. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . JFMAMJJASONDJ MONTH Figure 57-8. Seasonal variation in zooplankton carbon for the soutiieast Bering Sea; May 1975-April 1976. are frequently encountered in this region. The presence in 1977, 1978, and 1979 of large copepod populations at the shelf break demonstrates the con- sistency of this phenomenon. A more detailed view of the zooplankton biomass distribution and seasonal variation can now be pro- posed for the southeast Bering Sea, including Bristol Bay and the oceanic waters betwee
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . JFMAMJJASONDJ MONTH Figure 57-8. Seasonal variation in zooplankton carbon for the soutiieast Bering Sea; May 1975-April 1976. are frequently encountered in this region. The presence in 1977, 1978, and 1979 of large copepod populations at the shelf break demonstrates the con- sistency of this phenomenon. A more detailed view of the zooplankton biomass distribution and seasonal variation can now be pro- posed for the southeast Bering Sea, including Bristol Bay and the oceanic waters between the Pribilof Islands and Unimak Pass (Fig. 57-10). The most obvious feature is the high-density copepod com- munity at the shelf break. Although the observa- tions are not available, oceanographic continuity suggests that these populations probably also exist further to the north in regions where the shelf-break front produces adequate food for the oceanic grazers. Cooney et al. (in press) note that larval walleye pollock (Theragra chalcogramma) depend entirely on pelagic foods (copepod eggs, nauplii, and cope- podids), and that the rapidly growing juveniles 20-30 mm in length and longer regularly ingest the largest oceanic copepods. This behavior of pollock, together with the fact that the foreign fishery for pollock in the slope and outer-shelf waters is one of the largest single-species fisheries in the world, indi- cates the trophic importance of the shelf-break cope- pods in the eastern Bering Sea. Furthermore, Nasu (1974) concludes that along the eastern shelf, waters g xloVm^Q 1-20
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