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dc.contributor.advisorKolterman, Duane A.
dc.contributor.authorSepúlveda-Orengo, Marian T.
dc.date.accessioned2018-09-19T19:22:10Z
dc.date.available2018-09-19T19:22:10Z
dc.date.issued2000
dc.identifier.urihttps://hdl.handle.net/20.500.11801/923
dc.description.abstractAdiantum vivesii Proctor is a rare fern endemic to the northwestern part of Puerto Rico, known only from its type locality on limestone substrate on privately owned land in the Municipality of Quebradillas. The distribution, abundance, morphology, and cytology of the species were studied to clarify its status as a distinct species or of hybrid or polyploid origen. The population of A. vivesii occupies a total area of 21 m x 10 m; eight sympatric species of Adiantum are found in the immediate area. Following several deep excavations it was concluded that the entire population of A. vivesii is one individual with proliferation by rhizomes. Morphological measurements and light and scanning microscopy were used to describe some parts of A. vivesii and A. tetraphyllum. Morphometric studies were conducted for 22 characters of the species and the possible parent, Adiantum tetraphyllum. Greater variability was obtained within the A. tetraphyllum population, and statistically significant differences between the two species were observed for 17 characteristics. Meiotic studies were inconclusive, but no evident difference in chromosome number was observed between the two species. The spores of A. tetraphyllum showed normal appearance and were rarely abortive, while those of A. vivesii showed greater variability in size and were almost always abortive, suggesting that A. vivesii is a sterile hybrid.en_US
dc.description.abstractAdiantum vivesii Proctor es un helecho raro y endémico de la parte noroeste de Puerto Rico, sólo conocido de su localidad tipo en suelos cársicos en terrenos privados del Municipio de Quebradillas. La distribución, abundancia, morfología y citología de la especie fueron estudiados para aclarar el estado de la especie como distinta, un híbrido o de origen poliploide. La población de A. vivesii ocupa un área total de 21 m x 10 m; se encuentran ocho especies simpátricas de Adiantum en el área inmediata. Después de algunas escavaciones profundas se concluyó que la población de A. vivesii consta de un solo individuo con proliferaciones del rizoma. Medidas morfológicas y microscopía de luz y rastreo fueron utilizadas para describir algunas partes de A. vivesii y A. tetraphyllum. Estudios morfométricos fueron conducidos para 22 caracteres de la especie y del posible progenitor Adiantum tetraphyllum. Se obtuvo mayor variabilidad dentro de la población de A. tetraphyllum; 17 características fueron encontradas con diferencias estadísticamente significativas entre las especies. Estudios meióticos fueron inconclusos, pero no se observó una diferencia evidente en el número cromosómico entre las dos especies. Las esporas de A. tetraphyllum mostraron una apariencia normal y raramente estuvieron abortivos, mientras que las de Adiantum vivesii mostraron mayor variabilidad en el tamaño y casi siempre estuvieron abortivas, lo cual sugiere que A. vivesii es un híbrido estéril.en_US
dc.language.isoenen_US
dc.subjectAdiantum vivesii Proctoren_US
dc.subjectFernen_US
dc.subjectAdiantum tetraphyllumen_US
dc.subject.lcshPolypodiaceaeen_US
dc.subject.lcshMaidenhair fernsen_US
dc.subject.lcshFerns--Puerto Rico--Quebradillas--Classificationen_US
dc.subject.lcshRare ferns--Puerto Rico--Quebradillas--Classificationen_US
dc.titleBiosystematic analysis of Adiantum vivesii Proctor (Polypodaceae: Adianthoideae), a rare fern endemic to northwestern Puerto Ricoen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2000 Marian Tamari Sepúlveda-Orengoen_US
dc.contributor.committeeSastre-De Jesús, Inés
dc.contributor.committeeBreckon, Gary J.
dc.contributor.representativeGonzález Miranda, Sally
thesis.degree.levelM.S.en_US
thesis.degree.disciplineBiologyen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Biologyen_US
dc.description.graduationYear2000en_US


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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a graduate degree at UPR-Mayagüez.

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