The contribution of solar radiation to the long-term dynamics of hydroecological parameters of lake ecosystems under variable nutrient loading (a case study on the Naroch Lakes)
T. I. KAZANTSEVA1, B. V. ADAMOVICH2, T. M. MIKHEEVA2, T. V. ZHUKOVA2, R. Z. KOVALEVSKAYA2, V. N. SOLNTSEV3
1Zoological Institute of RAS, St. Petersburg, Russia
2Belarusian State University, Minsk, Belarus
3National Medical Research Center. V.A. Almazova, St. Petersburg, Russia
Keywords: lake ecosystems, long-term dynamics, trophic state, cyclic components, PCA method, SSA method, interpretation of main factors, Naroch lakes
Abstract
Results of continuous monitoring of the Naroch lake system, which include the eutrophic lake Batorino, mesotrophic lake Myastro and oligo-mesotrophic lake Naroch, had been used to study the question of what factors most affect the long-term dynamics of the lake ecosystem, which are under a variable nutrient loading. The set of continuous series of average seasonal values of eight parameters from each ecosystem in 1978-2015 was analyzed using the methods SSA and PCA. The second principal component (F2), which contribution to the dynamics of lake ecosystems Myastro, Batorino and Naroch were 15.3 %, 20.5 % and 22.1 %, respectively, was associated with only three parameters that reflect the processes of formation and decomposition of organic matter. Comparison of the periods of the dominant cyclical components of the principal component F2 and related ecosystem parameters allowed us to interpret the second main factor behind these components as the activity of solar radiation.
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