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Elgygytgyn Lake
Lake El'gygytgyn (Chukchi: Эльгыгытгын) is an impact crater lake located in the Chukotka Autonomous Okrug in northeast Siberia, about 150 km southeast of Chaunskaya Bay. It is drained to the southeast by the Enmybaam branch of the Belaya River. It is approximately 12 km in diameter and has a maximum depth of 174 m +/- 2m. The lake is centered within an impact crater with a rim diameter of 18 km that formed 3.6 million years ago during the Pliocene).
The lake is of particular interest to scientists because it has never been covered by glaciers. This has allowed the uninterrupted build-up of 400 m of sediment at the bottom of the lake, recording information on prehistoric climate change.
In 2009, scientists from the University of Massachusetts Amherst drilled into the lake sediments to analyze past climates.〔http://www.boston.com/lifestyle/green/articles/2009/03/16/down_under_up_north/〕
==Fauna==
The conditions in the El'gygytgyn lake are extremely severe for fish life. Even so, there are three species permanently inhabiting the lake's harsh aquatic environment.〔( Fly Fishing Russia - The Elgygytgyn Lake, Chukotka )〕 These are three types of char: ''Salvelinus boganidae'', ''S. elgyticus'' (Small-mouth char) and ''Salvethymus svetovidovi'' (long-finned char).〔(Salvethymus svetovidovi )〕 The two latter species are endemic to the El'gygytgyn lake. The golets (''Salvelinus alpinus'', (ロシア語:голец)) has been introduced recently.〔(Arctic char ''(Salvelinus alpinus)'' in the lake )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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