POWER and McCLEAVE: SIMULATION OF THE NORTH ATLANTIC DRIFT OF ANCl 7/./..1 



had continued. In most runs the plumes of lep- 

 tocephali in the Gulf Stream had widened, so that 

 concentrations > 10" 7 were present across the mod- 

 eled area between lat. 31° and 46° N. In run E the 10 -3 

 concentrations extended completely from the patch 

 area offshore of Florida to the right border of the 

 modeled area. 



Distribution of Leptocephali After 

 270 Days of Drift 



Nine months after starting the leptocephali in runs 

 A, C, D, and F had been distributed completely along 

 the course of the Gulf Stream (Fig. 8; 26 November). 

 There were very large areas with concentrations be- 

 tween 10" 3 and 10 -2 that spanned the modeled area 

 from offshore of Florida to near the eastern border at 

 long. 40° W. Run B still appeared to be in the process 



of developing the same distributional pattern as the 

 others, because its pattern resembled those of the 

 others 2 mo earlier. Leptocephali had progressed 

 farthest in run E, in which the 10" 3 concentrations 

 were moving away from the mid- Atlantic coast. 



At day 270 the simulations were halted, as some lep- 

 tocephali would have begun metamorphosis to the 

 glass eel phase by late November (Kleckner and 

 McCleave 1980). It is unknown what behavioral com- 

 ponents a glass eel or large leptocephalus may con- 

 tribute during oceanic transport. 



European Eel Drift Simulation 



A simulation of European eel leptocephalus drift 

 was done with the stalling point at lat. 27°N and long. 

 57° W, and the starting date as 15 April. After 45 d of 

 drift the larvae had spread to the northwest (Fig. 9A; 



I I I I I I I I lTf~p 1 l I I I I I I I | I I I I I I I I I | I I I I I I I I l - | 



70 60 50 no 



FIGURE 9.— Concentration contours of European eel leptocephali, expressed as a proportion of the starting concentration. Leptocephali were 

 begun at the point marked with an X in Figure 1 . A: contours for 30 May, 45 d after the 1 5 April start. B: contours for 29 July, 105 d after starting. 

 C: contours for 27 September, 165 d after starting. D: contours for 26 November, 215 d after starting. 



495 



