Methods 
Observations were made from the bridge. During a few days when 
uhe wind was very calm or coming from our stern, observations were 
from the flying bridge. From the bridge only about three quarters of 
the horizon could be observed at any one time and many birds were 
surely missed because of this. Watch was maintained during nearly 
all of the diurnal hours that the ship was underway, and occasional 
checks were made when the ship was stopped on station. 
Nocturnal observations were made while under way using a light 
from the Port Boat Deck. No observations were made during the last 
portion of trip because of the full moon. Time on station was not 
recorded as observation time even though occasional sightings were 
made during these periods. 
Discussion 
* 
For convenience of analyses the trip has been divided into 8 
areas: A - Aug 3 - 6 , B - 7~l6 Aug., C - 17-21 Aug., D - 23-28 Aug., 
E - 29 Aug.-2 Sept., F - 3-8 Sept., G - 9-10, 13-15 Sept., H - 16-18 
and 2k Sept. 
Area A - from San Diego to 20N was dominated by Leach Storm 
Petrels and Northern Phalaropes. In the southern part Wedge-tailed 
Shearwaters, New Zealand Shearwaters, and Cook Petrels also became 
very important. These areas included many of the coastal bird- 
fauna as •well as some migrant ducks and landbirds. 
Areas B and F from 20°N to the equator are characterized by a 
concentration of Pterodroma externa near 5°N. This concentration 
occurs at the boundary between the North Equatorial counter current 
and the California coast. 
Areas C and D from the equator to 10°S are very similar with a 
few scattered flocks of Sooty Terns in their southern parts. 
Area E between 2°30 , N and S, along 112°W, Is the area of Dr. 
B. A. Taft T s current studies. August 29 th was spent at the Equator. 
On the 30th to 31st we went to 2°30 T N and back to the Equator, and 
on September 1 and 2, we went to 2°30 r S and back. The only birds of 
note in this area were the Galapagos Storm Petrels following the 
ship, which made up nearly one-half of the observations. 
Area G is the coastal area off Manzanillo Mexico. In this area 
the predominantly land based sea birds such as boobies, terns, and gulls 
make up most of the observations. 
Area H is the final leg northbound from 20°N along the Baja California 
coast to Guadalupe, and between Guadalupe and San Diego. 
