Morphological changes in submerged Fucus vesiculosus (L) (Phaeophyta) along the salinity gradient of the River Keret estuary, Russia

Morphological variation in submerged Fucus vesiculosus (L) was studied along the salinity gradient in the River Keret estuary, White Sea, Russia. Salinity decreased from 24 to 2 psu from the White Sea up the River Keret estuary within a distance of a few hundred metres. Almost all measured vegetative characteristics of F. vesiculosus showed a decreasing trend as salinity decreased. According to earlier studies, changes in the morphological characteristics of River Keret F. vesiculosus are parallel to changes in Baltic Sea F. vesiculosus along a decreasing salinity gradient.