Remarks . — Parasitic jaegers are found in all zones over the Continental 

 Shelf. In the shallow nearshore waters, smaller seabirds such as terns and 

 Bonaparte's gulls are most common, and are suitable targets for pirating para- 

 sitic jaegers. The larger, less aggressive pomarines generally stay further 

 offshore than the parasitic jaeger, and are often found in association with 

 the larger more cumbersome gulls. 



Approximately 30% of all immature jaegers could not be identified (Fig. 

 18). Medium-sized to small jaegers created the greatest identification pro- 

 blems. 



E 

 o 



1000 



500 



100 



40 



30 



20 



10 







X 

 X 

 X 



X 

 X 

 X 



I I 

 IJ. 



J 



1 1 — ^ — ^ 1 — ^ — ^ 1 1 — ^r 



FMAMJJASOND 



ri37 



-118 \fl 



-111 ^ 



-95 a> 



-77 E 



- 54 ^ 



- 19 ^2 

 



month 



1=0.1-1.0 1=1.1-10 



MEAN NUMBER OF INDIVIDUALS OBSERVED PER HOUR 

 X = ZONE NOT SAMPLED IN THIS MONTH 



Figure 17. Seasonal abundance and seaward distribution patterns of the para- 

 sitic jaeger in the northern Chesapeake Bight, 1971-1977. 



26 



