MORPHOLOGICAL VARIATION IN THE SINALOAN MOUSE Peromyscus simulus
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ABSTRACT. We examined geographic and non-geographic variation in 23 quantitative characters of the cranium and body for samples of Peromyscus simulus from throughout the range of the species in Sinaloa and Nayarit, Mexico. Univariate statistical analyses indicated little non-geographic variation associated with either sex or age. Geographic variation was evident among samples, with northern, inland representatives averaging smaller in size and showing some degree of distinction from southern, coastal samples. However, the degree of this differentiation is not sufficient to warrant the delineation of subspecies. Available evidence suggest P. simulus has a relative narrow preference for wetland and riparian habitats within its geographic range. These habitats are subject to increased development in this region of Mexico, and, for this reason, the conservation status of the species should be carefully monitored in the future.
RESUMEN. Examinamos la variación geográfica y no geográfica de 23 caracteres cuantitativos del cuerpo y cráneo de muestras de Peromyscus simulus a lo largo de la distribución de la especie en los estados de Nayarit y Sonora, México. Análisis estadísticos univariados mostraron poca variación no geográfica asociada con el sexo o la edad. Fue evidente la variación geográfica en muestras de representantes de islas al norte, siendo estas de menor tamaño en promedio y mostrando una ligera diferencia con respecto a las muestras costeras y más sureñas. Sin embargo, el grado de esta diferenciación no es suficiente para garantizar el límite de una subespecie. La evidencia disponible, sugiere que P. simulus tiene, relativamente, una preferencia por hábitats riparios y humedales dentro de su rango geográfico. El desarrollo de estos hábitats se ha incrementado en las últimas décadas; por esta razón, en el futuro el estado de conservación de la especie debe ser monitoreado cuidadosamente.
Key words: Peromyscus simulus, morphological variation, Sinaloan mouse, Sinaloa, Nayarit, México.
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Revista Mexicana de Mastozoología, nueva época por Instituto de Ecología, UNAM. Se distribuye bajo una Licencia Creative Commons Atribución-NoComercial-CompartirIgual 4.0 Internacional.
Basada en una obra en http://revistamexicanademastozoologia.com.mx/ojs/index.php/rmm.
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