
Breaking down the westward shift by 5 units shows a variation 
in where the kill took vlace as follows: 
110°-115° 115°- 120° 120°-Pacific Ocean 
1954 1.6% Helis 3.3% 
1955 1% 220% 205% 
The variation in harvest along the east flight is more evident; 
110° 105°- 100°. 959 90° ~ 859°= §80°-Atlantiec 
105°. 1000, 959 909 859. ~—s 80° Ocean 
95h 205K = 58K = 21.03% = 2740S) 33K 2 = BK 16K 
1955 8.64 9.64 We6S 21.7% held 1.02 020% 
From north to south there is also a significant differeme: 
195k 195 
49° = North 29.5% 295% 3709% 379% 
Yh? = 49° 211.5% 41.0% 12.68 50.5% 
39° = byh,° 23.8% 6.8% 31.3% 81.8% 
3° = 39° 16.4% ~81.2% 11.6% 924% 
28° = 3);° 18.8% 100.0% 6.6% 100.0% 
By the above approach it is easy to see the differences between 
the two years and to make a correlation with the weather and other 
factors. 
The sane data by flyway areas give the followings 
North Pacific Central Mississippi Atlantic _ 
195h 29.5% 8.2% 32.8% 27.0% «245% 
1955 37.9% 5.6% 2h. 7% 31.8% 0.0% 
This breakdown by flyway areas shows that there was a reversal — 
in the proportions taken in the Central and Mississippi areas between 
the two years, but it is not immediately evident why. From the grids 
it is evident that the main flight both years was southeastward from 
Saskatchewan across the Dakotas (Central area) into Illinois ~. 
(Mississippi area) and then south into Texas (Central area). The -— 
heavier kill in the Central area in 195) was the result of the ducks 
migrating farther and crossing from the Mississippl area back into — 
the Central area, 
