Context: 

Lake Retba is disappearing in Senegal. 

• In this lake, only a few microscopic algae and bacteria are found. 

About Lake Retba

• Lake Retba is better known as Lac Rose or the pink lake.

Lake Retba

• Reason for Pink Color: The pink color of the lake is due to the presence of halophilic green algae, specifically Dunaliella salina, containing red pigments.
• Source of Water: The lake Retba is isolated from the sea by sand dunes. Its fresh water comes from the seasonal water table in the dunes, which are higher than the lake. 
  • Thus the sea provides most of the lake’s water and all of its salt.
• It is situated approximately 35 km from Dakar, Senegal.

Challenges at Senegal’s Pink Lake

• Salt accumulation is the major problem for the pink lake. 

• Release of toxic substances from nearby industries, hotels, and tourism can bring harmful chemicals into the water, impacting the lake’s overall ecosystem. 
• Uncontrolled tourism can put a strain on the ecosystem which can cause pollution from boats and disturb wildlife.
• Infrastructure projects or land development near the lake can disrupt natural water flow and threaten surrounding dunes, contributing to the water balance.
• Excessive sand extraction and exploitation of surrounding areas can destabilize the lake’s delicate environment.

News Source: DownToEarth

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