20- 



15- 



10- 



5- 



0- 

 25 



o 20H 

 d> 



d. 



Q. 15- 



O 



Q. 



10- 



5- 

 0- 

 20- 



I5H 



10- 



5- 



HTDROLOGICAL CHARACTERISTICS 

 HILLSBOROUGH RIVER STA. 29 



o° 

 o 





n ] ] \ \ 



LITTLE MANATEE RIVER STA. 33 



o 





s 



o • • 



1 I 1 1 1 1 



MANATEE RIVER STA. 36 • 



o 



• • • o 





0^ 



5 



10 15 20 25 



SALINITY %o 



OF TAMPA BAY TRIBUTARIES 

 ALAFIA RIVER STA. 31 



173 



» 



• • to 



o 



*«?• 



SURFACE---* 

 BOTTOM O 



r 65 



-60 



-55 



-50 



-45 



-40 



o 



H35  

 o> 



Q. 



30 * 

 o 

 a 



-25 



20 



15 



-10 



- 5 



1 I I I r 



5 10 15 20 25 



SALINITY Voo 



FiGUBE 7. — Phosphorus-salinity relation of Tampa Bay tributaries, October 1958-December 1959. 



comparable to the mean value (4.7 /xg.at./].) for 

 the Peace River and higher than that for the Ca- 

 loosahatchee River (2.2 jug.at./l.) (Finucane and 

 Dragovich, 1959). The Little Manatee and Man- 

 atee Rivers were even poorer than the Caloosa- 

 hatche© River in nitrate-nitrite nitrogen. Xone 

 of these Florida rivers approach the Mississippi 



River level (14.6 ;ng.at./l.) for this nutrient 

 (Riley, 1937). 



The present data for the rivers, together with 

 parallel observations in Tampa Bay (Dragovich 

 and othei-s, 1961), sugge.st that the rivers do not 

 enrich the waters of Tampa Bay to an appreciable 

 degree with nitrate-nitrite nitrogen. Dragovich 



