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1 CHARLES S. YENTSCH 



2 change as a result of a number of different factors, some 



3 of which are contained in the individual metabolic 



4 processes of the organism, others which result just merely 



5 from a sort of dynamics of the water movement. So to a 

 e stationary observer, their numbers may decrease as the 



7 result, for instance, of grazing planktonic herbivores, 



g they can decrease by the mere fact that they are denser 



9 than the water which surrounds them and they sink out, or 



10 they may change just because the water is sloshing back 



11 and forth in front of the observer as a result of either 



12 tidal or general circulation of the water body. 



13 I emphasize these points because in the 



14 study of the distribution and growth of phytoplankton in 



15 any area, stations have to be laid out so that the quasi- 



16 synoptic picture, physical and chemical parameters, can 



17 be obtained along with the measurements of the biology in 



18 which the investigator is interested. 



19 With regard to the Federal report on the 



20 study of primary production, I really see no sense in 



21 presenting plankton data as an average value for 12 months 



22 for five stations, which appear to me to be poorly located 



23 in terms of the hydrograph and the general geography of 



24 the Everett and Port Gardner area. It is my experience 



25 that the day-to-day changes are so great that averages of 



