Divergencia genética en musarañas (Mammalia: Soricidae) de los bosques húmedos de montaña al norte del Neotrópico
DOI:
https://doi.org/10.22201/ib.20078706e.2021.92.3781Palabras clave:
Bosque de niebla, ADN mitocondrial, Eulipotyphla, Filogeografía, MéxicoResumen
Las musarañas del grupo Cryptotis mexicanus (Mammalia, Soricidae) están estrechamente asociadas con el bosque húmedo de montaña al norte del Neotrópico. Dentro de este grupo, los estudios filogenéticos han definido un grupo monofilético compuesto por 3 especies: C. nelsoni como hermana del clado C. obscurus - C. mexicanus. El patrón conocido de variación morfológica y las estimaciones de distribución potencial sugieren que su evolución está asociada con los cambios altitudinales inducidos por los últimos ciclos glaciales-interglaciales. En este estudio analizamos 70
secuencias mitocondriales del gen citocromo b para este clado mediante análisis filogeográficos y filogenéticos, esto para evaluar si los valles, cañones y planicies, a lo largo de la distribución de este grupo podrían estar promoviendo su estructura y diferenciación genética. Los resultados indican 4 grupos genéticos, parcialmente congruentes con estudios previos; uno de ellos corresponde a C. nelsoni, mientras que los otros 3 aparecen dentro del clado C. obscurus - C. mexicanus. La divergencia genética entre los 4 grupos sugiere la influencia de algunas barreras geográficas, desde valles y cañones hasta volcanes, que a través de los últimos ciclos glaciales-interglaciales podrían haber conformado el patrón actual de variación genética. Nuestros hallazgos sugieren que la taxonomía entre C. obscurus y C. mexicanus aún no está resuelta.
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