Host and Habitat Relationships 623 



same general area. All samples from Eniwetok and Rongelap 

 showed greater numbers of Micrococcus and (non-fecal) Entero- 

 bacteriaceae sp. than samples from the northern Pacific Ocean 

 areas. 



Physiological and biochemical activities of the bacterial 

 populations studied showed some differences do exist between 

 populations taken in different geographical areas and from the 

 different phyla of invertebrates and chordates. Organisms isolated 

 from southern areas were preponderantly mesophilic and showed 

 greater proteolytic and reductive activity associated with nitro- 

 gen metabolism. Northern areas of the Pacific Ocean yielded 

 marine animal commensals which were psychrophilic and active 

 in aerobic carbohydrate utilization. A consistently eurythermic 

 portion of the commensal bacteria sampled in all areas was found 

 to be present. Animal host differences were less explicit, but, in 

 general, bacteria from vertebrates were more active biochemi- 

 cally, both in toto and by major groups, than those from inverte- 

 brates. 



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