evident in some of the individual species,i.e., Tahiti Petrel and Juan 
Fernandez Petrel. Why this relationship should exist cannot he 
determined at present. 
The best correlation between birds and the pelagic environment 
seems to be a negative one - where there is a scarcity of food and 
nutrients in the water there are few birds. Such an area was found 
this trip between 15°S and 20°S, where only an average of 11 .3 birds 
per day were seen. 
Probable Land Bases of Species Seen in the Study Area 
The following table is an attempt to show the origin of the 
birds in the study area. For most of the species this is highly 
speculative but in some cases (e.g., Black-footed Albatross) it is 
definite because these areas are the only places where the species 
nest. 
Species Seen Only off California (North American) 
Arctic Loon 
Brown Pelican 
Cormorant (sp.) 
Surf Scoter 
Western Gull 
Cassinis Auklet 
Ping-billed Gull 
Heermann r s Gull 
Black-legged Kittiwake 
Poyal Tern 
North and Central American Coast 
Wedge-tailed Shearwater(dark 
Manx Shearwater + 
Leach*s Storm Petrel + 
Red-billed Tropicbird 
Red-footed Booby + 
Red-Phalarope + 
phase)+ Blue-faced Booby + 
Pomarine Jaeger + 
Long-tailed Jaeger + 
Herring Gull 
California Gull 
Sooty Tern 4- 
Hawaiian Islands including Leewards 
Black-footed Albatross + 
Laysan Albatross 
Wedge-tailed Shearwater (light phase) + 
Red-tailed Tropicbird + 
