Palabras clave
Ceratozamia norstogii complex
Zamiaceae
Mexico
genetic variation
speciation
founder effects
complejo de Ceratozamia norstogii
Zamiaceae
México
variación genética
especiación
efecto fundador
cícadas
Cómo citar
Resumen
Los cuatro taxa que componen el complejo Ceratozamia norstogii de especies en el sur de México están estrechamente relacionados y se dan en hábitats similares (bosque de Quercus). Todos tienen folíolos linear-lanceolados con gran similitud entre ellos, sobre todo en las etapas juveniles, pero se diferencian con la edad. Ha habido un debate en relación con la delimitación de especies debido a la pérdida de caracteres en especímenes de herbario. Los objetivos de este estudio son determinar la variación genética y medir la similitud genética entre los cuatro taxones en el complejo. Las poblaciones estudiadas están en; Cintalapa, Chiapas para C. alvarezii y C. norstogii, la Sierra Atravesada, Oaxaca para C. chimalapensis y Villa Flores, Chiapas para C. mirandae. Se tomaron muestras de una población de cada taxón (sólo una población es conocida para C. alvarezii) 11-15 individuos adultos elegidos al azar fueron muestreados. Veintiocho primers fueron probados, de los cuales cinco fueron polimórficos mediante la técnica RAPD's. Los datos fueron analizados utilizando métodos bayesianos. Los resultados revelaron baja diversidad genética y la diferenciación encontrada entre las especies sugiere una divergencia reciente. Un estudio morfológico y anatómico anterior en el complejo encontró que los taxa son distintos. Sin embargo, los resultados del presente estudio han demostrado que el complejo C. norstogii aun se encuentra en un proceso de divergencia, probablemente a través de deriva genética y efectos de fundador.Citas
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