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500 - 



100- 



40 - 



30 - 



20 - 



10- 



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X 



— r 1 1 1 1 1 I 



JFMAMJJA 



month 



X 

 X 

 X 



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137 



118 



111 



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77 



54 



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1=0.1-1.0 



MEAN NUMBER OF INDIVIDUALS OBSERVED PER HOUR 



X = ZONE NOT SAMPLED IN THIS MONTH 



Figure 11. Seasonal abundance and seaward distribution patterns of the 



Audubon's shearwater in the northern Chesapeake Bight, 1971-1977. 



BLACK-CAPPED PETREL (P terodroma hasi tata ) 



S tatus . --Probably a casual vagrant in late sumrrer and early fall, when 

 warm waters intrude northward along the edge of the Continental Shelf. 



Records.--! recorded 

 (Rowlett in press b). 



128 km E Chincoteague (37°54'N, 73°54'W), Virginia 



R emarks . --Formerly believed to be a casual visitor off the east coast of 

 the U.S. as a result of tropical storms (Robbins et al . 1S68), but recent 

 evidence indicates that this rare gadfly petrel of the Caribbean regularly 

 forages in small numbers along the Gulf Stream off North Carolina (Lee 1977, 

 Rowlett in press d). The numerous sightings off North Carolina and the one 

 off Virainia were on choppy to rough days when winds ranged from 15 - 20 knots 

 (28-37 "km/hr). The black-capped "petrel is a swift flyer and seldom lingers 

 around vessels for more than a few seconds. 



LEACH'S STORM PETREL ( Oceanodro ma leucorhoa ) 



Status. --Rare and widely dispersed from late April to mid-August. Pro- 

 bably present in fall with perhaps a few stragglers in winter, especially over 

 deeper waters along the edge of the Continental Shelf (Fig. 12). 



Earliest r ecord . --30 April 1577. 



18 



