308 



Fishery Bulletin 94(2). 1996 



the larvae grow, they are carried offshore within the 

 surface layers toward a convergence or frontal zone 

 but eventually return to shore at depth by means of 

 onshore flows. A cell of circulation of this kind con- 

 forms with the observations of a negative wind stress 

 "curl" or Ekman convergence near the coast between 

 Point Baja and Point Eugenia (Bakun and Nelson, 

 1977). Evidence for offshore flow in the surface, and 

 onshore flow at 57 m. was found by Walsh et al. ( 1977 ) 

 in the adjacent coastal shelf of Point San Hipolito 

 (27°N). Similar conditions, within 28 km from the 

 coast for early larval stages I nauplii and calyptopes) 

 of N. capensis, and within 65 km for furcilias, were 

 observed in Mowe Point ( Benguela ) ( Barange and Pil- 

 lar. 1992). These authors proposed a two-cell cross-shelf 



circulation to explain the maintenance of N, capensis 

 near the coast. 



From the same set of samples used in the present 

 study, and from in situ observations in the Santa 

 Barbara Basin (33"N), dense aggregations of stage- V 

 copepodites of Calanus paciftcus californicus were 

 found (Alldredge et al., 1984). The presence of great 

 abundances of resting copepodites of this species had 

 been previously recorded along southern Baja Cali- 

 fornia in oxygen-deficient water (Longhurst, 19671. 

 Off Point Eugenia the species occupied a stratum 

 near 300 m in offshore stations ( 120.60 and 120.50) 

 but was found at 0-75 m in the nearshore station 

 120.45, both day and night. These differences were 

 explained as population diapauses, at depth during 



