Lake Natron

Missing image
Lake_Natron_from_space_STS-55.jpg
Lake Natron, here from 300 km overhead, changes colors with the seasons.

Lake Natron is a lake located in northern Tanzania, close to the Kenyan border, in Africa's Great Rift Valley.

The alkali salt crust on the surface of the lake is often colored red or pink by the salt-loving microorganisms that live there. And the lake is the only breeding area for the 2.5 million Lesser Flamingoes that live in the valley. These flamingoes flock along saline lakes in the region, where they feed on Spirulina (a blue-green algae with red pigments). Lake Natron is the only breeding location for Lesser Flamingoes because its caustic environment is a barrier against predators trying to reach their nests. The temperatures in the mud can reach 50 degrees Celsius (120 degrees Fahrenheit), and depending on recent rainfall, the alkalinity can reach a pH of 9 to 10.5 (almost as alkaline as straight ammonia). Even more amazing than the ability of the flamingoes to live in these conditions is the fact that an endemic species of fish, the alkaline tilapia, thrives in the waters at the edges of the hot spring inlets. Because of its unique biodiversity, Tanzania named the Lake Natron Basin to the Ramsar List of Wetlands of International Importance on 2001 July 4.

Original entry was from the NASA Earth Observatory; [1] (http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=10852)

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