Biomorphology and population structure of Plantago maritima L. in intertidal zone on the holarctic seas coasts

The results of the research on the Plantago maritima L. population (fam. Plantaginaceae) that is dominant species of salt marsh communities in the intertidal zone on the Western coast of the White Sea near the village Kolezhma (North Karelia) are presented. This coast has been chosen as a reference one because it is characteristic for all coasts of the Holarctic Seas. It is shown that at the population level the structural parameters change per the flood gradient; vitality-ontogenetic structure of the population, bio- morphological structure and reproductive effort of generative individuals also vary.