} 
! 
t 
This report is a summary of observations and collections made by P.O.B.D.?. 
personnel in the eastern Pacific Ocean from 1-10 April, 1967 . Participating 
observers included Brian Harrington (biologist-in-charge), Richard Heiden, and 
James Lewis. Superior cooperation was received from the officers and crew of 
the U.S.N.S. SHEARWATER (T-AG 177). Tne grid cruise track (see map 1) was 
followed closely, and all positions are considered accurate within five miles 
except on 4 April when they may have been slightly less accurate due to contin¬ 
uous cloudy weather which prevented an accurate fix. One major deviation from 
the nominal cruise track on 8 April near point "M" was a result of orders 
di: .,cs_.nr tne SHEARWATER to follow and identify a Russian fishing boat. 
This report is divided into two sections; the first deals with the eastern 
. _s survey while the second summarizes the non-grid portion of the cruise. 
EASTERN GRID SURVEY NO. £ 
The eastern grid survey was conducted from 1215 hours 2 April until 1900 
hours 9 April, 1967 • A total of 94.8 hours of diurnal survey was conducted over 
967 linear miles. A summary may be found in table 1. An additional 14 hour 
s o 
-r* 
nocturnal~observation were conducted ancr~ ars oummari ae d in tabl o 5 » 
Weather data during this survey were recorded on appropriate forms and AD? 
sheets. In general, light winds and seas predominated during the first third of 
the survey, and were followed by moderate winds and seas over the remainder of tne 
grid trip. These conditions were simi". enou a to those of the previous two 
sur.. to make reasonable comparison^ of populations between the three. 
In general, the bird population collected on this survey confirmed tne 
occurrence of migrational movements s 
previous two surveys. These changes 
id ' being under way duron Cl tne 
oe . jcussed in the species accounts. 
..amnals comprised a very signifc c ct e' mtage of the total air- .-a thing 
ti.n; recorded on this survey. In fact, fro. tne standpoint of numbers, they 
ins ore common than birds by more than two to one. And as mammals are more 
