S. P. Zakharkova, M. S. Selinab, N. S. Vaninc, E. A. Shtraikherta, and N. Biebovd
a Pacific Oceanological Institute, Far East Division, Russian Academy of Sciences, Vladivostok, Russia
e-mail: zakharkov@poi.dvo.ru
b Institute of Marine Biology, Far East Division, Russian Academy of Sciences, Vladivostok, Russia
c Pacific Scientific–Research Fishery Center, Vladivostok, Russia
d GEOMAR, Kiel, Germany
Received January 17, 2006; in final form, August 17, 2006
Abstract—Using the data obtained in 1999–2000 during the spring bloom of phytoplankton (late May–early
June), the variability of the pigment concentrations, the phytoplankton biomass and species compositions, and
the hydrological conditions on the eastern shelf of Sakhalin Island was studied. The study resulted in revealing
135 microalgae species belonging to eight divisions. The most diversely presented were the Dinophyta
dinoflagellates and Bacillariophyta diatoms (70 and 53 species, respectively). The concentration of chlorophyll a in
the euphotic zone amounted, on average, to 3.8 mg/m3 in 1999 and 2.4 mg/m3 in 2000. It was shown that, in
the northern and southern parts of the coastal zone, the concentration of chlorophyll a and the phytoplankton
density in the spring were considerably different and depended on the hydrological conditions. In the north,
their maximum values were found in the area of the depth break and were determined by the tidal mixing. The
increased algae concentrations and temperature inversions at depths of 400–600 m confirm the downslope slid-
ing of the near-bottom shelf waters. In the southern part, the high phytoplankton concentrations in the surface
layer in 1999 confirmed by the monthly averaged estimates from the SeaWiFS satellite color scanner were
caused by the abnormal northward propagation of the Soya Current waters and by intense tidal mixing.
DOI: 10.1134/S0001437007040091
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