| 翻訳と辞書 |
| Great bison belt ： ウィキペディア英語版 |
Great bison belt
The great bison belt is a tract of rich grassland that ran from Alaska to the Gulf of Mexico around 9000 BC. The great bison belt was supported by spring and early summer rainfall that allowed short grasses to grow. These grasses retain their moisture at the roots which allowed for grazing ungulates such as bison to find high-quality nutritious food in autumn.
These grasses are what allowed the bison population to thrive, as they were able to receive all of their nutrients from the short grasses, unlike other Ice Age animals which expanded in the postglacial period. This area was important to the Plains Paleo-Indians, who around 8500 BC turned to bison hunting instead of hunting a broader range of food.
==Early History==
About 50-75 million years ago, surging molten rock formed the mountain ranges of the west, including the Black Hills. About 10 million years ago, geological forces shaped the rest of the Great Bison Belt, the largest terrestrial biome in North America.〔Isenberg, 13.〕 When the Pleistocene epoch ended about 10,000 years ago, warmer and drier weather came to dominate the region, making the biome ideal for grasslands and vegetation.〔Danz, 10.〕 Before human intervention, the Great Bison Belt included most of the present-day United States as well as parts of Canada and Mexico. It stretched from Southern Mexico to Northern Canada, and from California to Virginia.〔Danz,18.〕
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「Great bison belt」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|