FISHERY BULLETIN: VOL. 69, NO. 4 



Figure 3. — Temporal variations in the ratio of phaeo- 

 pigments-to-chlorophyll-a (P/C) integrated over the up- 

 per 100 m at CalCOFI 3. 



A s o N D J r 



SURFACE PRIMARY PRODUCTIVITY 

 AND STANDING CROP 



Seasonal variations in surface productivity 

 and standing crop are shown in Figure 4. Since 

 a significant difference (F-test, P<0.01) w^as 

 not observed between morning and afternoon 

 values (see Malone, in press b), only data col- 

 lected during the morning sampling will be con- 

 sidered. 



Phytoplankton productivity and standing 

 crop remained below 5.0 mgC m"^ hr~S 1.00 

 mgChl-a m~^, and 3.5 X 10^ cells/liter during 

 the Oceanic Period. Values above 10.0, 1.50, 

 and 10.0 x 10° were observed only during the 

 Upwelling Period and the January Upwelling 

 pulse. The Mixed Period was characterized by 

 intermediate levels of productivity and standing 

 "■crop. Three peaks were observed, of which the 

 two greatest coincided with the two most intense 

 upwelling pulses: (1) 50.4 mgC m"^ hr~', 7.92 

 mgChl-a m"^ and 24.2 x lO'* cells/liter on the 

 last day of March, and (2) 43.4, 10.46, and 23.9 

 X 10'^ during the last week of January. The 

 third, less pronounced peak, was in mid-June 

 ^during steady upwelling. 



Figure 4. — a. Temporal variations in surface netplank- 

 ton (  ) and nannoplankton ( □ ) productivity (mgC 

 m-3 hr-i) and the net/nanno ratio (O) at CalCOFI 3. 

 b. Temporal variations in surface chlorophyll-a (mg 

 m^') and the net/nanno ratio, c. Temporal variations 

 in surface cell numbers, the net/nanno ratio, and the 

 ratio of dinoflagellates-to-diatoms ( A ) . 



804 



