. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . CS 9^"" Figure 66-14. trawl. Distribution of Macoma calcarea based on collections taken with a grab, pipe dredge, clam dredge, and otter fine sand and coarse silt (Table 66-10). Nucula tenuis, N. fossa, and Y. amygdalea are primarily deposit feeders; M. calcarea and T. lutea may also function as suspension feeders (Filatova and Barsanova 1964, Kuznetsov 1964). The filter-feeding bivalves Cyclo- cardia crehricostata, Clinocardium ciliatum, and Spisula polynyma may also occur in
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . CS 9^"" Figure 66-14. trawl. Distribution of Macoma calcarea based on collections taken with a grab, pipe dredge, clam dredge, and otter fine sand and coarse silt (Table 66-10). Nucula tenuis, N. fossa, and Y. amygdalea are primarily deposit feeders; M. calcarea and T. lutea may also function as suspension feeders (Filatova and Barsanova 1964, Kuznetsov 1964). The filter-feeding bivalves Cyclo- cardia crehricostata, Clinocardium ciliatum, and Spisula polynyma may also occur in similar sediment regimes, and the former two species are probably able to utilize resuspended detrital debris over the water- sediment interface in such areas (Hoskin et al. 1976, Hoskin 1977, Mueller et al. 1976). The organic carbon of marine sediments may be derived from remote regions (allochthonous), such as river systems, or produced in the overlying water column (autochthonous), or both. The quality and quantity of the organic carbon available to benthic organisms are related to the distance and source of allochthonous material, the productivity and carbon coupling activities in the overlying water column, suspended load-type of sediment, particle size and settling rates, and resuspension mechanisms present. Organic carbon is concentrated in sediments near Togiak Bay and the outer Bering shelf regions (Figs. 66-1 and 66-7). In these regions, the organic carbon content of sediments is directly proportional to the clay content of the sediment (Sharma 1972). It has
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