FISHERY BULLETIN: VOL. 74, NO. 2 



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1969 1970 197: 

 CflNCER MflGISTER flT NH03 



FIGURE 3.— Density of Cancer magister larvae at stations NHOl, NH03, NH05, and NHIO from June 1969 through August 1971, 



collected with the 0.2-m bongo net sampler, 0.57 1-mm mesh. 



Salinity values show^ed considerable variability 

 among stations and months such that a 

 generalized trend could not be observed between 

 the two seasons. The anomalous winter of 1971 

 was further substantiated by Bakun's (1973) in- 

 dices of coastal upwelling intensity for selected 

 locations along the west coast of North America 

 based on offshore Ekman surface wind transport 

 from monthly mean surface atmospheric pressure 

 data. Positive values indicate periods of coastal 

 upwelling whereas negative values indicate 

 downwelling. January and February of 1970 at 

 lat. 45°N, long. 125°W show significantly greater 

 negative indices (-98 and -71, respectively) 

 than the same period in 1971 (-32 and -16, re- 

 spectively). High negative values are indicative 

 of strong downwelling along the coast which 



358 



Bakun stated would accelerate the southward 

 flow. In either case, more offshore surface water 

 would be transported onshore. During the March 

 transition period, the 1970 index was normal 

 ( + 1); however during 1971 an anomalously high 

 negative index (-49) occurred. This indicates 

 that downwelling and subsequent transport of 

 surface waters was more intense during March of 

 1971 than 1970. Downwelling also was more in- 

 tense during March 1971 than in the previous 2 

 mo of that year. Drift bottle data compiled by 

 Wyatt et al. (1971) reported a 14.7% return for 

 bottles released off Nevi^jort from 25 February to 

 3 March 1970. By contrast, a 28.6% return oc- 

 curred during 6-9 March 1971. The average per- 

 cent return of drift bottles on all stations west of 

 Newport, 1961-71, during both February and 



