NOAA PROFESSIONAL PAPER 11 



MEAN 

 MAY 



DISCHARGE 

 1946- 1976 



MEAN JUNE DISCHARGE 1946-1976 



3 5 7 9 



13 15 17 19 21 23 25 27 29 31 I 

 MAY »H- 



3 5 7 9 II 13 15 17 19 21 23 26 27 29 

 JUNE *\ 



FIGURE 9.1-18— Freshwater flow of the Hudson River at Green Island during May and June 1476. (C. A. Parker— from U.S.G.S. data.) 



the rapid turnover of POC calculated for the Apex in the 

 absence of C. tripos. In effect, the C. tripos bloom pro- 

 vided a mechanism by which large quantities of POC were 

 accumulated over several months. The change in the rel- 

 ative abundance of phytoplankton species and the effects 

 of this change on the distribution and quantity of POC in 

 the subthermocline water column resulted in exceptionally 

 high BOD in 1976. Unfortunately, we do not understand 

 this type of species succession very well, and the basic 

 question of why the C. tripos bloom occurred in the first 

 place remains unanswered. 



ACKNOWLEDGMENTS 



The following individuals contributed data on Ceratium 

 tripos abundance: Mark Brown (Louis Calder Conserva- 

 tion and Ecology Studies Center), Myra Cohn (NMFS, 

 Sandy Hook Laboratory), Michael Dagg (Brookhaven 

 National Laboratory), John Mahoney (NMFS, Sandy 

 Hook Laboratory), Paul Olsen (New Jersey Department 

 of Environmental Protection), Sylvia Weaver (New York 

 University), and Joseph Vaughan (New Jersey Depart- 

 ment of Environmental Protection). 



The following also gave assistance and advice: Mira 

 Chervin (Lamont-Doherty Geological Observatory), Chris 

 Garside (Bigelow Laboratory for Ocean Sciences), Steven 

 Howe (Brookhaven National Laboratory), Joel O'Connor 

 (NOAA/MESA New York Bight Project), Jay O'Reilly 



(NMFS, Sandy Hook Laboratory), and James Thomas 

 (NMFS, Sandy Hook Laboratory). 



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216 



