SUBJECT INDEX 



553 



Thymine, 227 



Tides affecting sea-level changes. 486 



Trace metals 



algal growth, favouring, 190 



ecological value of, 208 



heavy metals, 229 

 Trace substances, Bioassay of, 220 

 TRANSIT: see under Gyropendulum 

 Transition zones, 385, 392, 408 



species, 390 ff, 398 

 Transparency of water 



food-chain, effects on, 444 



measurement of organic production from, 

 155 ff 



plant growth affected by, 348 ff 

 Trichodesmium erythreum, 189 

 Tritium 3 H, circulation studies using, 88 

 Trophic levels, 129, 418, 424, 429 

 Tropical sea-level changes, 494 

 Tryptophan, 226 



T-S (temperature-salinity) curves, 390, 392 

 Tuna (see also Skipjack) 



biomass data, 458 ff 



yellowfin, 477 

 Turbidity, 350 

 Turbonilla, 418 

 Turbulence, 354 

 Turner Fluorimeter, 119 

 Twilight zone, 497 



Ulva lactuca, 197 ff, 377 

 Upwelling, 65 ff , 248 ff, 369 



coastal, 264, 266 ff, 369 



rich water from intermediate depths, 

 353 ff 



variations reported, 270 ff 

 Uracil, 227 

 Uranium, 14 ff, 19 



fission products activities, 79 



radionuclide series beginning 238 U, 21 



Vapor pressure 



chlorinity, relation to, 1 1 1 



over ocean surfaces, 8 

 Venezuela, Gulf of, 60 



upwelling, 65 

 Vertical exchange, 50 ff 



depth and season, function of, 55 ff 



seasonal variation, 53 ff 

 Vitamin B12 (cyanocobalamin) 



assay organisms and response patterns, 

 224 



bioassays, 195, 221 



cycle in sea -water, 204 



Vitamin B12 — continued 



discontinuous distribution, 224 

 ecological significance, 204 ff 

 marine algae, requirement in, 179 

 naturally occurring, properties of, 222 

 sea-water, quantities of B^-hke cobala- 



mins in, 206 ff 

 seaweeds, contained in, 181, 184 ff 

 specificity towards, 197 



Vitamins 



algae constituents, 182 

 algae requirements, 196 

 exchange between bacteria, 181 



Volterra's equations, 438, 442, 454 



Wadden Sea, organic matter dissolved in, 



162 

 Walvis Bay, anaerobic and "azoic" condi- 

 tions, 264 

 Water bath with rotating wheel, 143 ff 

 Water humus, 173 

 Water-masses, 381 



analysis, 235 



and biological species, 383 ff , 403 ff 



boundaries, 397 

 Water sampling and thermometers, 124 



bottles, 124 ff 



dark bottles, 146 



importance of weight of bottle, 125 

 Water tagging and tracer techniques, 118 

 Water vapors : see also Vapor pressure 

 Waves, problems of mooring among, 519 

 Weather, primary production, influence on, 



159 ff 

 Weddell Sea, 285 ff 



highly saline water, 287 

 VVenner Bridge, 113 ff 

 Wesslingsee (Lake), chlorophyll, vertical 



distribution, 131 

 West African coast, upwelling, 66 

 West Australia, variations of upwelling, 



272 

 Western Atlantic Ocean 



N, O and P correlations, 31 



180/160 ratio variations, 23 

 Western Pacific Ocean, compensation 



depth, 349 

 West Wind Drift, 397 

 Whale food, 291 

 William Scoresby cruise, 253 

 Windscale Works of U.K.A.E.A., discharge 



of radioactivity, 85 

 Wind stress, 237 ff 

 Winkler titrations, 119 ff, 139 



