TABLES 



1 Microentities related to turbidity. Operation I, . . page 15 



2 Microentities related to turbidity, Operation II. . . 16 



ILLUSTRATIONS 



1 Site of the NEL oceanographic research tower. . . page 4 



2 Equipment rack on NEL tower. . . 5 



3 Vertical series of filtered material. . . 8 



4 Microscope and plastic trough used in macroplankton 



counts. . . 9 



5 Manifold used in Millipore filtration to prepare slides of 



microorganisms. . . 11 



6 Counting technique used for micro plankton. . . 13 



7 Typical planktonic organisms. . . 17 



8 Least- squares lines illustrating the relationship between 



light attenuation and number of microentities. . . 19,20 



9 Theoretical relationship between light attenuation and 



number of microentities. . . 25 



10 Water transparency. Operation I. . . S6 



11 Water temperature. Operation I. . . 27 



12 Distribution of Gymnodinium flavum, with transparency data 



in red. Operation 1. . . 29 



13 Distribution of Ceratium fusus, with transparency data 



in red, Operation I. . . 30 



14 Distribution of Ceratium furca, with transparency data 



in red. Operation 1. . . 31 



15 Distribution of other dinoflagellates, with transparency 



data in red. Operation I. . . 32 



16 Distribution of miscellaneous diatoms, with transparency 



data in red. Operation I. . . 33 



17 Distribution of total microorganisms, with transparency 



data in red. Operation 1. . . 34 



18 Distribution of total inanimate material, with transparency 



data in red. Operation I. . . 35 



