Kovalevsky Institute of Marine Biological Research RAS 2 Nakhimov, Sevastopol, 299011, Russia Received 09.01.2017, received in revised form 11.02.2017, accepted 03.03.2017 The comparative analysis of an impact of the trophic level on the redistribution of plutonium radionuclides in marine ecosystems at different spatial scales was carried out for semi-closed coastal areas, the western part of the Black Sea, open areas of the Black and Mediterranean seas. <...> The quantitative characteristics of radioecological processes of the sedimentation of 239+240 Pu radionuclides in bottom sediments in the coastal and open areas of the Black Sea, as well as effective half-life of 239+240 Pu in the Black Sea surface waters were determined. <...> It was shown that an increase in water trophic level, causing an increase of the suspended matter concentration and sedimentation rate, played a significant role in the redistribution of 239+240 Pu. <...> There was a strengthening of plutonium pedotrophic properties and increase the rate of self-purification of the Black Sea surface water regarding the plutonium radionuclides by their redistribution into the bottom sediments. <...> Trophic level of sea waters affected the values of the radioecological parameters of the 239+240 areas, the radioecological status of the sea in the basin regarding the radionuclides of plutonium, and biogeochemical type of Pu behavior in the seas. <...> Effect of sea water trophic level on migration and deposition of man-made plutonium radionuclides. <...> All rights reserved * Corresponding author E-mail address: ntereshchenko@yandex.ru Pu migration at studied – 20 – Nataliya N. <...> Effect of Sea Water Trophic Level on Migration <...>