New Algae Species Threatens Caspian Sea's Delicate Balance

For the first time, a species of dinophyte algae known as Ceratium tripos var. balticum has been found in the Middle Caspian waters.

These plankton-related species participate in water blooms and can affect the ecosystem by reducing the oxygen content in the water, Orda.kz reports.

All-Russian Research Institute of Fisheries and Oceanography publication notes that identifying these algae based on appearance was quite challenging. This is mainly due to the significant changes in the shape and size of their cells. In the case of Ceratium, the cellular "horns" can vary greatly — they can elongate or even disappear, making classification difficult.

The Caspian Sea has already faced the challenges posed by invasive phytoplankton species.

In 1934, the diatom Pseudosolenia calcar-avis entered the area, rapidly displacing smaller phytoplankton species. However, its cells were too large for most algae-eating animals, which added stress to the local ecosystem and its species.

While alive, these new algae will likely remain largely inaccessible to most marine animals.

Research indicates that this new algae is rapidly spreading and could lead to profound changes in the Caspian Sea ecosystem, including decreased zooplankton biomass. This decline could, in turn, jeopardize the food supply for Caspian sprats and reduce the sea's overall productivity.

Additionally, experts have observed a growing number of alien species in the Caspian Sea, mainly due to increased pathways for organisms to enter the water and favorable conditions created by climate change that promote their survival and spread.

The Caspian Sea has experienced declining water levels for over a decade, which have worsened in recent years. Environmentalists attribute this trend to climate change and human activity. Experts predict that if the shallowing continues at this rate, the region could face an environmental disaster within the next decade.

The declining fish population in the Caspian Sea, caused by the shallowing of the sea, changes in river beds, and the lack of spring floods, compounds these issues. Fishermen and environmentalists are raising alarms about the impending depletion of the region's water resources.

Original Author: Ruslan Loginov