BIGELOW: EXPLORATIONS OF THE COAST WATERS. 



313 



Some information as to the seasonal fluctuations in the amount of 

 plankton present in the Gulf is afforded by the work done in 1915. 

 In May of that year the volume of plankton, both per square meter 

 (Fig. 93) and per cubic meter, was greatest in the east and west sides 

 of the Gulf. But though the rich area extended right across the Gulf 



Fig. 93. — Plankton per square meter of sea area. May 1915. 

 5, very rich 300 + cc. 



4, rich 100 + cc. 



3, intermediate 30— 100 cc. 

 1, scanty 30 — cc. 



it* was indented on the north by less prolific water; and the zone 

 along the northern coast, /. e., just where the diatom swarm was at its 

 maximum, was very barren of large organisms, as illustrated by the 

 following table of volumes per square, and per cubic meter for that 

 year. These, however, are not directly comparable with the data 

 for 1914, since a different netiwas used. 



' Its continuity depends on the richness of the horizontal surface haul at Station 10268. 



