Vertical distribution of macrobenthic organisms in various sediments of the shelf area in the Sea of Japan with special reference to polychaetous annelids.

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Abstract
The vertical distribution of macrobenthic organisms in the sediment was studied at 6 sampling stations around the Sado Strait in the Sea of Japan using a small type USNEL box corer (sampling area: 0.1m2). Vertical profiles differed between the sandy and the muddy bottoms. Although majority of organisms were concentrated in the near-surface layer of sediment in the sandy bottom, a considerable portion of the fauna tended to penetrate into the deeper layer in the muddy bottom, the peak of the vertical profile curve shifting downward in the nearshore stations. Polychaetous annelids showed various types of vertical distribution. An analysis of the vertical distribution of each polychaete species revealed that overlapping of the main occurring ranges was not so serious among some dominant species collected at the same station.

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