SECT. 2] 



OKGANIC REGULATION OF PHYTOPLANKTON FERTILITY 



207 



XIT 



Cobalamins Found in Sea-Water 



Quantity or range 



Remarks 



Authors 



30-200 mug/1. 



10 mjjtg/1. 



5-10 m(ig/l. 



6 m{ig/l. 

 4 m[xg/l. 

 0.1 mfig/1. (Aug)-1.2 mfig/1. (Oct.) 



0.4 mjig/1. (Apr.)-2 m^g/1. (Feb.) 

 0. 5 m(xg/l. (Aug.)-2 mjj.g/1. (Apr.) 



2.26 m[i.g/l. (mean of 34 samples) 

 0.57 m[i.g/l. (mean of 7 samples) 



0.3-1.5 m(j.g/l. (range of 90% samples ; 



min. = 0.0 ; max. = 20 mjjLg/l.) 

 0.5-2.5 mfi.g/1. (range 80% samples) 

 7-26 m[ig/l. (max. 20% samples) 



3.2 mjj.g/1. (aver. 34 samples; 



6 samples 0.0) 



5.3 m(i.g/l. (aver. 57 samples; 



7 samples 0.0) 



6.7 m[i.g/l. (aver. 44 samples; 



2 samples 0.0) 

 3.0-3.5 mpig/1. (inside Bay) 

 1.3 ni(xg/l. (outside Bay) 

 4.5-11.4 mjjLg/1. (after spring diatom 



bloom) 

 12-14.6 mfj.g/1. (winter) 



Variations due to length 

 of aging in laboratory 



Same sample assayed with 

 2 bioassay organisms 



Pronounced seasonal 

 variations 



190-2190 m depth 



< 190 m and >2110 m 



depth 

 Surface (0-100 m) 



Below 200 m 



Mouth of Bay 



Middle of Bay 



Deep inland part of Bay 



Bahia Fosforescente, 



Puerto Rico 

 Pronounced seasonal 



variation 



Provasoli and Pintner 



(1953a) 

 Lewin, R. A. (1954) 



Droop (1955) 



Cowey (1956) 



Cowey (1956) 



Cowey (1956) 

 Cowey (1956) 



Daisley and Fisher (1958) 

 Kashiwada et al. (1957) 



Kashiwada et al. (1957a) 



Burkholder & Burk- 

 holder (1958) 

 Vishniac and Riley 

 (1959, 1961) 



/The values obtained with the two assay organisms are similar, i.e. true B12 may be the 

 major cobalamin (80-90%) in these waters. 



9 Responds to true B12, pseudo-Bi2, all factors including factor B and to methionine. 

 * Responds only to true B12. 



