580 - Plantas::581 - Temas específicos en historia natural de las plantasspa
dc.subject.proposalConservation geneticseng
dc.subject.proposalseagrasseseng
dc.subject.proposalanthropogenic impacteng
dc.subject.proposalconnectivityeng
dc.subject.proposaloceanic islandseng
dc.subject.proposalcontinental environmentseng
dc.subject.proposalCaribbeaneng
dc.subject.proposalConservación genéticaspa
dc.subject.proposalpastos marinosspa
dc.subject.proposalimpactos antrópicosspa
dc.subject.proposalconectividadspa
dc.subject.proposalislas oceánicasspa
dc.subject.proposalambientes continentalesspa
dc.subject.proposalCaribespa
dc.titleGenetic structure and connectivity of Thalassia testudinum in oceanic and continental environments of the Colombian Caribbeaneng
dc.title.translatedEstructura genética y conectividad de Thalassia testudinum en ambientes oceánicos y continentales del Caribe colombianospa
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.redcolhttp://purl.org/redcol/resource_type/TMspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentEstudiantesspa
dcterms.audience.professionaldevelopmentGrupos comunitariosspa
dcterms.audience.professionaldevelopmentInvestigadoresspa
dcterms.audience.professionaldevelopmentMaestrosspa
dcterms.audience.professionaldevelopmentPúblico generalspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa
oaire.awardtitleGenetic structure and connectivity of Thalassia testudinum in oceanic and continental environments of the Colombian Caribbeanspa
oaire.fundernameNational Geographic Societyspa
oaire.fundernameUNESCOspa
oaire.fundernameRufford Foundationspa

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