2) Further decrease of Leach Storm Petrel and Red phalarope. 
3) High numbers of Jaegers concentrated in the northeast. 
b) Arctic Terns passing south through the grid area. 
5) Numbers of "lost" landbirds. 
General: 
Eastern Grid Survey # 
Overall linear Density 
19-29 July 
10 
All Birds/linear mile 
8 -l 6 August 
11 
.756 
2o August - 
b September 
12 
. 4 o 4 
11-22 September 
13 
• 521 
.527 Average 
Sectional average 
linear 
density EGS 11, 12, 13: 
.629 1 
1.242 
' 1.580 
.123 ■ 
.331 
’ .515 
.223 ’ 
'. 2 l 4 
' .421 
The relatively consistent survey densities belie the fact that 
a fairly large general changeover in grid avifauna has occurred from 
July to September. During the mid-summer surveys (#s 10 and 11) Sto 
Petrels and Phalaropes accounted for about three-fourths of the tota 
grid birds. During the present survey Storm Petrels and Phalaropes 
accounted for less than one-quarter of the total. The static summer 
population of post or non-breeding birds has largely disappeared. 
In its place migrant species, notably Sooty Shearwaters, Terns, 
Ducks and various landbirds have appeared. 
The bird distribution within the grid has remained about the 
same, concentrations being found in the north, northeast, and east 
portions on all four surveys. At least three factors contribute to 
this general distribution pattern: 1 ) the proximity to land; 2 ) 
oceanographic features; i.e., upwellings and current structure in 
the associated areas; 3 ) tendency for migrant species to parallel 
the coast and thus cross the northeast grid corner. (See Sooty 
Shearwater; an important exception to the last). 
Bath' 
-J- 
.e 
ogicai 
i -f 
ythermographic data were collected and analyzed by Dr. 
The results appear to be quite relevant to certain ornithol- 
'eatures, but will be treated in detail elsewhere. 
