Effect of a Colony of the Grey Heron (Ardea cinerea L.) on Lacustrine Plankton and Essential Polyunsaturated Fatty Acid Content in Seston and Zooplankton
А. V. Krylov1, М. I. Gladyshev2, D. B. Kosolapov1, N. N. Sushchik2, L. G. Korneva1, O. N. Makhutova3, D. V. Kulakov1, G. S. Kalachova3, O. P. Dubovskaya3
1 I.D. Papanin Institute of Biology of Inland Waters RAS
2 Institute of Biophysics of SB RAS; Siberian Federal University
3 Institute of Biophysics of SB RAS
krylov@ibiw.yaroslavl.ru
Keywords: shallow lake, plankton community, heron, essential polyunsaturated fatty acids
Pages: 59-68
Abstract
It is shown that definite changes of some indicators of plankton structure occur in a zone of input of the products of heron vital activity in eutrophic-hypertrophic lake, which points to an increase in organic and inorganic load. These changes are similar to the changes observed during anthropogenic eutrophication. Also a number of indicators, which are usually not registered under increased anthropogenic influence, are revealed. Results of the studies of polyunsaturated fatty acids in seston and zooplankton indicated that a smaller amount of diatoms and components of terrestrial origin were present in zooplankton food from the site near a colony of herons, in comparison with the food from the background site of the lake. Zooplankton developing in the zone of influence of the herons colony is a higher-quality food for fish; it is rich in DHA, which is a fatty acid essential and necessary for their growth and development.
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