LOUGH: LARVAL DYNAMICS OF DUNGENESS CRAB 



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25 



20 



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< 



IT 

 Ld 



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2 10 



5 • 



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20 25 30 



SALINITY (%.) 



15 20 25 30 



SALIN I TY (%o) 



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40 



UJ 

 (£ 



I- 

 < 



UJ 



a. 



S 



UJ 



10 



10 



15 



20 25 30 



SALINITY (%o) 



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20 25 30 



SALINITY (%o) 



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Figure 4. — Response surface estimation of percent survival oiCancer magister larvae after (A) 20 days, (B) 30 days, (C) 40 days, and 

 (D) 50 days of development at 20 different temperature and salinity combinations. 



periods explained a significant 77-87% of the var- 

 iance in the data. The lowest surface temperature 

 and salinity reported for any sampled station dur- 

 ing the 1971 season was 7.4°C and 25.17%. After 

 20 days at this combination, 76.8% survival is 

 predicted; after 50 days, 44.6% survival. The 

 monthly mean surface temperature and salinity 

 compiled at the Oregon State University Marine 



Science Center dock, Newport, is reported by 

 Wyatt and Gilbert (1972) for March 1971 to be 

 8.81°C and 30.12'L. Survival of 92.3% is predicted 

 at this temperature and salinity combination 

 after 20 days, and 71.0% survival after 50 days. 

 The direct effect of these temperatures and 

 salinities found off the central Oregon coast on 

 the survival of C. magister larvae would appear to 



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