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Phytomass and specific diversity of macrophytes of the Yenisei River on the stretch from Krasnoyarsk to the mouth of the Angara River were estimated. The investigation showed that littoral macrophyte vegetation clearly differs in specific composition and biomass in the deep water (H>0,8 m) and shallow water (H<0,7 m) zones. Potamogeton lucens principally dominates in deep-water communities; several dominating species are noticed in the shallow-water zone (P.perfoliatus, P.pectinatus, Elodea canadensis and some other species). The average biomass of deep-water macrophytes on the stretch of the river (431±101 g/m2 D.W., n=15, SD) was 2.5 times higher (p<0,01) than the biomass of shallowwater vegetation (172±81 g/m2, n=15). Phytomass loss observed in the two dominating species of pondweed, P. lucens and P.perfoliatus, during the season of vegetation was 3.1±3.4 % (n=17) and 11.6±7.8 % (n=37), respectively. Biomass production of P.lucens ranged from 240 to 630 g/m2, biomass production of P.perfoliatus was 360 g/m2. The estimated Shannon-Margalef index (based on dry biomass) revealed higher specific diversity of the shallow-water macrophyte vegetation as compared to the deep-water one on the majority of sampling sites, but the mean values did not differ statistically (0,90±0,78 и 0,53±0,55, n=15). The biomass and diversity of macrophytes of the Yenisei River did not change considerably at different distances away from the sources of technogenic pollution of the river.

Phytomass and Specific Diversity of Macrophyte Vegetation in the Middle Reach of the Yenisei River