o 

 o 





< 



< 



Z> 



< 



UJ 



10 15 20 



MEAN ANNUAL TEMPERATURE, °C 



25 



Figure 4. Mean annual surface water salinity and temperature at 46 estua- 

 rine and nearshore sampling stations reported by the U.S. Department of 

 Commerce (1960). The length of record varies. 



39 



