Palabras clave
ADN mitocondrial
genética de poblaciones
estructura poblacional
Tupinambis teguixin
Venezuela.
geographic barriers
mitochondrial DNA
population genetics
population structure
Tupinambis teguixin
Venezuela.
Cómo citar
Resumen
Tupinambis teguixin es la única especie registrada para Venezuela. Este teido se encuentra distribuido en diferentes bioregiones del Neotrópico, en algunos casos separadas por barreras geográficas que pueden estar restringiendo el flujo genético entre sus poblaciones. Para evaluar esta posibilidad, pusimos a prueba las Hipótesis Paleogeográfica y la Rivereña. Para ello evaluamos el grado de estructuración genética de seis poblaciones de T. teguixin de Venezuela, una de Brasil y una de Ecuador. Utilizamos dos bases de datos moleculares, una con las poblaciones de Venezuela (Base de datos Venezuela, 1 023 pb) y la segunda incluyendo las otras dos poblaciones (Base de datos Suramérica, 665 pb), con 93 y 102 secuencias concatenadas de citocromo b y ND4, y 38/37 haplotipos. En cuanto a la metodología, utilizamos tres medidas de diversidad genética: diversidad nucleotídica, diversidad haplotípica y número de sitios polimórficos. Estimamos el flujo genético mediante el estadístico ΦST y los valores de FST pareados. También construimos redes de haplotipos. Los resultados evidencian estructura poblacional, encontrándose (1) un ΦST global de 0.83, (2) FST pareados altos (0.54-0.94), (3) redes de haplotipos con un patrón geográfico definido, cada población con sus haplotipos agrupados (menos Delta), Zulia y Ecuador con redes separadas, y (4) un solo haplotipo compartido entre las poblaciones. Los análisis muestran que la estructura no es producto de la distancia geográfica entre las poblaciones (r = 0.282, p = 0.209), sino un efecto histórico biogeográfico de la Cordillera de Mérida y del río Orinoco (71.19 % variación molecular), como barreras geográficas. Consideramos la población del Zulia una unidad evolutiva significativa y proponemos que las otras poblaciones temporalmente sean consideradas unidades de manejo, hasta tanto se tenga más información. Las poblaciones del Delta y Guri conformarán una sola unidad de manejo por compartir un haplotipo.
Citas
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