. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Zooplankton and micronekton communities 955 170°W. - 60°N - 50° N SEASONAL RANGE IN BIOMASS (wet weight g/m^) Oceanic community Shelf-break community 13-37 7-180 Mixed community 7 - 60 Middle-shelf and coastal community 7-12 Figure 57-10. Diagrammatic representation of seasonal and spatial variations in wet-weight biomass in the southeast Bering Sea. very different domains over the shelf so that cross- shelf differences in productivity are not discernible. Studie
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Zooplankton and micronekton communities 955 170°W. - 60°N - 50° N SEASONAL RANGE IN BIOMASS (wet weight g/m^) Oceanic community Shelf-break community 13-37 7-180 Mixed community 7 - 60 Middle-shelf and coastal community 7-12 Figure 57-10. Diagrammatic representation of seasonal and spatial variations in wet-weight biomass in the southeast Bering Sea. very different domains over the shelf so that cross- shelf differences in productivity are not discernible. Studies recently completed in the southeast Bering Sea (Appendix 57-III) provide the first detailed evaluation of the contribution of zooplankton to secondary production in the oceanic/outer-shelf and middle-shelf domains. This approach assumes that the grazing stress is roughly proportional to the mass of dominant species occurring across the shelf at any time. Cross-shelf distributions of the numerically domi- nant herbivorous and omnivorous copepods were found to be closely correlated with the shelf fronts (Figs. 57-11, 57-12). The three oceanic species Calanus plumchrus, Eucalanus bungii bungii, and Metridia lucens dominated the mass field which is more developed on the oceanic side of the 80-m frontal system at about Station 11. At the same time, particulates in excess of 2 ppm (1 ppm = 10^ livci^ /ml) occurred landward of the middle front, whereas over the outer shelf and oceanic area, the particulates were patchy and less concentrated. Thirteen direct measurements of ingestion for the oceanic/outer-shelf and middle-shelf communities were made using shipboard incubations of unsorted zooplankton collections and naturally occurring plant stocks (Table 57-3). The resulting values were multiplied by the combined cross-shelf dry weight of the six dominant copepods and nauplii and expressed as the cross-shelf grazing (Fig. 57-13). The results of this analysis indicate that from th
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