The Black Sea becomes green and the reason is...

ArabiaWeather - The waters of the Black Sea off Odessa, southwestern Ukraine, have acquired a green color, prompting Russian scientists to investigate the reasons for this.

According to Dr. Yuri Dzhiboadze, deputy head of the Institute of Environmental Studies at the Russian Academy of Sciences, said toxic algae spread in the waters. But what is more dangerous than that is the effect of fresh water that flows into the sea on its bottom, causing sediments to rise to the surface. He explained that the possible cause of the sudden change in the color of the Black Sea off the coast of Odessa is cyanobacteria, which are microscopic blue-green algae. He confirmed in an interview with the Russian newspaper “Life” that the type of algae will be determined after analyzing water samples, but these organisms are what caused it repeatedly. In such environmental disasters.

Dgiboadze added that this phenomenon is very harmful, as it is not possible to drink water contaminated with toxic substances that affect people and many aquatic organisms. This is known as the “green tide” phenomenon.

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What are the blooms of harmful organisms?

The term “harmful algal bloom” refers to the presence of a visible or invisible patch of microalgae or plankton (phytoplankton), as a result of one or more species thriving in high density in the water. This bloom is accompanied by a clear discoloration of natural waters, and negatively affects ecosystems. Aquatic and human health. This bloom can last from a few days to several months. The spots contain organisms that can lower oxygen levels and kill marine life. After the algae die, the microbes that decompose them consume more oxygen. When these areas cover a large area for a long time, they are known as Dead zones, where neither fish nor plants can survive.

The water spots contain nearly 200 species of organisms that produce powerful toxins or cause damage through their enormous biomass. These organisms deplete oxygen and harm the beauty of the sea with strange colors, in addition to forming foam and foam.

The reason why the Black Sea turns green

For example, in 2019, the Black Sea turned the same shade of green; Due to the cyanobacteria Nodularia spugimena, which are toxic organisms that do not like highly salty water, and these bacteria spread after heavy rains brought chemical-rich fertilizers from agricultural fields. As the biologist explained, the same thing happened in 2023; Due to the well-known accident where large amounts of fresh water from the collapsed Kakhovskaya station brought liquid waste and chemicals, creating a favorable environment for the growth of these algae.

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Sources:

arabic.rt.