SECT. 2] PRODUCTIVITY, DEFINITION AND MEASUREMENT 163 



Odum, H. T., 1957. Tropic structure and productivity of Silver Springs, Florida. Ecol. 



Monog., 27, 55-112. 

 Paasche, E., 1960. Phytoplankton distribution in the Norwegian Sea in June, 1954, 



related to hydrography and compared with primary production data. Fiskeridirektor. 



Skr.Ser. Havunders, 12, 11, 1-77. 

 Riley, G. A., H. Stommel and D. F. B. Bumpus, 1949. Quantitative ecology of the plankton 



of the western North Atlantic. Bull. Bingham Oceanog. Coll., 12, (3), 1-109. 

 Rodhe, W., 1958. The primary production in lakes: some results and restrictions of the 



14 C method. Bapp. Cons^Explor. Mer, 144, 122-128. 

 Rodhe, W., R. A. Vollenweider and A. Nauwerck, 1958. The primary production and 



standing crop of phytoplankton. Perspectives in Marine Biology, Scripps Inst. Oceanog., 



1956, 299. 

 Romose, V., 1940. Okologische Untersuchungen iiber Homalothecium sericeum, seine 



Wachstumsperioden und seine Stoffproduktion. Dansk Bot. Ark., 10, 4, 1-138. 

 Ryther, J. H., 1954. The ratio of photosynthesis to respiration in marine plankton algae 



and its effect upon the measurement of productivity. Deep-Sea Res., 2, 134-139. 

 Ryther, J. H., 1956. Photosynthesis in the ocean as a function of light intensity. Limnol. 



Oceanog., 1, 61-70. 

 Ryther, J. H., 1956a. The measurement of primary production. Limnol. Oceanog., 1, 72-84. 

 Ryther, J. H., 1959. Potential productivity of the sea. Science, 13, 602-608. 

 Ryther, J. H. and C. S. Yentsch, 1957. The estimation of phytoplankton production in 



the ocean from chlorophyll and light data. Limnol. Oceanog., 2, 281-286. 

 Ryther, J. H. and D. W. Menzel, 1959. Light adaptation by marine phytoplankton. 



Limnol. Oceanog., 4, 492-497. 

 Sorokin, J. I., 1958. The results and prospects of using radioactive C 14 for a study of or- 

 ganic matter cycle in water basins. Radioisotopes in scientific research. Proc. 1st 



(UNESCO) Intern. Conf., 4, 633. 

 Sparck, J., 1936. On the relation between metabolism and temperature in some marine 



Lamellibranchs, and its zoogeographical significance. Kgl. Danske Videnskab. 



Selskabs. Biol. Medd., 13, 5. 

 Steele, J. H., 1958. Production studies in the Northern North Sea. Bapp. Cons. Explor. 



Mer, 144, 79-84. 

 Steemann Nielsen, E., 1937. The annual amount of organic matter produced by the 



phytoplankton in the Sound off Helsingor. Medd. Komm. Danm. Fisk. Havund., 



Ser. Plankton, 3, 3, 1-37. 

 Steemann Nielsen, E., 1952. The use of radioactive carbon (C 14 ) for measuring organic 



production in the sea. J. Cons. Explor. Mer, 18, 117-140. 

 Steemann Nielsen, E., 1955. The interaction of photosynthesis and respiration and its 



importance for the determination of C-discrimination in photosynthesis. Physiol. 



Plantarum, 8, 945-953. 

 Steemann Nielsen, E., 1958. Experimental methods for measuring organic production in 



the sea. Bapp. Cons. Explor. Mer, 144, 38-46. 

 Steemann Nielsen, E., 1958a. A survey of recent Danish measurements of the organic 



productivity in the sea. Bapp. Cons. Explor. Mer, 144, 92-95. 

 Steemann Nielsen, E. and E. Aabye Jensen, 1957. Primary oceanic production, the auto- 

 trophic production of organic matter in the oceans. 'Galathea' 1 Bep., 1, 49-120. 

 Steemann Nielsen, E. and V. K. Hansen, 1959. Measurements with carbon-14 technique 



of the respiration rates in natural populations of phytoplankton. Deep-Sea Res., 5, 



222-233. 

 Steemann Nielsen, E. and V. K. Hansen, 1959a. Light adaptation in marine phytoplankton 



populations and its interrelation with temperature. Physiol. Plantarum, 12, 353- 



370. 

 Sverdrup, H. U., 1955. The place of physical oceanography in oceanographic research. 



J. Mar. Res., 14, 287-294. 



