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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Druckformat: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v8.i3.50
pages 255-273

The summer-autumn phytoplankton in the Golden Horn Bay (the Sea of Japan) under conditions of anthropogenic pollution

A. A. Begun
A.V. Zhirmunsky Institute of Marine Biology of the Far East Branch of the RAS, 17, Palchevsky St., Vladivostok 690041, Russia

ABSTRAKT

The qualitative and quantitative composition of phytoplankton in the Golden Horn Bay (the impact area) and in the Rynda Bay (the background area) (the Sea of Japan) was studied in the summer-autumn period of 2000. Revealed were 76 species and intraspecific taxa of microalgae. A high similarity level of species lists is observed in phytoplankton of the Golden Horn and Rynda Bays (the Serensen-Chekanovsky coefficient is equal to 0.83). In the Rynda Bay the maximal density of phytoplankton was registered in October (8.7 mln cells/L), in this case the diatomic alga Skeletonema costatum (Grev.) Cl. was dominant (91.7%). In the Golden Horn Bay the maximum density of phytoplankton was registered in the area of berth 44 in June (1.7 mln cells/L), flagellate microalgae predominating (45.5%). Predominance of the flagellate community of microalgae over diatomic algae was observed in the summer-autumn period in the Golden Horn Bay (20−78% in the area of berth 42 and 24−82% in the area of berth 44). Euglenophyta (Eutreptiella gimnastica Throndsen) and Chlorophyta (Pyramimonas sp.) were the most abundant in the area of berth 44 (388 and 387 thousand cells/L, respectively), that evidences for a high level of organic pollution of the bay. On the whole, the density of dominant and subdominant species among flagellates increases in the succession of the Rynda Bay berth 42 berth 44. The maximal decrease in the Shannon species diversity index (0.2 and 0.7 information bit, respectively) is observed in the Rynda Bay in August and October, that was associated with the bloom of S. costatum. A comparison of the results of observation obtained by the phytoplankton of background and impact areas has shown that in the period of investigation the Rynda Bay (especially of its inmost area) was subject to a considerable extent to the anthropogenic influence including eutrophication and thermal pollution.