2 
Bathythermograph casts were made at four-hour intervals in the cen¬ 
tral and southern portions of the Grid. For reference the BT slides were 
photographed individually against the calibrated Grid and printed on 
8 x 10 contact sheets. A copy of these prints is included with this re¬ 
port as Figure 3• 
All positions on this survey and on EGS 10 and 11 are LORAN fixes. 
LORAN accuracy on the first third northern leg is poor. All other fixes 
are considered accurate within the limits of LORAN (2 to 5 miles). 
Results of Discussion 
During diurnal observations from the tugs and YAG of 109-1 hours and 
957 miles 452 birds were recorded. These observations are summarized in 
Table 1. The observations from the two vessels are treated equally. No 
discussion of the validity of such treatment is undertaken at this time. 
Nocturnal observations are summarized in Table 3- 
Again on this survey diurnal coverage was good in each of the nine 
sectors of the Grid. Numerical abundance and densities of species groups 
are included in Tables 4 and 5- North-South and East-West sectional 
breakdowns are Tables 6 and 7- About 46 percent of the observations were 
recorded in the northern third of the Grid. A near-equal percentage of 
observations was recorded in the eastern third. The previously recorded 
northward movement of storm petrels and their concentrations around Point 
Dogwood during EGS 10 and Point Ash on EGS 11, plus the presence of most 
of the phalaropes recorded in the northern and eastern sections strongly 
suggests the presence of "richer" waters in the northern third of the 
Grid. The same is generally true of the eastern third of the Grid. The 
cause for this is believed (without concrete evidence at this time) to be 
that both of these areas lie in more active areas, i.e., faster flowing, 
of the California Current. The faster currents affect the north sec¬ 
tion of the area, then around Point Conception and shift eastward. 
It then asserts strong influence only on the eastern third of the area. 
If this rambling hypothesis be correct it would explain bird abundance on 
the basis of environment rather than by proximity to land masses (which 
seams a weak explanation for distribution of many recorded pelagic sea¬ 
birds) . 
The recorded abundance of Storm Petrels in the southwest section 
(sector 7) of the Grid is not valid. On 2 September the skiff was used 
for four hours; during this time k'J percent of the day's total was re¬ 
corded. This was effected as follows: The seas were calm, increasing the 
radius of visibility by possibly 2K; the ship was running at 7K> allowing 
the skiff to work up to 2+ miles on each side of the ship - this again 
increasing the radius of observation. As all birds seen from the skiff 
were radioed to the ship and recorded there, it effectively increased the 
number of birds recorded by two to four times. No effort was made to ad¬ 
just these data in the presentation as this is difficult to achieve with 
statistical significance. 
Ten Storm Petrels, one Red Phalarope, and one Cook’s Petrel were col 
lected in seven hours of skiff operation on two separate days. 
