TEMPERATURE AND THE DISTRIBUTION OF PARTICLES 



Gymnodinium flavum: G. flavumwas present (fig. 23) in 

 relatively even concentration throughout the water column. 

 Temperature (fig. 22) decreased markedly from 15 feet to 

 the bottom, but the thermocline was broad and lacked the 

 discrete thermal barrier present during Operation I. The 

 organism appeared throughout the water mass, either as 

 a function of the absence of a sharp thermal barrier, or 

 as a function of bloom abatement. 



Ceratium fusus: C. fusus (fig. 24) was distributed almost 

 entirely below the 70 °F isotherm which marked the top of 

 the thermocline. The zone of highest population density 

 (0400 21 July at 18 feet) correlated with a vertical oscilla- 

 tion in thermal structure. 



Ceratium furca: The distribution of C. furca (fig. 25) 

 followed the same pattern as that of C. fusus. The bulk of 

 the population was found below the 70 °F isotherm, in water 

 characterized by a constantly decreasing temperature 

 gradient. 



OTHER DINOFLAGELLATES: The several species 

 lumped in figure 26 were largely distributed from 30 feet 

 to the bottom and well below the 70°F isotherm. A popula- 

 tion was present at 0400 21 July at 18 feet which corre- 

 sponded to a vertical oscillation in the thermal structure. 



DIATOMS: Very low concentrations of diatoms 

 (fig. 27) were present and probably represented the frus- 

 tu-les of dead cells. The concentrations showed no consistent 

 relationship to temperature gradients. 



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