This report summarizes the results of a pelagic survey of Smithsonian Grid 
I from 2230 hours 17 November until 1800 hours 23 November, 1966 . Smithsonian 
personnel included Brian Harrington (Biologist in charge), T. James Lewis, 
Frank Smith, and Walter Bulmer. Excellent cooperation was received from 
Captain Church, the officers, and crew of the U.S.S. GEORGE EASTMAN (YAG 39) 
tnroughout the survey period. Faulty LORAN receiving equipment and frequent over¬ 
cast periods made navigation difficult, but positions are considered accurate 
within 5-10 miles on 22 and 23 November, and within five miles during the 
remainder of the grid survey. The grid track is shown on map one. 
Diurunal observations covered 68.8 hours and 679 miles within the grid 
area, and an additional 62.4 hours of nocturnal observations were conducted, 
1.5 of which were spent drifting on the night of 22-23 November. 
Nocturnal observations were conducted in an attempt to clarify the activity 
of Sooty Terns and other species. A discussion of this phase of the survey 
is included in the species accounts, but none of the observations are included 
% 
in tne density figures. 
It should be emphasized that a comparison of nocturnal and diurnal survey 
vS difficult due to the fact that some species seem to be attracted to the ship 
at night; it is also possible that others may avoid the ship during the nocturnal 
hours. 
Bird density varied considerably from one area of the grid to another. For 
purposes of discussion the grid has been divided into quadrants (see map one) 
and the species density figures have been compiled in table 3* Generally these 
figures demonstrate that resident birds (i.e., all but transient migrants) were 
most abundant in the northern and western quadrants of the grid, which also 
coincides with the areas supporting the most feeding flocks. 
