. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering I ill I I I I I l_ SILICATE Oig-at/l) PROBES 79 LEG 3 13-15 JUNE _l I I I I 1 L. Figure 56-7. Cross-shelf silicate distribution Leg III, PROBES, 13-15 June 1979 R/V Thomas G. Thompson (from Whitledge and Reeburg 1979). tribution and abundance of oceanic and shelf herbi- vores (Cooney and Geist 1978, Alexander and Cooney 1979, Iverson et al. 1979b). Oceanic grazers do not invade water shoreward of the middle front (Fig. 56-2). They are confined to the outer shelf
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering I ill I I I I I l_ SILICATE Oig-at/l) PROBES 79 LEG 3 13-15 JUNE _l I I I I 1 L. Figure 56-7. Cross-shelf silicate distribution Leg III, PROBES, 13-15 June 1979 R/V Thomas G. Thompson (from Whitledge and Reeburg 1979). tribution and abundance of oceanic and shelf herbi- vores (Cooney and Geist 1978, Alexander and Cooney 1979, Iverson et al. 1979b). Oceanic grazers do not invade water shoreward of the middle front (Fig. 56-2). They are confined to the outer shelf domain because of the hydrographic conditions which do not allow the extensive exchange of oceanic water with mid-shelf water. The oceanic group is composed of euphausiids and large calanoid copepods which winter in deep water beyond the shelf break and which move into the surface waters of the outer shelf domain in spring to feed on the spring phyto- plankton bloom. These animals are able to graze on large phytoplankton, including the large chain-forming diatoms, and some, especially the euphausiids, also may graze on Phaeocystis. The shelf herbivore group consists mostly of small zooplankton such as Pseudo- calanus spp. and Acartia spp., which are year-round residents. They overwinter as adults and reproduce and develop large populations after the first spring phytoplankton bloom. Experimental evidence sug- STATIONS 177 176 175 174 173 172 171 170 169 168 167 166 165 164 163 162 161 160 80 •g 100 f 120 Q. ? 140 160 180 200 220. Figure 56-8. Cross-shelf nitrate distribution. Leg III, PROBES, 13-15 June 1979 R/V Thomas G. Thompson (from Whitledge and Reeburg 1979).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hood, D. W. (Donald Wilbur), 1918-; Calder, John A; United States. Office of Marine Pollution
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