136 Marine Microbiology 



TABLE 2 



General Growth Requirements of 1748 Cultures 

 Isolated From Sea Sediments and Waters 



Media Requirements 



II 



III 



Source of 

 Cultures 



I 



Minerals 



and I Plus 



Carbon I Plus Amino 



Source Vitamins Acids 



IV 



II Plus 

 III 



Isolation 

 Medium A 



mins by both autotrophic and heterotrophic marine microorgan- 

 isms. Groups of organisms showing saprophytic and holozoic ten- 

 dencies are known to exhibit pronounced auxotrophic character- 

 istics, and marine bacteria conform to this general rule. The blue- 

 green algae living in marine muds also exhibit marked require- 

 ments for vitamin Bij compounds, as might have been expected 

 in view of their close phylogenetic relationship with bacteria. 

 Recognizing tlie common requirements among planktonic, ben- 

 thic, and littoral marine microorganisms for vitamins of the B 



