Phytoplankton Communities of the Volga Reach Open Shallows of the Rybinsk Reservoir in the Affected Area of Common Heron (Ardea cinerea L.) Vital Activity Products
E. G. SAKHAROVA, L. G. KORNEVA
Papanin Institute of Biology of Inland Waters, RAS, 152742, Yaroslavskaya oblast, Nekouzskii region, Borok
Keywords: фитопланктон, водохранилища Волги, Рыбинское водохранилище, открытое мелководье, серая цапля, эвтрофирование, экотон, phytoplankton, reservoirs of the Volga, Rybinsk Reservoir, open shallows, common heron, eutrophication, ecotone
Abstract
The site of open shallows of the Volga Reach in the Rybinsk Reservoir (Volga) subjected to impact of common heron colonies was studied in 2009-2011. Some changes in phytoplankton community composition typical of water trophic level rise were noticed. Floristic wealth reduction along with increase in biomass due to phytophlagellates - cryptophytes, euglenales, dinophytes and chrysophytes, as well as flagellar forms of green algae were registered at the heronries. Changes in phytoplankton communities were temporary and connected with herons nesting period, which allows to treat the studied site as “traumatic” ecotone.
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