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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 Introduced trout in lake ecosystems ： ウィキペディア英語版 Introduced trout in lake ecosystems == Introduction of fish species == Since the recession of the last glaciation, isolated bodies of water high in mountain crevasses have been topographically separated from fish.〔Downen, M. R. (2004). Historic, Current, And Proposed Future Management of Sport Fish In High-Elevation Park Lakes. North Cascades National Park High Lakes Fishery Management.〕 Within Washington state a number of lakes in the Olympic and Cascade Mountains have been stocked since the early 20th century. Prior to the existence of a state wildlife management agency, the U.S. Forest Service stocked mountain lakes with rainbow trout (Oncorhynchus mykiss), cutthroat trout (Oncohynchus clarki) and eastern brook trout (Salvelinus fontinalis). High lake management of this era largely focused on improving sport fishing opportunities and secondarily establishing ecological balance. Natural reproduction of fish species, especially eastern brook trout, has led to overpopulation and “stunting” from starvation in low nutrient environments. The result has been decreased interest from fishermen, while causing large, negative impacts on natural lake biota.〔Pfeifer, B. (2007). Piscivore Control of Reproducing Fish in Washington High Lakes – Mixed Results. Inland and Alpine Fisheries. 2-45.〕 Addressing concerns for biodiversity can positively impact agendas for the conservation of species, as well as high lakes fishery management. 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「Introduced trout in lake ecosystems」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.