Paper 2C 



inated the zooplankton within the eddy but also were more 

 numerous within the eddy than without. ALL other taxa of 

 cLankton were more numerous in SheLf and SLore Water samples than 

 in the eddy sanpLes. The history of this eddy and the 

 distribution and abundance of these copepod species show some 

 interesting relationships. 



Gotthardt (1973) showed that warm core Gulf Stream eddies form 

 from Gulf Stream meanders/' ^hich break off into the Slope water 

 forminc a Gulf Stream Water ring surrounding a Sargasso Sea Water 

 core. * Gulf Stream meander was shown southeast of Georges Bank 

 on the 2b June 1V75 Experimental Ocean Frontal Analysis (EOFA)^ 

 chart. A week later the 3 June chart indicated a feature which 

 was later shewn to be Eddy D. 



Thp Gulf Stream and a small area of the Sargasso Sea east of the 

 Chesapeake biyht were sampled in June 1975. No M. iucens was 

 found/ which is consistent with the findings of other 

 i p ve St igs tor s in this area. It can be assumed that Eddy D formed 

 without i,ny M. lucens. Although F. aracilis was not founo in any 

 summer ti 11.6/ 1C-m CPR samples of the Gulf Stream/ Bowman (1971) 

 found it abundant in all seasons in Gulf Stream samples taken 

 between the surface and 73 m. ^ieuromamma aracilis may have been 

 cresent in the deep water of the eddy. 



The EOFA charts showed Eddy D moving westward from southeast of 

 of Georqes Bank in late June 1973 to the New York Bight area in 

 December 197 5. It appeared from the charts to be entraining 

 Slope and Shelf Waters as it ijent. f^etridia lucens appeared in 

 Chesapeake Bight Shelf Water samples in November and December 

 1975 and Slope i^ater samples in December 1975. Pleuromammg 

 gracilis appeared in both Shell and Slope Waters in November and 

 DeceTLier. It is likely that these two species also occurred in 

 Slope Water in the vicinity of Fddy D. Edcy D may have been 

 colonized by '^i • iU£^CS from the Shelf and Slope Waters which it 

 entrained to the south of New England. 



During J^nuary 1976 every Slope Water sample from the New York 

 Biyht contained P. g.Lacil.is and r^. Ly.£§.QS/ while Shelf Water 

 samples also contained M. iy cens . It can be assumed that Eddy D 

 entrained scne of these as it Toved through the New York Bight 

 Slope water. 



'U.S. Navy Oceanogrspf'ic Office/ Applications Research Division/ 

 SuitUnd/ V.\) Z0374. 



339 



