MICROCONSTITUENTS 



MICROORGANISMS 



Five categories of microorganisms (tables 1 and 2) 

 were counted. The sum of the five concentrations is tabu- 

 lated under "Total microorganisms. " For each entry in 

 each operation a time-depth plot of population density was 

 prepared. 



Three species of dinoflagellates were prevalent, 

 with Gymnodinium flavum dominant during both operations. This 

 organism is essentially a sphere averaging 28,8 microns 

 in diameter after fixation. Two species of Ceratium, tentatively 

 identified as C. furca and C. fusus, were common. C furca averaged 

 123. microns in length by 53. 1 microns in width, and C. fusus 

 averaged 188, microns in length by 29. 5 microns in width. 



The heading "Other dinoflagellates" combines in one 

 category dinoflagellates not numerous enough to consider 

 individually. The cells are generally spherical and vary 

 between 15 and 40 microns in diameter. 



Several species of diatoms were in evidence; individ- 

 ually never in high concentration, they are lumped for 

 treatment. 



INANIMATE PARTICLES 



Nonliving particles over 10 microns are grouped in 

 several categories. Fibrous material is tabulated under 

 "Wood fibers, " Fecal-like particles appear under "Organic 

 aggregates, " and other detritus is summarized under 

 "Unidentified particles. " The sum of "Total microorganisms" 

 and "Total inanimate material" makes up "Total micro- 

 constituents. " 



