Partial floras of seaside ecotopes of estuaries of small rivers of the Yugorsky Shar Strait

УДК 581.93(268.45/.46)

Abstract

The paper analyzes 35 species of seaside partial floras on the coast of the Yugorsky Shar Strait, growing in ecotopes: low and medium level salt marshes, high level marshes, pebble-sand and rubble beaches, in salt lakes and microdepressions on marshes, Within the ecological groups 14 species are obligate halophytes growing on low and medium level salt marshes of tidal inundation, 15 species form communities on high level marshes, in the belt of surge influence. A reduction in the number of species of facultative halophytes, represented by only 5 species, was noted in comparison with the floras of the White Sea and other floras of the south-eastern Barents Sea. In the composition of latitudinal geographical groups, predominance of Arctic species and absence of boreal species was noted. In longitudinal groups the predominance of circumpolar elements is expressed, which is an important feature of Arctic coastal partial floras within the northern hypoarctic tundra zone. Two new species of vascular plants - Triglochin maritimum and Carex mackenziei - were noted for the flora of Vaigach Island. The former is an obligate halophyte with plurizonal distribution; the latter is an obligate halophyte with hypoarctic latitudinal distribution.