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dc.contributor.advisorMartínez-Cruzado, Juan C.
dc.contributor.authorPorrata-Doria Rivera, Tirtsa
dc.date.accessioned2018-05-16T17:03:44Z
dc.date.available2018-05-16T17:03:44Z
dc.date.issued2006
dc.identifier.urihttps://hdl.handle.net/20.500.11801/627
dc.description.abstractThe geographic range of the Shiny Cowbird (Molothrus bonariensis minimus) was limited to northeastern South America until the twentieth century. However, this range has expanded to the Caribbean and more recently to the United States. It has jeopardized the population of over 200 avian species within its novel expanded range because of its parasitic behavior. The rapid successful expansion of the Shiny Cowbird, if based on a small number of migrants, may have resulted in a loss of genetic diversity. This study examined the Shiny Cowbird’s genetic diversity in both its original and expanded ranges by means of mitochondrial DNA. Sequences of 5 genes and the control region reflected a single haplotype in 34 samples in the expanded range, and 2 haplotypes in 3 birds in the original range. Genetic estimates indicated: pˆ of 0.00043, K of 0.00141, Ĥ of 0.66667, and FST of 0.85771. These estimates indicate lack of gene flow and differentiation between the original and expanded range specimens. These results agree with a founder event.en_US
dc.description.abstractLa región geográfica del tordo lustroso (Molothrus bonariensis minimus) estuvo limitado a América del Sur hasta el siglo veinte. Sin embargo, ésta región se ha expandido al Caribe y mas recientemente a los Estados Unidos. Ésta especie ha comprometido las poblaciones de más de 200 otras especies de aves. La rápida sucesión y exitosa expansión del Tordo lustroso, si es basada en un número pequeño de migrantes puede haber limitado la variabilidad genética en ambas áreas. Éste estudio investigó la diversidad genética del tordo lustroso entre especímenes del área original y el área expandida con el ADN mitocondrial. Secuencias de 5 genes y la región control reflejaron un haplotipo en 34 muestras en el área expandida y dos haplotipos en 3 muestras en el área original. Estimados genéticos muestran: pˆ de 0.00043, K de 0.00141, Ĥ de 0.66667 y FST de 0.85771. Estos estimados indican flujo genético limitado y diferenciación entre los especímenes del área original y expandida. Estos resultados concuerdan con un efecto fundador.en_US
dc.description.sponsorshipYellow Shouldered Blackbird Recovery Project of the Department of Natural and Environmental Resources. Annette Díaz, from the Puerto Rico Health Department. Robb Brumfield and Donna Dittman of the Louisiana State University Museum of Natural Sciences, Department of Genetic Resources for their assistance in the loan of seven Shiny Cowbirds specimens.. David Willard, Bird Collection manager of the Field Museum of Natural History, for his assistance in the loan of specimen 89288..en_US
dc.language.isoenen_US
dc.subjectShiny Cowbirden_US
dc.subjectMolothrus bonariensis minimusen_US
dc.subjectAvian speciesen_US
dc.subjectShiny Cowbird’s genetic diversityen_US
dc.subjectMitochondrial DNAen_US
dc.subject.lcshMolothrus--Geneticsen_US
dc.subject.lcshMolothrus--Home rangeen_US
dc.subject.lcshMolothrus--Variationen_US
dc.titleGenetic diversity of the shiny Cowbird (Molothrus bonariensis minimus): A mtDNA study on the variability within original and expanded rangeen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2006 Tirtsa Porrata-Doria Riveraen_US
dc.contributor.committeeLewis, Allen R.
dc.contributor.committeeLópez-Ortiz, Ricardo
dc.contributor.representativeSaliva, Jorge
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.graduationYear2006en_US


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  • Theses & Dissertations
    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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