Red Phalarope 

 Long-tailed Jaeger 

 Skua 

 Arctic Tern 



Birds in this category include: first, mi- 

 grants from the South or North Pacific that pass 

 through the area rapidly on their way to or 

 from more northerly or more southerly waters, 

 and, second, birds that breed to the south of the 

 area and winter mainly in the central Pacific 

 (between the Equatorial Countercurrent and the 

 Hawaiian Islands). Direct migrants demonstrate 

 no marked distribution pattern in the study area 

 that indicates orientation or navigation based 

 on the position of the islands of the Hawaiian 



group. Birds that breed south of the area slow- 

 ly infiltrate into it during the nonbreeding sea- 

 son so that the net effect is one of greatest 

 abundance at the southern end, even though 

 some birds, such as Juan Fernandez Petrel, 

 are in all parts of the study area during peak 

 months. 



4. Species that were observed in roughly the 

 same density regardless of distance from 

 land: 



Black-footed Albatross 

 Laysan Albatross 

 Leach's Storm Petrel 

 Red-tailed Tropicbird 



Table 5. — Numbers of sea birds seen per 10 linear miles (18.5 km.) of observation at 



varying distances from nearest land 



Species 



Miles from land 



Period 



50 



100 



200 



300 



AOO 



500 



600 



700 



Black-footed Albatross Total 1.12 0.37 0.74 0.76 0.83 0.23 0.50 0.01 



Wedge-tailed Shearwater 



dark-phase Total 0.11 0.08 0.03 0.07 0.10 0.72 0.38 1.84 



68 



