Zooplankton of the Hollows of the South-Pribelomorian Mire Ilasskoye (Russia)

Abstract

The paper presents the data of the study of the fauna of zooplankton communities of the hollows of the South-Belomorian mires (Arkhangelsk oblast), carried out in may-august 2021. The zooplankton of the hollows the mire Ilasskoye contains 37 species of planktonic invertebrates, including 15 species of rotifers, 18 species of cladocerans, and 4 species of copepods. The planktonic fauna is represented mainly by phytophilic, sphagnophilic, acidophilic species of rotifers and crustaceans. Differences in the species size of zooplankton depending on the level of watering of the hollows are revealed. The high rates of quantitative development are characteristic for the zooplankton communities (649.7 ± 53 thous. ind./m3; 4.36 ± 0.4 g/m3). The trophic structure of zoocenoses was dominated by secondary filtrators and verticators, among which the crawling-floating forms of cladocerae and rotifers prevailed, which indicates the predominant role of detritus in the circulation of substances and energy in water bodies of this type.