The species's range

It is uncertain how Oryzomys peninsulae arrived at its current distribution in Baja California Sur. In 1922, Nelson suggested that it may have been introduced from another part of Mexico in a shipment of farm products, but this hypothesis is disproved by the clear differentiation from other western Mexican Oryzomys that the species exhibits.[11]
The species's range may be relictual in nature:[11] although Oryzomys currently does not extend further north along the eastern coast of the Gulf of California than coastal southern Sonora,[20] the past distribution of the genus may have extended further north along the shores of the Gulf of California, perhaps even into the southwestern United States, and from there south into the Baja California peninsula. When Oryzomys disappeared from the northern regions, O. peninsulae would have become isolated on the peninsula. This possibility is supported by the relatively close resemblance between O. peninsulae and O. couesi mexicanus, from coastal western Mexico.[21]
Alternatively, the ancestor of Oryzomys peninsulae may have arrived during the late Miocene, about six million years ago, when the southern tip of the Baja California peninsula was an island located near what is now Nayarit and Jalisco in western Mexico. Some plants and birds from the area may have a similar biogeographic heritage.




Scottsdale Real Estate
tweedehands gigant dvd