Effect of a Colony of the Grey Heron (Ardea cinerea L.) on Lacustrine Plankton and Essential Polyunsaturated Fatty Acid Content in Seston and Zooplankton
a:2:{s:4:"TEXT";s:252:"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";s:4:"TYPE";s:4:"html";}
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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