548 



SUBJECT INDEX 



Norwegian Sea 



Lofoten cod fishery, 479 

 organic matter dissolved in, 172 

 primary production measurements, 158, 

 365 

 Norwegia (ship), 286 

 Nuclear tests causing artificial radioactivity, 



78 

 Nutrients 



availability critically limiting organic 



production, 351 ft* 

 availability of elements in sea-water, 39 

 deficiencies affecting composition of 



algae, 28 

 in positive estuaries, 374 

 limiting factors of availability, 39 

 potential fertility, 40 

 preformed and of oxidative origin, 33 ff 

 regeneration, 35 ff 

 traps, 374 

 Nutrient salts, measurement of primary 



production of, 138 ff 

 Nutritional studies, methodology and prin- 

 ciples, 169 



Ob (ship), 287 



Ocean-atmosphere CO2 exchange rates, 



95 ff 

 Oceanic equatorial fronts, 249 ff 

 Oceanic Polar Front, 283 

 Ocean mixing 



large scale: see Radioisotopes and 



models, 88, 96 ff, 100 ff 



non-steady-state conditions, 105 ff 



steady-state system, 90 

 Oceanographical miscellanea (V), 485 

 Oceans as a chemical system, The, 3 (see 



also under Sea -water) 

 Oceans, Fertility of the, 129 ff 

 Ocean water movements : see also Equatorial 

 current systems 



artificial radioactivity as tracer, 83 ff 



two-layer ocean, the thermocline, 239 

 Ochromonas malhamensis, 193 



assay, 195 

 Okhatsk, Sea of, productivity, 364 

 Okichobee, Lake, 168 

 Oolites, 19 



Optical horizon, distance to the, 339 ff 

 Organic regulation of phytoplankton fer- 

 tility, 165 



addendum, 210 ff 



chemical approach, 168 ff 



Organic substances 



bioassay technique, 221 



chemical approach, 168 ff 



decomposition with and without oxygen, 

 46 



dissolved, nature of, 174 



origin and fate of, 167 ff 



production in the sea, 276 ff 



quantities in the seas, 171 ff 



standing crop related to various factors, 

 352 

 Organisms, Influence of, on the composition 



of sea-water, 26 

 Organisms: see Communities of organisms 

 Oshoru Maru mother-ship for Kuroshio, 499 

 Osmotic pressure, chlorinity, relation to, 



111 

 Oxidation 



nutrients of oxidative origin, 33 ff 



of organic matter, 28, 43 



oxidative ratio, 32 

 Oxygen 



anoxic conditions, 42 



availability, 41 ff 



change rates, 88 



dissolved, measurement of, 119 ff 



eastern boundary currents, 263 ff 



excess available in deep waters, 42 



minimum, 241 ff 



production of, used to measure organic 

 production, 139 



saturation value, availability and utiliza- 

 tion in sea-water, 39 



sea-surface exchange, 53 ff 



surface-water experiments, 141 

 Oyashio Current 



cold water, 386 



productivity, 364 

 Oysters' filtering rate, carbohydrates affect- 

 ing, 228 



Pacific Ocean (see also North Pacific and 

 Sovith Pacific) 



barium concentration, 20 



coastal undercurrents, 258 



deep water mainly absent, 74 



ecological zones: subarctic, central, equa- 

 torial, 385 



equatorial currents, 237 ff, 238, 240 



halibut fisheries, 476 



high salinity tongue, 249, 284 



ionium-thorium ratios, 1 1 



North Equatorial Countercurrent, seas- 

 onal variations, 247 



