Changes in physiological and biochemical parameters of Barents Sea Fucus vesiculosus Linnaeus 1753 in response to low salinity
2022
Klindukh, Maria | Ryzhik, Inna | Makarov, Mikhail
The physiological and biochemical state of brown alga Fucus vesiculosus from the Barents Sea was studied while maintained in low salinity seawater (10 and 20 PSU) during a 14-day experiment. At both salinity levels, a decrease in respiratory rate and catalase activity and a significant increase in free amino acids content compared to control conditions (33 PSU) were observed. The photosynthetic activity of algae did not change. Excessive moisture accumulation by algal thalli was observed only at 10 PSU. The noted changes provide evidence that 20 PSU seawater is stressful for this species, but adaptation mechanisms bring physiological and biochemical parameters to the level of those of the control plants in 7–14 days. A long-term exposure of algae to 10 PSU is lethal. A high free amino acid concentration in the course of the experiment is indicative of their involvement in osmoregulation.
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