Table l.-A list of sampling dates and total zooplankton catch 

 (individuals/m') at stations NH 1, 3, 5, and 10. These stations are 

 approximately 2, 5, 9, and 18 km from shore. 



Date 



NH 1 



NH3 



NHS 



NH 10 



a seasonal pattern in total zooplankton abundance. 

 Low abundances always occur in April, May, and 

 early June. Low abundances occur at various times 

 during summer and fall as well. Peak abundances 

 occurred in late June and July during 1969 and 

 1970. No such peak developed in 1971. As a result, 

 standing stocks in 1971 were much lower than 

 other years. There is some indication that 1972 

 may have had low standing stocks as well. 



Table 2 shows the average catch at each station 

 for three seasons. The 1969 data are biased since 

 there are no samples for spring months. To make 

 the average catch data comparable, samples 

 averaged for 1970 began with 23 June and for 1971 

 began with 12 June. As with temperature-salinity 

 and wind data, 1971 is markedly different from 

 1969 and 1970, particularly close to shore. This 

 inference was tested by the Kruskal-Wallis sum of 



Table 2.-Average catch of zooplankton at stations NH 1, 3, 5, 

 and 10 for each upwelling season. Not all sampling dates are 

 included in the mean because the 1969 data are biased since the 

 first samples were collected on 22 June. Therefore, to make all 

 data sets comparable, only samples taken from 23 June through 

 September 1970 and 12 June through September 1971 were used. 



Year 



NH 1 



NH3 



NH5 



NH 10 



1969 

 1970 

 1971 



16,344 



16,196 



5,012 



7,379 

 4,618 

 1,433 



4,090 

 2,300 

 1,233 



1,528 

 1,828 

 1,086 



ranks test. Medians for the 3 yr were found to be 

 significantly (P<0.05) nonhomogeneous at all of 

 the stations except NH 10. 



Zooplankton Species 



Copepods are the dominant zooplankters in our 

 samples. In 100 of 137 samples collected 1969-72, 

 they account for more than 90% of the total catch. 

 In the remaining samples they made up at least 

 50%. Several species of copepods were individually 

 dominant or shared dominance: Calanus 

 marshallae Frost (1974), Pseudocalanus sp., Cen- 

 tropages abdominalis Sato {= C. mcmurrichi 

 Willey), Acartia clausii Giesbrecht, A. longiremis 

 Lilljeborg, and Oithona similis Glaus. These 

 copepods are responsible for the patterns of 

 seasonal and spatial abundance seen in Table 1. 

 Individual species patterns are illustrated in 

 Figures 4 and 5. Pseudocalanus sp., A. clausii, and 

 C. abdominalis are grouped in Figure 4 because 

 they are most abundant at the station nearest the 

 beach. Figure 5 contains A. longiremis and 

 Calanus sp. because they are usually more abun- 

 dant farther offshore. Oithona similis abundance 

 has no certain relationship to distance offshore 

 within 18 km of the coast. Other species exhibit 

 similar abundance gradients but they will not be 

 discussed in this paper. 



Table 3 lists relative density and frequency of 

 occurrence of all copepod species. Relative density 

 is the average number of individuals in samples in 

 which the species occurred. The values in the table 

 are sums of relative densities at the four stations 

 for individual years. Table 4 lists relative density 

 and frequency of occurrence of other holoplank- 

 tonic taxa and of the meroplankton. The taxa that 

 occurred most frequently or were abundant 

 include chaetognaths {Sagitta elegans Verrill 

 predominantly), bivalve veligers, barnacle nauplii, 

 euphausiid eggs, and small round eggs which are 

 probably Calanus eggs. 



647 



