Systematics of the genus Dictyota J.V.Lamouroux, 1809 (Phaeophyceae– Ochrophyta) from the Archipelago of San Archipelago of San Andres, Old Providence, and Saint Cataline

dc.contributor.advisorGavio, Brigitte
dc.contributor.advisorDueñas Montalvo, Luisa Fernanda
dc.contributor.authorCorrales Castilla, Manuela Beatriz
dc.contributor.orcidCorrales Castilla, Manuela Beatriz [0009000207907898]
dc.contributor.researchgroupSistematica Molecular y Biogeografia de Algas Marinas
dc.coverage.countryColombia
dc.coverage.regionSan Andrés Isla
dc.date.accessioned2026-02-10T16:17:19Z
dc.date.available2026-02-10T16:17:19Z
dc.date.issued2025
dc.descriptionIlustraciones a color; Diagramas; Fotografías; Mapasspa
dc.description.abstractEsta tesis aborda la diversidad críptica, la taxonomía y la biogeografía del género de algas pardas Dictyota (Dictyotales, Phaeophyceae) en el mar Caribe, con énfasis en el archipiélago de San Andrés, Providencia y Santa Catalina. Dada la importancia ecológica y la amplia distribución de este grupo, se requieren más estudios de su diversidad, ya que la identificación de muchas especies continúa siendo problemática. Algunas especies presentan una marcada variación morfológica, mientras que otras muestran convergencia de caracteres, lo que limita definir rasgos diagnósticos confiables. Además, los avances moleculares han puesto en evidencia la presencia de especies crípticas dentro del género, destacando la necesidad de la taxonomía integrativa. La combinación de los marcadores moleculares psbA y cox1, empleados en estudios sistemáticos del género Dictyota en el Caribe, junto con descripciones morfológicas detalladas, permitió identificar tres nuevos registros para Colombia (D. mayae, D. pedrochei y D. canariensis), uno para el Caribe (D. cymatophila), así como describir tres nuevas especies para la ciencia (D. crassiuscula, D. bedoyae y D. pervagata), hasta ahora mantenidas en estado críptico o pseudocríptico. Además, se reestableció el estatus taxonómico de D. pfaffii, un linaje que permaneció largo tiempo confundido con D. friabilis. Las revisiones taxonómicas de especies ampliamente reportadas, como D. caribaea, D. pinnatifida y D. guineënsis, evidenciaron una variabilidad fenotípica no descrita en estudios previos. Asimismo, los análisis filogenéticos revelaron la existencia de dos clados distintos, ambos con el nombre de D. mertensii, uno de los cuales contiene un espécimen de Brasil, considerado como la verdadera D. mertensii, y otro que fue descrito como D. bedoyae sp. nov. Adicionalmente, el estudio de material de herbario permitió ampliar el conocimiento morfológico de especies tropicales de amplia distribución, como D. bartayresiana, D. hamifera y D. humifusa. En general, esta tesis aporta al conocimiento de la sistemática de Dictyota, amplía la línea base de la biodiversidad en el Caribe y establece un marco de referencia para futuros estudios taxonómicos, ecológicos y de conservación de las algas pardas tropicales. (Texto tomado de la fuente)spa
dc.description.abstractThis thesis investigates the cryptic diversity, taxonomy, and biogeography of the brown algal genus Dictyota (Dictyotales, Phaeophyceae) in the Caribbean Sea, with emphasis on the Colombian Insular Caribbean. Given the ecological importance and broad distribution of Dictyota, further studies are needed, as the identification of many species remains problematic. Some species exhibit notable morphological variation, while others show convergence of traits, leaving few reliable diagnostic characters. Moreover, molecular advances have revealed the prevalence of cryptic species, underscoring the need for integrative approaches. Combining molecular markers (psbA, cox1), previously used in studies in the Caribbean Sea, with detailed morphological analyses, this study contributes