MONO LAKE

 

اکوسیستم حوضه آبخیز مونو : اثرات کاهش سطح آب دریاچه

 The Mono Basin Ecosystem: Effects of Changing Lake Level 

The Mono Basin National Forest Scenic Area lies in eastern Californiaabout 300 mi north of Los Angeles and 190mi east of San Francisco.‎ The basinis walled in by the eastern escarpment of the Sierra Nevada to the west and by Great Basin ranges to the north, south, and east.‎ Consequently, no waternaturally flows out of the basin.‎ The only loss of water occurs throughevaporation and, since 1941, diversions of fresh water by the city of LosAngeles.‎

The Mono Basin is the hydrologic drainage basin for Mono Lake.‎ As aresult of millennia of evaporation from its surface, the lake (at 500,000 yearsone of the oldest in North America) has gradually increased in salinity, and it isnow about 2.‎5 times as saline as the Pacific Ocean.‎ The salinityand theparticular chemistry of the dissolved ionshas a large effect on the biota of thelake and the ecology of the basin.‎ The unusual chemistry of the lake is also responsible for one of its distinctive scenic attractions, the tufa towers.‎

 

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