. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . - 60°N - 50° N ZOOPLANKTON COMMUNITIES South Bering Sea Group — Calanus cristatus, C. tonsus {= plumchrus), Eucalanus bungii bungii, Racovitzanus antarc- ticus, Scolecithricella minor, Parathemisto japonica, and Oncaea borealis. ^ North Bering Sea Group —Calanus finmarchicus (probably C. glacialis), Parathemisto libellula. West Neritic Group — Podon leuckarti, Centropages mamurrichi, Acartia clausi, and A. longiremis. East Neritic Group — same as West Neritic Group. Figure 57-2. Large-sc
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . - 60°N - 50° N ZOOPLANKTON COMMUNITIES South Bering Sea Group — Calanus cristatus, C. tonsus {= plumchrus), Eucalanus bungii bungii, Racovitzanus antarc- ticus, Scolecithricella minor, Parathemisto japonica, and Oncaea borealis. ^ North Bering Sea Group —Calanus finmarchicus (probably C. glacialis), Parathemisto libellula. West Neritic Group — Podon leuckarti, Centropages mamurrichi, Acartia clausi, and A. longiremis. East Neritic Group — same as West Neritic Group. Figure 57-2. Large-scale distributions of zooplankton communities in the Bering Sea (from Zenkevitch 1963). Surveyor, and the University of Alaska research vessels Acona and Thomas G. Thompson. Zooplank- ton and micronekton were sampled with a variety of nets, including 60-cm bongo, 1-m ring, and 2-m NIO trawl. The 1-m net ( or mm Nitex) was generally fished vertically between the seabed and the surface or, at deeper locations, from 200 m to the surface. The bongo-net ( or mm Nitex) and NIO trawl ( mm nylon) collected organisms in open double oblique tows. The former was always equipped with digital flowoneters to measure volumes filtered and a time-depth recorder to monitor the maximum depth of the sample; although most samples were taken from the upper 100 m, the 2-m trawl was occasionally fished deeper than 500 m. Several hundred samples were processed to provide lists of species and determine the abun- dance of plankton organisms at various times and locations. The work sponsored by BLM/NOAA addressed distributional properties in four subareas of outer Bristol Bay defined bathymetrically (Fig. 57-3). These were identified as: (1) open ocean (depths greater than 200 m); (2) outer shelf (depths between 100 and 200 m); (3) central shelf (depths between 50 and 100 m); and (4) northern coastal (depths less than 50 m). A somewhat similar scheme was adopted by PROBES
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