Environmental Conditions and Composition of Plankton
and Nekton in Epipelagic Layer of the Southern Sea of Okhotsk
and Adjacent Pacific Waters in Summer

V. I. Radchenko*, I. V. Mel’nikov*, A. F. Volkov*,
A. Yu. Semenchenko*, I. I. Glebov*, and A. A. Mikheev**

* Pacific Research Institute of Fisheries and Oceanography, Vladivostok, 690600 Russia

** Sakhalin Research Institute of Fisheries and Oceanography, Yuzhno-Sakhalinsk, 693000 Russia

Received April 4, 1995

Abstract—A comparative analysis is performed of the data obtained during complex large-scale surveys of the
epipelagic layer in the southern Sea of Okhotsk and in Pacific waters around the Kuril Islands in August–Sep-
tember 1994. The results are compared with the results of surveys carried out in 1991–1993. Long-term trends
are discovered concerning the dynamics of climatic and oceanographical parameters and of the composition
and structure of planktonic and nektonic communities. The distribution and abundance dynamics of hydro-
bionts are discussed in connection with the observed changes in environmental conditions.


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