. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 175 170' 165' 160" Figure 69-12. Quantitative distribution of the clam Nucula tenuis in the southeastern Bering Sea, 1975-76. ward flux, in which the carbon of higher forms moves toward lower trophic components of the system. In effect, forms such as sponges, copepods, and bivalve moUusks may eat the gametes and larvae of a variety of large invertebrates and fishes (Isaacs 1976). As discussed in this chapter (see also appropriate chapters in Section I, Volume 1 and Sections VII and
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 175 170' 165' 160" Figure 69-12. Quantitative distribution of the clam Nucula tenuis in the southeastern Bering Sea, 1975-76. ward flux, in which the carbon of higher forms moves toward lower trophic components of the system. In effect, forms such as sponges, copepods, and bivalve moUusks may eat the gametes and larvae of a variety of large invertebrates and fishes (Isaacs 1976). As discussed in this chapter (see also appropriate chapters in Section I, Volume 1 and Sections VII and X of this volume), biological processes of the southeastern Bering Sea are enhanced by a series of three oceanic fronts acting in conjunction with seasonal ice cover. These fronts play a major role in the control of biological processes leading to spatial separation of a pelagic food web within the outer-shelf zone and a benthic food web within the middle-shelf zone. Biomass and density of large zooplankters, squid, and fishes, and densities of birds and fin whales are highest offshore in the outer-shelf zone (Iverson et al. 1979; Bakkala and Smith 1978; C. Bublitz, unpub. data). In contrast, the benthic food web, supporting the greatest densities and biomass of benthic organisms in the southeastern Bering Sea, is concentrated in the middle-shelf zone. Further understanding of frontal systems on the shelf of the southeastern Bering Sea, as well as of their potential role in the northeastern Bering Sea, is essential to comprehend food dynamics of this very productive sea.
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