|
The white-tailed deer (''Odocoileus virginianus''), also known as the whitetail, is a medium-sized deer native to the United States, Canada, Mexico, Central America, and South America as far south as Peru and Bolivia.〔http://maps.iucnredlist.org/map.html?id=42394〕 It has also been introduced to New Zealand, Cuba, Jamaica, Hispaniola, Puerto Rico, Bahamas, Lesser Antilles, and some countries in Europe, such as Finland, the Czech Republic, and Serbia.〔http://jamaicachm.org.jm/PDF/August2007.pdf〕〔http://www.arthurgrosset.com/mammals/white-taileddeer.html〕〔http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1093&context=icwdm_wdmconfproc〕 In the Americas, it is the most widely distributed wild ungulate. In North America, the species is widely distributed east of the Rocky Mountains, but elsewhere, it is mostly replaced by the black-tailed or mule deer (''Odocoileus hemionus''). In western North America, it is found in aspen parklands and deciduous river bottomlands within the central and northern Great Plains, and in mixed deciduous riparian corridors, river valley bottomlands, and lower foothills of the northern Rocky Mountain regions from South Dakota and Wyoming to southeastern British Columbia, including the Montana Valley and Foothill grasslands. The conversion of land adjacent to the northern Rockies into agriculture use and partial clear-cutting of coniferous trees (resulting in widespread deciduous vegetation) has been favorable to the white-tailed deer and has pushed its distribution to as far north as Prince George, British Columbia. Populations of deer around the Great Lakes have also expanded their range northwards, due to conversion of land to agricultural uses favoring more deciduous vegetation, and local caribou and moose populations. The westernmost population of the species, known as the Columbian white-tailed deer, once was widespread in the mixed forests along the Willamette and Cowlitz River valleys of western Oregon and southwestern Washington, but today its numbers have been considerably reduced, and it is classified as near-threatened. ==Taxonomy== Some taxonomists have attempted to separate white-tailed deer into a host of subspecies, based largely in morphological differences. Genetic studies, however, suggest fewer subspecies within the animal's range, as compared to the 30 to 40 subspecies that some scientists described in the last century. The Florida Key deer, ''O. virginianus clavium'', and the Columbian white-tailed deer, ''O. virginianus leucurus'', are both listed as endangered under the U.S. Endangered Species Act. In the United States, the Virginia white-tail, ''O. virginianus virginianus'', is among the most widespread subspecies. The white-tailed deer species has tremendous genetic variation and is adaptable to several environments. Several local deer populations, especially in the southern states, are descended from white-tailed deer transplanted from various localities east of the Continental Divide. Some of these deer populations may have been from as far north as the Great Lakes region to as far west as Texas, yet are also quite at home in the Appalachian and Piedmont regions of the south. These deer over time have intermixed with the local indigenous deer (''O. virginianus virginianus'' and/or ''O. virginianus macrourus'') populations. Central and South America have a complex number of white-tailed deer subspecies that range from Guatemala as far south as Peru. This list of subspecies of deer is more exhaustive than the list of North American subspecies, and the number of subspecies is also questionable. However, the white-tailed deer populations in these areas are difficult to study, due to overhunting in many parts and a lack of protection. Some areas no longer carry deer, so it is difficult to assess the genetic difference of these animals. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「White-tailed deer」の詳細全文を読む スポンサード リンク
|