. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 1 1 I \ I T Figure 69-7. Quantitative distribution of dams (28 species) taken by van Veen grab in the southeastern Bering Sea, 1975-76. on the mid-shelf indicate long-term biological re- sponses to unusual amounts of carbon. Furthermore, the large biomass of epifaunal predators (, snow crabs, red king crab) (Figs. 69-9 and 69-10), as well as a general increase in epifaunal biomass (composed of a mixed group of feeding types that would benefit from increased carbon influx; Fig. 69-11)


. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 1 1 I \ I T Figure 69-7. Quantitative distribution of dams (28 species) taken by van Veen grab in the southeastern Bering Sea, 1975-76. on the mid-shelf indicate long-term biological re- sponses to unusual amounts of carbon. Furthermore, the large biomass of epifaunal predators (, snow crabs, red king crab) (Figs. 69-9 and 69-10), as well as a general increase in epifaunal biomass (composed of a mixed group of feeding types that would benefit from increased carbon influx; Fig. 69-11) also reflects carbon enrichment of the mid-shelf. Bivalve mollusks are widely dispersed over the Bering Sea shelf and, as indicated above, are abun- dant on the mid-shelf. They are the most commonly consumed prey in the Bering Sea, and represent resources for which crabs, sea stars, bottom fishes, bearded seal, and walrus may compete (Table 69-1). King crabs consume hard-shell (Clinocardium, Cyclo- cardia, Chlamys, Serripes, and Spisula) as well as soft-shell (Nucula, Nuculana, Yoldia, Macoma, Siliqua, and Tellina) bivalves. Reduced numbers of clams are apparent at stations heavily populated by red king crab (Figs. 69-7 and 69-10). However, one common bivalve, the small soft-shell clam Nucula tenuis (Fig. 69-12), is rarely consumed by the king crab. Clinocardium, a preferred food of red king crab, is more common immediately north of king crab foraging areas (Fig. 69-13) (McDonald et Chapter 66, this volume). Although snow crabs prey


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