(/) 



E 

 o 



^-» 



1000 



500 



100 



40 



30 



20 



10 







X 

 X 

 X 



I 



<.l 



I 



<.l 



I 



— \ 1 1 III 1 1 III 



JFMAMJJASOND 



month 



=0.1-1.0 1=1.1-10 



MEAN NUMBER OF INDIVIDUALS OBSERVED PER HOUR 



X = ZONE NOT SAMPLED IN THIS MONTH 



Figure 18. Seasonal abundance and seaward distribution patterns of the uniden- 

 tified jaegers in the northern Chesapeake Bight, 1971-1977. 



POMARINE JAEGER ( Stercorarius pomarinus ) 



S tatus . --Probably present in small numbers year round; primarily a tran- 

 sient, uncommon in spring, and fairly common in fall (Fig. 19). 



Earliest record .— SPRING: 25 March 1973. FALL: 8 August 1973. 



Latest record .— SPRING: 29 May 1977. FALL: 6 December 1975. 



Maximum counts. --SPRING: 6 in 3.5 h, 100-125 km E Ocean City, 8 May 

 1977; 6 in 7 ~h, ~7U-95 km E Ocean City, 29 May 1977. FALL: 8 in 11 h, 65-140 

 km ESE Ocean City, 26 September 1976; 37 in 8 h, 40-110 km ESE Ocean City, 4 

 December 1976; 38 in 8 h, 40-110 km ESE Ocean City, 3 December 1977. 



Remarks . --Most pomarine jaegers were seen beyond 40 km from shore. 

 During spring migration, single pomarine jaegers were usually seen flying 

 northward, 1-2 m over the water. Most often, they ignored the boat and chum, 

 although they occasionally lingered when the boat was stationary. The great- 

 est concentrations of pomarine jaegers were recorded in early December with up 

 to 15 in sight at one time, all of which were probably attracted by the flocks 

 of gulls and gannets that gathered about the boat and chum. Most of these 

 jaegers were immatures. 



27 



