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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Wyoming toad ： ウィキペディア英語版 Wyoming toad The Wyoming toad or Baxter's toad (''Bufo baxteri'' syn. ''Anaxyrus baxteri'') is an extremely rare amphibian that exists only in captivity and within Mortenson Lake National Wildlife Refuge in Wyoming in the United States. The Wyoming toad was listed as an endangered species in 1984, and listed as extinct in the wild since 1991. Before the sharp declines occurred, this toad was classified as a subspecies of the Canadian toad. ==History== The Wyoming toad, common up until the 1950s, became significantly fewer in number in the late 1970s, especially between the years of 1975 to 1978. Two years later, in 1980, experts estimated that there were approximately 25 individuals remaining in the wild.〔Baxter, G. T., et al. (1982). (The status of the Wyoming toad (''Bufo hemiophrys baxteri''). ) ''Environmental Conservation'' 9(04), 348.〕 Before this sharp decline in population, Wyoming toads were commonly found in the floodplains, ponds, shallow lakes, and seepage pools within the Laramie Basin located in Albany County, Wyoming. Researchers had noted that the species was found abundantly in the region since 1952. However, starting in 1975, Baxter & Stromberg noticed that the population of the Wyoming toad had decreased significantly. Their extreme rarity, documented between 1976 and 1978 revealed no remaining wild populations.〔 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「Wyoming toad」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.