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Vol. 19 (2016 year), No. 1, DOI: 10.21443/1560-9278-2016-1/2

Denisov D. B., Val'kova S. A., Kashulin N. A.
Ecological peculiarities of periphyton and zoobenthos of freshwater ecosystems of the Khibiny massif (the Kola Peninsula)

Freshwater ecosystems of the Khibiny massif have been investigated. The differences in species composition and community structure of zoobenthos and algae periphyton have been revealed depending on the hydrological and geochemical factors as well as the level of anthropogenic impact. The apatite industries waste waters effects on aquatic ecosystems have been analyzed using the "basin approach"; the main factors of the aquatic organisms function in different parts of a particular watershed depending on the type of terrain, the structure of river valleys, vegetation and soil, as well as hydrological and geochemical features have been determined. The ways of transformation of species composition, abundance and taxonomic diversity of aquatic organisms in places of receipt of the apatite mines waters, sewage treatment plants, and flowing wells have been discussed

(in Russian, стр.0, fig. 0, tables. 0, ref 0, Adobe PDF, Adobe PDF 0 Kb)

Vol. 20 (2017 year), No. 1, DOI: 10.21443/1560-9278-2017-20-1/2

Terent'eva I. A., Kashulin N. A., Denisov D. B.
Estimate of the trophic status of subarctic Imandra Lake

The object of study is Imandra Lake – the largest reservoir of the Murmansk region. The lake is being influenced by the long-term and multi-factorial activities of mining and ore processing industries, air pollution and energetics. Moreover, the drain of municipal sewage from the large settlements situated on the lake's watershed makes a serious contribution to water pollution. As a result the lake has accumulated a significant amount of pollutants and nutrients that resulted currently in an increase of the toxic load on the lake system. One of the main ecological problems also is the intensification of the anthropogenic eutrophication processes. The aim of this study is to evaluate the current trophic status of Imandra Lake using the trophic index (TSI) with the average annual values of the parameters: chlorophyll, total nitrogen, total phosphorus, and total organic carbon and to find the dynamics of these parameters' changes during more than 20-year period. The study of the trophic status of Imandra Lake has been performed for the period 1991–2013 yrs. using the trophic state index developed by Carlson, Kratzer and Bresonik, Dunalska. According to the calculated values of the indexes Bolshaja Imandra Lake corresponds to eutrophic-mesotrophic trophic status, Yokostrovskaya Imandra Lake could be described as mesotrophic. Babinskaja Imandra Lake that subjected to essential nutrient loading is close to the oligotrophic trophic status. However, some parts of Babinskaja Imandra Lake refer to the mesotrophic state due to influence of industrial, household and heated water of the Kola atomic power station. Thus, this part of Imadra Lake could be considered as a meso-oligotrophic status. It has been established that currently nitrogen is a limiting factor for development of algae in Imandra Lake. Based on the mathematical Vollenweider model the critical phosphorus loading values to control such an important nutrient element as phosphorus have been calculated.

(in Russian, стр.8, fig. 1, tables. 5, ref 20, Adobe PDF, Adobe PDF 0 Kb)