. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering STATIONS 177 176 175 174 173 172 171 170 169 168 167 166 165 164 163 162 161 160 E £ a 4) o. STATION DATE • 2066 140579 ? 2075 150579 1 1 1 1 Mg chl a/m 1006 1459 20 30 40 50 ng chl a/I 10 Figure 56-6. Wind-mixing effects on the nitrate and ciilorophiyU profiles on PROBES Leg II, 1979 R/V Thomas G. Thompson. total phytoplankton numbers at some middle shelf domain stations during late June 1978. Evidence from nitrogen-15 kinetic uptake experiments sug- gests that
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering STATIONS 177 176 175 174 173 172 171 170 169 168 167 166 165 164 163 162 161 160 E £ a 4) o. STATION DATE • 2066 140579 ? 2075 150579 1 1 1 1 Mg chl a/m 1006 1459 20 30 40 50 ng chl a/I 10 Figure 56-6. Wind-mixing effects on the nitrate and ciilorophiyU profiles on PROBES Leg II, 1979 R/V Thomas G. Thompson. total phytoplankton numbers at some middle shelf domain stations during late June 1978. Evidence from nitrogen-15 kinetic uptake experiments sug- gests that regenerated nitrogen (ammonium and urea) is the primary nitrogen source for stage-Ill phyto- plankton species (Goering and Iverson, unpublished). Apparently Rhizosolenia alata is capable of excelling other phytoplankton species in taking up silicic acid from very low ambient silicic acid concentrations and of growing with only weakly silicified frustules. Controversy exists over which ecological factors are most important in determining the course of phy- toplankton succession. Major arguments usually center around the roles that ambient concentration of nutrients, light regimes, and grazing play in the suc- cessional changes observed in nature. In the shelf domains of the southeast Bering Sea the patterns of phytoplankton growth, biomass, and species composi- tion appear to be very directly influenced by the dis- 80 E 100 f 120 Q. Q 140 160 180 200. 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 Assessment; United States. Bureau of Land Management. [Rockville, Md. ?] : U. S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Office of Marine Pollution Assessment ; Seattle, Wash. : Distributed b
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