of the concentration of chlorophyll in the oligotrophic waters could 

 hardly be over 50%, we must assume that Cp^y^ is undervalued by the 

 counting method by a factor of at least 50 in this case. This 

 apparently results from underestimation of amount of Flagellata, 

 Coccoliths and other nanno-forms. These forms, of course, are also lost 

 during collection and treatment of richer samples, but they represent a 

 smaller fraction of the cell counts and biomass of the phytoplankton 

 (Sukhanova, in print; Beers et al., 1975). 



The introduction of corrections yields more realistic but also 

 questionable coefficients (see Table 1). 



Table 1. Relationship between basic characteristics of phytoplankton 

 and its production at the surface. 



Oligotrophic Mesotrophic Eutrophic 

 Item Water Water Water 



NOTE: Numerators show mean values (in parentheses with approximate cor- 

 rections for systematic errors); denominators show limits of variation. 



236 



