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... suggest, five main questions that students of marine primary productivity need to ask themselves about any... and how effective is their utilization in the overall marine food cycle? The significance of any value
... of concentrations of food stuff in the water. At lesser concentrations the organism does too much work in feeding... and these bacteria form the food for lamellibranchs ingesting the cellulose fragments. A plant cell can be digested...; Cerruti, 1941; Coe, 1945 and 1948). A long list of the ultra-plankters thought to have food value is given... of algae from ten genera. Again differences in food value could be detected. Isochrysis galbana... nor the shape of the food was a factor in this selection which was attributed to the presence
... of this interest one must go back to the early diagrammatic food webs of Shelford (1913), Naumann (1925), Perfiliev... of the various food levels. This conceptual development probably gained much from the earlier recognition... served to focus attention on the autotrophic organisms which are the first to utilize energy in the food... important primary producers and serve as the major food source for the zooplankton. The development
... utilization of this carbon by micro-heterotrophs opens up a pathway for its re-entry into the food chain which... in the marine food chain. Nethertheless I am convinced that a more detailed and quantitative study... of us concerned with primary production is to see that we can describe the amount, nature, size and food... idea of the food potential of these important manifestations of organic production than we at present
... intensities. SIGNIFICANCE OF PRIMARY PRODUCTION IN THE MARINE FOOD CHAIN We come now to what is probably..., are the plant cells being utilized in the food chain? To quote from Marshall and Orr (1958a) "Little is known... colleagues who are concerned with higher links in the food chain. However, with a few notable exceptions, I... a few of the results obtained in my own laboratory. For the correct assessment of the food value of any
..." of plants in March, the proteinaceous detritus at the coast largely disappears). (b) Phytoplankton as food... on the whole marine food cycle of this planet as the effect is found in many parts of the world. We are clearly... need to be much better known. Turning now to the food value of phytoplankton for zooplankters, one can... spores) they are not ingested at all. They may have potential food value if first eaten by phagotrophic
... to be good food for Calanus finmarchicus although some were better than others. The two dinoflagellate... of both plant and animal can the true food value of a phytoplankter for a given zooplankter be correctly... showed that there were very real differences in food value between various species of phytoplankton... satisfactory. (c) Phytoplankters, as food for lamellibranchs A certain amount of work has been done
... blooms of phytoplankton may be useless as a source of food for zooplankters unless an adequate mixture...), that dissolved organic matter in sea water acts as a direct food stuff for animals, has been the subject of much... of direct absorption of organic substances. Undoubtedly Putter was correct in his appreciation of the food
... is evidenced by Holmes (1958b). Inhibition of photosynthesis by contact with metals appears to be the rule
...: 29-57. Loosanoff, V. L. 1949. On the food selectivity of oysters. Science 110: 122. Lovern, J. A. 1936... 23(2): 173-177. Marshall, S. M. 1924. The food of Calanus finmarchicus during 1923. Jour. Mar. Biol
.... Growth factors as supplements to inadequate algal food for Tigriopus japonicus. Preprint Int. Oceanogr... algal food for Tigriopus japonicus. Tohoku Jour. Agricult. Res. 10: 89-96. 205
... and Xanthophyceae. Finally, we should mention the possible food value of detritus, which is an important constituent...). It is inconceivable that such material does not have some food significance to pelagic organisms and evidence
... to predominate. Investigation of the nannoplankton thus appears to be the most urgent problem facing students
... of Food and Agriculture Krishi Bhavan New Delhi 1, India Papenfuss, Prof. George F. Dept. of Botany
.... Juday (1940) calculated the annual production and energy utilization at each stage of the food chain
... the possible importance of symbiotic algae in the food relations of reef organisms. Sargent and Austin (1949
.... Jour. Mar. Res. 17: 312-324. Krogh, A. 1931. Dissolved substances as food for aquatic organisms. Biol
... of primary production in the marine food chain . . . . . 177 Conclusions . . . . . .
.... Planta 51: 49-62. Fish, G. R. 1955a. The food of Tilapia in East Africa. The Uganda Journal 19: 85-89
... favorable for herbivorous zooplankton because of the higher concentration of food per unit volume. 4
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