10' 



10^- 



10^- 



2 



Studies on the Ecology of a Marine Spirillum 



2,8 mg asp-N/L 



561 



12 

 Hours 



24 



36 



4d 



60 



Fig. 1. Readjustment of steady state of the population of Spirillum sp. in 



the chemostat at three different concentrations of growth limiting substrate 



(given as mg. asparagine-N/L) and final washout at a constant dilution 



rate of 0.185 hi-^ (broken line). 



of steady states at higher substrate concentrations indicated no 

 perceptible change of the growtli rate. At an Sr of 0.28 mg 

 asparagine-N/L, however, initially the cell coinit fell almost as 

 fast as the dilution rate. The growtli rate apparently did not re- 

 cover until the cell count had fallen below the value which 



