708 Mamie Microbiology 



Copepodu ill \ arious seas and oceans and the rate of filtration in 

 Calanipeda is nearly that which has been found in Calanus fin- 

 mar chiciis (3, 5, 8). 



The wealth of microflora in various seas and oceans has been 

 shown at the beginning of this report. The marine plankton is 

 greatly accumulated in zones where the phytoplankton "in full 

 bloom" is fading away, that is, just where the quantity of bacteria 

 begins to increase sharply. The works dedicated to the study of 

 the extremely complicated question of interrelations of phyto- 

 plankton and bacteria testify that the cells of planktonic algae in 

 state of vital activity either are entirely sterile, or suppress, in con- 

 siderable measure, the multiplication of microorganisms. Only 

 the dying, atrophying cells of vegetable plankton stimulate the 

 quick development of bacteria. Probably owing to that very fact, 

 zooplankton accumulates along the borders of the "blooming" 

 phytoplankton, where the decomposition of the latter begins and 

 the nutriment is concentrated in an immense quantity of micro- 

 bial cells, which apart from their being of a considerable nu- 

 trient value, supply a great number of vitamins. 



REFERENCES 



1. Bond, R. M.: A contribution to the study of the natural food-cycle in 



aquatic environments with the particular consideration of microor- 

 ganisms and dissolved organic matter. Bull. Bin^Juim Oceanograph 

 Collect., 4:18-31, 1933. 



2. Clarke, G. L. and Gellis, S. S.: The nutrition of Copepods in rela- 



tion to the food-cycle of the sea. Biol Bull, 68:231-247, 1935. 



3. Fuller, J. L. and Clarke, G. L.: Further experiments on the feeding 



of Calanus finmarchicus. Biol. Bull, 70:308-320, 1936. 



4. Gaevskaja, N. S.: About some new methods in studying the nourish- 



ment of aquatic organisms (Russian). Zool. Magazine, 7 7:1003-1018, 

 1938. 

 .5. Gauld, D. 1.: The grazing rate of planktonic Copepodes. ]. Marine Biol. 

 Assoc., 29:695-714, 1951. 



6. Gauld, D. T.: Diurnal variations in the grazing of planktonic Cope- 



podes. J. Marine Biol. Assoc, 31:461-474, 1953. 



7. Gorbunov, K. v.: Cellulose bacteria as a link in the food chain of 



sweet water reservoirs (Russian). Microbiology, 15:149-153, 1946. 



8. Harvey, H. W.: Note on selective feeding by Calanus. J. Marine Biol. 



Assoc, 22:97-100, 1937. 