to extending morphological concepts and reveals overlooked diversity. Three taxa were documented as new country records (D. mayae, D. pedrochei, D. canariensis), one as a new regional record (D. cymatophila), and three species were newly described to science (D. crassiuscula, D. bedoyae, D. pervagata). In addition, the prostrate Caribbean species Dictyota pfaffii was reestablished, a lineage long identified as D. friabilis. Taxonomic revisions of widely reported species such as D. pinnatifida and D. guineënsis, as well as lesser-known taxa like D. caribaea with few diagnostic features, provided refined morphological diagnoses and highlighted the extent of phenotypic variability. Phylogenetic analyses disentangled two distinct clades under the name D. mertensii, confirming the Brazilian lineage as the true species and identifying a cryptic Caribbean lineage as D. bedoyae sp. nov. Additionally, the study of herbarium material enhanced the understanding of D. bartayresiana, D. hamifera, and D. humifusa. Overall, this thesis advances the systematics of Dictyota by expanding biodiversity baselines in the Caribbean and establishes a framework for future taxonomic, ecological, and conservation studies of tropical brown algae.eng
dc.description.degreelevelDoctorado
dc.description.degreenameDoctora en Ciencias – Biología
dc.description.researchareaBiología Marina
dc.format.extent260 páginas
dc.format.mimetypeapplication/pdf
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/89451
dc.language.isoeng
dc.publisherUniversidad Nacional de Colombia
dc.publisher.branchUniversidad Nacional de Colombia - Sede Caribe
dc.publisher.facultyFacultad Caribe
dc.publisher.placeSan Andrés Isla, Colombia
dc.publisher.programCaribe - Caribe - Doctorado en Ciencias - Biología
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccess
dc.rights.licenseAtribución-NoComercial 4.0 Internacional
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subject.ddc570 - Biología::579 - Historia natural microorganismos, hongos, algas
dc.subject.ddc630 - Agricultura y tecnologías relacionadas::631 - Técnicas específicas, aparatos, equipos, materiales
dc.subject.lembFENOTIPOSspa
dc.subject.lembPhenotypeeng
dc.subject.lembENLACE (GENETICA)spa
dc.subject.lembLinkage (Genetics)eng
dc.subject.lembINTERACCION GENOTIPO-MEDIO AMBIENTEspa
dc.subject.lembGenotype-environment interactioneng
dc.subject.lembALGAS MARINASspa
dc.subject.lembMarine algaeeng
dc.subject.proposalSeaflowereng
dc.subject.proposalCryptic diversityeng
dc.subject.proposalCaribbean Seaeng
dc.subject.proposalDictyota crassiuscula sp nov.eng
dc.subject.proposalDictyota bedoyae sp. nov.eng
dc.subject.proposalDictyota pervagata sp. nov.eng
dc.subject.proposalBrown macroalgaeeng
dc.subject.proposalDiversidad crípticaspa
dc.subject.proposalMar Caribespa
dc.subject.proposalAlgas pardas.spa
dc.titleSystematics of the genus Dictyota J.V.Lamouroux, 1809 (Phaeophyceae– Ochrophyta) from the Archipelago of San Archipelago of San Andres, Old Providence, and Saint Catalineeng
dc.title.translatedSistemática del género Dictyota J.V.Lamouroux, 1809 (Phaeophyceae–Ochrophyta) del Archipiélago de San Andrés, Providencia y Santa Catalinaspa
dc.typeTrabajo de grado - Doctorado
dc.type.coarhttp://purl.org/coar/resource_type/c_db06
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.contentText
dc.type.driverinfo:eu-repo/semantics/doctoralThesis
dc.type.redcolhttp://purl.org/redcol/resource_type/TD
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dcterms.audience.professionaldevelopmentEstudiantes
dcterms.audience.professionaldevelopmentInvestigadores
dcterms.audience.professionaldevelopmentMaestros
dcterms.audience.professionaldevelopmentPúblico general
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2

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