PRIMARY PRODUCTION •— • CHL o STANDING CROP "" 

 SOLAR RADIATION d3 TEMPERATURE t£3 RIVER FLOW c£3 



100 -i 



"1I9.0°C 



2 52 m 3 s"' 



NARRAGANSETT BAY, R.I. 

 " °-l 280°C 



PATUXENT RIVER, MD 

 280°C 



t — i — i — i — i — i — i — i — i — n - 

 COR E SOU N D , N.C. 



" :«JlK"'' 



-r~i — i — r~i — i — i — i — i — i — i~i -t~i — mi — n — i i i — i i i " ^ l"f "i ' i "i "i i — i — i — r ■ 'f ' T ' 



U. NEAR-SHORE GEORGIA BIGHT 



" 100 -i 



28.7°C 



I I I I t T 'I'T' I 'T'I 



BARATARIA BAY, LA 

 9.3°C 



J' M' M J' 

 COLUMBIA RIVER MOUTH 



Figure 8. Comparison of the relative seasonal distribution of solar radia- 

 tion, water temperature, freshwater input, phytoplankton primary production 

 and phytoplankton chlorophyll a (CHL a) in six estuarine and nearshore en- 

 vironments over an annual cycle. Maximum values from which the normalized 

 distributions were calculated are also shown for comparison. Data from 

 sources in text (especially Table 2 and Figures 1 and 2) except as follows: 

 Solar radiation, five-year mean from Climatological Data, National Summary 

 (U.S. Dept. of Comm. , Ashville, N.C); Narragansett Bay plankton data from 

 Durbin et al. (1975); Georgia Bight plankton from Haines and Dunstan (1975). 



48 



