. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . <^\ ^~-~--__^ /- /^C^ Jz^Unimok Pass Figure 66-22. Distribution of Spisula polynyma based on collections taken with a grab, pipe dredge, clam dredge, and otter trawl. combined (Tables 66-12 to 66-17) is considered, no cases of total year-class failure were observed. Cur- rently, the factors affecting recruitment success in bivalve populations of the area are unknown. The age composition of all six species was characterized by the occurrence of numerous older clams (Tables 66-12 to 66-
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . <^\ ^~-~--__^ /- /^C^ Jz^Unimok Pass Figure 66-22. Distribution of Spisula polynyma based on collections taken with a grab, pipe dredge, clam dredge, and otter trawl. combined (Tables 66-12 to 66-17) is considered, no cases of total year-class failure were observed. Cur- rently, the factors affecting recruitment success in bivalve populations of the area are unknown. The age composition of all six species was characterized by the occurrence of numerous older clams (Tables 66-12 to 66-17). The data for these calculations are taken primarily from areas where these species are abundant and predators are rare or absent (Tables 66-11, 66-22, and 66-23, Fig. 66-26). Neiman (1964) observed a similar age-distribution in the southeastern Bering Sea (Table 66-21) and suggested that the large number of older clams indicated that predation was not a significant factor affecting bivalve densities there. Since Nuculana fossa, Yoldia amygdalea, and Macoma calcarea are small species, predators probably do not discriminate between old and young by size. The typically low densities of N. fossa, Y. amygdalea.
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