Table 5. — Surface vahies of chlnrnpbyll a (mg./m.^), 1952-66, and primarrj production (G.C/m.-lday), 196S-66, for areas 



of Tampa Bay, Fla.' — Continued 



Area 



1952-53 



19S8 



1962 



1905 



Clilor. Pri- Chlor. Pri- Chlor, Pri- Clilor. Pri- Clilor. 



a maiy a niary a iiiary a mary a 



prod. prod. prod. prod. 



Pri- Chlor. Pri- 

 mary a mary 

 prod. prod. 



5.1 

 3.4 



Area V— Boca Ciega Bay: 



January. _ - 



February. _ 



March.. 



April 



May... 



June 



July.-. 



August 8.7 



September 9-0 



October... 8.8 



November 3.1 9.2 



December 7.4 



3.5 



.71 

 .51 

 .44 

 .44 

 .47 

 .40 

 .32 



6.2 

 3.8 

 5.0 

 6.5 

 7.6 

 6.2 

 10.0 

 5.0 

 6.7 

 9.5 



Yearly mean.. 



3.S 



3.6 



.30 11. 1 .47 



.27 7.4 .32 , 



.30 7.9 .41 



.28 4.5 .30 



.34 3.4 .22 



.37 3.9 .25 



.43 



.36 . 



.46 5.1 .26 



.27 10.1 .41 



.31 9.0 .41 



.40 15.0 .59 



.34 6.4 .33 9.8 .42 9.7 



1 Marshall, 1956; Pomeroy, 1960; May and Johnson, unpublished data, on 

 (lie at Bureau of Commercial Fisheries Biological Laboratory, St. Petersburg 



Beach, Fla.; Saloman et al., 1964; Flnucane and Dragovich, 1966; Dragovich 

 et al., 1966; Saloman and Taylor. 1968. 



Compiired witli average concentrations of phos- 

 phorus and nitrogen in surface sea water, Boca 

 Ciega Bay lias about five times more pliosphorus 

 and four times as much nitrogen (Sverdrup, John- 



son, and F eming, 1!)4'2; Armsti-ong, 1965; Vac- 

 caro, 1965). Even wlien compared with other estu- 

 arine systems of the Atlantic and Gulf Coasts, 

 Boca Ciega Bay and the other areas of Tampa 

 Bay rank high in these elements (Newcombe and 

 Brust, 1940; Williams, 1954; Eiley and Conover, 

 1956; NcNulty, Reynolds, and Miller, 1959; 

 Lackey, 1963; Mackenthun, 1965; Saville, 1966). 

 Under natural conditions, phosphorus and ni- 

 trogen enter Tampa Bay mainly through discharge 

 from rivers and springs (Dragovich and May, 

 1962; Dragovich, Kelly, and Goodell, 1968). The 

 major contribution of phosphorus enters Hills- 

 borough Bay through the Alafia River from 

 mining operations in extensive phosphatic deposits 

 east of Tampa. On the basis of water analyses made 

 in the early 1950"s phosphorus in Hillsborough 



T.\BLB 6. — Mean total phosphorus from surface and bottom 

 water of undredged and dredged sampling stations in Boca 

 Ciega Bay, Fla., 1963-64 



Figure 12. — Bottom sampler of stainless steel (0.2.5 m.° 

 used for sampling vegetation and infauna. 



EP'FECTS OF HYDRAULIC DREDGING AND CO.\STAL DEVELOPMENT IX BOCA CIEGA BAY, FLA. 



231 



