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A time-series sediment trap experiment was conducted at 3,200 m in the Bering Sea Basin (53°30′N, 177°00′W; 3,788 m) during 1991 and 1992 to determine seasonal variation in the processes of biological... production in the surface water of the Bering Sea. The seasonal pattern of downward fluxes of organic matter in the Bering Sea was characterized by three high peaks in flux (May, July-August, and October), each with different sinking properties. The mass flux showed maximum value in May, and the sinking particles were of small size with low organic content, composed mostly of diatoms. The bulk of sinking particles in July-August was small diatoms, though there were contributions of crustacean zooplankton remains. In October, sinking particles showed a relatively high contribution of foraminifera. In winter the particles were characterized by both foraminifera and crustacean zooplankton. We propose that seasonal variations in the flux and composition of sinking particles in the Bering Sea were directly influenced by the proportion of mixing among materials originating from smaller diatoms, larger foraminifera, and crustacean zooplankton. Judging from the seasonal variation of mass flux and the nature of the particles obtained from the sediment trap experiment, the biological production in the surface water of the Bering Sea was characterized by high primary production (about 250 g C per m2 per yr) maintained by smaller diatoms and the low grazing pressure of larger crustacean zooplankton throughout a year.続きを見る
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