| 翻訳と辞書 |
| Gunnison sage-grouse ： ウィキペディア英語版 |
Gunnison grouse
The Gunnison sage-grouse (''Centrocercus minimus'') is a species of grouse endemic to the United States. It is similar to the closely related greater sage-grouse (''Centrocercus urophasianus'') in appearance, but about a third smaller in size, with much thicker plumes behind the head; it also has a less elaborate courtship dance. It is restricted in range to southwestern Colorado and extreme southeastern Utah, with the largest population residing in the Gunnison Basin region in Colorado. Despite being native to a country where the avifauna generally is relatively well known, it was overlooked until the 1990s due the similarities with the sage grouse, and only described as a new species in 2000—making it the first new avian species to be described from the USA since the 19th century.〔 The description of ''C. minimus'' as a separate species is supported by a molecular study of genetic variation, showing that gene flow between the large-bodied and the small-bodied birds is absent.〔
Gunnison sage-grouse are notable for their elaborate courtship rituals. Each spring, males congregate on leks and perform a "strutting display". Groups of females observe these displays and select the most attractive males with which to mate. Only a few males do most of the breeding. Males perform on leks for several hours in the early morning and evening during the spring. Leks are generally open areas adjacent to dense sagebrush stands, and the same lek may be used by grouse for decades.
The numbers of this species are declining due to loss of habitat; their range has shrunk in historical times. Following petitions, the species has been proposed for listing under the Endangered Species Act, by the United States Fish and Wildlife Service.〔(Gunnison Sage-grouse ). Western State Colorado University (2013)〕
==Distribution==
Gunnison sage-grouse occur in seven counties in southwestern Colorado and one county in southeastern Utah.
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「Gunnison grouse」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.
|
|