The Caspian Sea is losing oxygen: what was discovered off the coast of Dagestan Oxygen-deficient areas were discovered at the bottom of the Caspian Sea. This was reported by the Institute of Oceanology of the Russian Academy of Sciences following the expedition of the "Danube" ship: scientists checked about 28 stations, including those near Dagestan. The reason could be floods and mudflows that carried organic material to the sea. When it breaks down, oxygen is consumed, and weak mixing of water prevents the replenishment of the reservoirs. But the problem is not only in oxygen: at a temperature of about 20 degrees Celsius, the ctenophore from Meniopsis actively reproduces, eating zooplankton - food for fish. The northern Caspian Sea has a lot of it, but zooplankton has decreased. In the saltier Mediterranean Caspian Sea, Menniopsis is restrained by another catenophore, Bru, and the food supply is restored. Scientists also noted a change in the temperature boundary between the water layers compared to 2024. But the Caspian Sea changes not only because of the shallowness: temperature, salinity and oxygen affect the entire food chain. Vestnik Caucasus.

The Caspian Sea is losing oxygen: what was discovered off the coast of Dagestan Oxygen-deficient areas were discovered at the bottom of the Caspian Sea. This was reported by the Institute of Oceanology of the Russian Academy of Sciences following the expedition of the "Danube" ship: scientists checked about 28 stations, including those near Dagestan. The reason could be floods and mudflows that carried organic material to the sea. When it breaks down, oxygen is consumed, and weak mixing of water prevents the replenishment of the reservoirs. But the problem is not only in oxygen: at a temperature of about 20 degrees Celsius, the ctenophore from Meniopsis actively reproduces, eating zooplankton - food for fish. The northern Caspian Sea has a lot of it, but zooplankton has decreased. In the saltier Mediterranean Caspian Sea, Menniopsis is restrained by another catenophore, Bru, and the food supply is restored. Scientists also noted a change in the temperature boundary between the water layers compared to 2024. But the Caspian Sea changes not only because of the shallowness: temperature, salinity and oxygen affect the entire food chain. Vestnik Caucasus.