. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 952 Plankton ecology. - 60° N - 50° N ZOOPLANKTON AND MICRONEKTON COMMUNITIES Oceanic and Outer-Shelf Community Calanus cristatus C. plumchrus Eucalanus bungii bungii Metridia pacifica Pseudocalanus spp. Oithona similis Parathemisto pacifica Thysanoessa longipes T. inermis Eukrohnia hamata Sagitta elegans Middle-Shelf and Coastal Community Pseudocalanus spp. Acartia longiremis Oithona similis Calanus glacialis C. marshallae Parathemisto libellula Thysanoessa rasc
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 952 Plankton ecology. - 60° N - 50° N ZOOPLANKTON AND MICRONEKTON COMMUNITIES Oceanic and Outer-Shelf Community Calanus cristatus C. plumchrus Eucalanus bungii bungii Metridia pacifica Pseudocalanus spp. Oithona similis Parathemisto pacifica Thysanoessa longipes T. inermis Eukrohnia hamata Sagitta elegans Middle-Shelf and Coastal Community Pseudocalanus spp. Acartia longiremis Oithona similis Calanus glacialis C. marshallae Parathemisto libellula Thysanoessa raschii Sagitta elegans Nearshore Community Acartia clausi Podon sp. Centropages abdominalis Eurytemora pacifica Evadnesp. Pseudocalanus spp. E. herdmani Tortanus discaudatus Figure 57-5. Large-scale distributions of zooplankton and micronekton communities representative of the eastern Bering Sea. Bering Sea in the spring, summer, fall, and late winter months (Fig. 57-7). These values are used to com- pute the seasonal variation in carbon (assumed to be 45 percent of the dry weight: Ikeda and Motoda 1978) in the biologically defined regions on both sides of the frontal system at 80 to 100 m (Fig. 57-8). The stock of oceanic species is greatest in May and June and lowest in November. Conversely, the shelf zooplankton stocks do not reach a maxi- mum until late summer and are lowest in the spring. These collections were made in 1975 and 1976, a period of below-normal temperatures and extreme sea-ice cover in winter. It is not known how the presence of sea ice may have affected seasonality in the animal plankton stocks. This sequencing of oceanic and shelf stocks is in general accord with published accounts of the known life cycles of the dominant species in these two major hydrographic domains (Vinogradov 1968). As men- tioned previously, the bulk of the oceanic popula- tion overwinters at depth. The large calsmoid cope- pods Calanus cristatus and C. plumchrus reproduce. Please note
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