PEARCY: MICRONEKTON AND MACROZOOPLANKTON OFF OREGON 



A SONOIJF MAMJ JASONDIJFMAMJ JAS ONOI 



1962 1963 I lae^ 



JFMAMJJASONOIJFMAHJ JASONDIJFMAMJ J 



1965 1966 I 196/ 



Figure 2. — Biomass of micronekton captured in Isaacks-Kidd mid-water trawl collections at four sta- 

 tions, 1962-1967. Each point represents one collection. Average depth of tows was 40 m for 28-km 

 station, 130 m for 46-km station, and 200 m for 84- and 120-km stations. 



TOTAL 



DISTANCE OFFSHORE (km) 



>I20 



Figure 3. — Inshore-offshore variations in the average total 

 micronekton biomass (grams per 10 m^ ± 1 SE) and in its 

 component fishes, shrimps, and squids. 



ally reversed, downwelling occurs, and the David- 

 son Current is often present along the coast 

 (Wyatt et al. 1972; Bakun 1973). The means and 

 medians of the biomass of total micronekton per 10 

 m^, and of its constituents — fishes, shrimps, and 

 squids — are given in Table 2 for these two sea- 

 sons, along with the probabilities that the two 



e 

 o 



>- 

 <r 

 o 



28 



MAY-OCX. 



46 



84 120 



DISTANCE OFFSHORE (km) 



>I20 



Figure 4. — inshore-offshore variations in the biomass of mi- 

 cronekton during two seasons, May-October and November- 

 April. Shaded areas included means ± 1 SE. 



seasonal values are the same. Seasonal differences 

 of total biomass are significant (P<0.05) at 46 



73 



