SPATIAL STRUCTURE OF POPULATIONS OF PSEUDOVIVIPAROUS ALPIGENE BLUEGRASS IN THE YAMAL PENINSULA (POA-ALPIGENA SUBSP, COLPODEA (FRIES,TH.) JURTZ. AND PETROVSKY, POACEAE)

The spatial structure of three populations of the pseudoviviparous alp igene bluegrass subspecies was studied in the shrub and typical subzon es of the tundra zone in the Yamal Peninsula. The analysis of four enz yme systems (GOT, EST, PGM, PGI) was performed to identify clones. Thi s taxon is capable of ''long-range'' dispersal by vegetative diaspores , and the emphasis is on the study of clone distribution along relativ ely long transects (4.5 and 6 km) laid in the river valley and on the coast of the Oh Bay (in the Kara Sea). The presence of clones over the greater part of the transect suggested that the specific way of veget ative reproduction promotes the distribution of pseudoviviparous alpig ene bluegrass to large distances along the sea coast, river valley, or the anthropogenically disturbed territory around the village. Ecologi cal plasticity allows some clones to survive in less favorable ecotope s in which these clones occur owing to the displacement of the riverbe d.