EN
The changes recorded in the last 20 years in the photobenthos of the Gulf of Gdansk are especially noticeable in Puck Bay and have led to the degradation of the Zostera marina underwater meadows.One important reason for this is the mass growth of filamentous brown algae from the genera Ectocarpus and Pilayella, as result of which the number of species and the overall biomass of the vegetation have fallen, and the filamentous brown algae have become dominant.The range of the vascular plants, including that of Zostera marina, has shrunk very considerably.