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Contemporary Problems of Ecology

2022 year, number 6

Community structure of oligochaetes (Annelida: Oligochaeta) of the Vychegda River in the zone of influence of wastewater from pulp and paper production

Institute of Biology of Komi Science Centre of the UB of the RAS, Syktyvkar, Russia
Keywords: biodiversity, pulp and paper production treated wastewater, Vychegda River


The paper contains original data on the composition and structure of Oligochaeta communities in the zone of influence of wastewater from a pulp and paper industry (the Vychegda River, the Northern Dvina River basin). 40 species and forms of oligochaetes have been identified. We found species having been earlier identified only in tributaries, in floodplain water bodies and in lakes of the Vychegda River basin. By the diversity index (Shannon index (HN) and Simpson index (DS)), evenness index (Pielow index (E)), and Whittaker (βw ) indices, the studied section of the river exceeds the control section by the species diversity. There is a significant increase in abundance and biomass of oligochaetes in comparison with section higher up the river. Based on the correlation analysis between the quantitative development indicators of oligochaetes with the environmental parameters (type of substrate, presence of algal growths and macrophyte, depth, chemical composition), the assessment of biotopic confinement of species (Fj) and conjugate between species (rA), we found out that the distribution of oligochaetes in the study area largely depends on the type of substrate. According to the obtained results on the assessment of diversity and distribution of oligochaetes in the zone of influence of wastewater from a pulp and paper industry, the appearance of technogenic parts with artificial substrate along the shore line leads to changes in the composition, diversity and quantitative development characteristics of benthic organisms.