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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Murmansk State Technical University
2017-03-01
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| Series: | Vestnik MGTU |
| Subjects: | |
| Online Access: | http://vestnik.mstu.edu.ru/show.shtml?art=1861&pdf=1 |
| Summary: | 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 |
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| ISSN: | 1560-9278 1997-4736 |