13 
Table 7. Percent nesting and hatching success of various populations of Canada geese. 

Hatching 
Nests Hatching success, 
Nesting destroyed Nests success, successful 
Subspecies success by predators deserted all nests nests only Source 
B. c. hutchinsii and parvipes 75-908 MacInnes 1962 
B, c. moffitti 70 12 14 65 89 Hanson and Browning 1959 
B. c. moffitti 51-73 16-28 11-17 62 86-90 Geis 1956 
“large race” 27-80 14-50 4-2] 77-90 Vermeer 1970 
B. c. occidentalis 32-83 15-65 3-4 28-67 Bromley 1976 
B. c. occidentalis 80 Trainer 1959 
B. c. maxima 65-82 5 ll 67 Cooper 1978 
B. c. interior 78-83 17-22 78-85  Raveling and Lumsden 1977 
B. c. minima 72 28 Eisenhauer and Kirkpatrick 1977 
B. c. minima 65 28 68 Mickelson 1975 
B. c. leucopareia 91 9 75 81 This study 



4All values rounded to nearest whole percent. 
Table 8. Fate of Aleutian Canada goose eggs at Buldir Island, Alaska, 1975-76. 


1975 1976 Both years 
Number Percent Number Percent Number Percent 
Fate of eggs of total of eggs of total of eggs of total 
Hatched 
All nests 204 78.2 276 72.5 473 74.8 
Successful nests 86.1 77.1 80.7 
Fate unknown@ 28 10.7 67 18.1 97 15.3 
Deserted» 13 5.0 14 3.8 97 4.3 
Infertile* 8 3.1 14 3.8 22, 3.5 
Embryo death¢ 8 3.1 6 1.6 14 2,2 
Total eggs 261 37] - 632 

*Eggs recorded when nests were found that were not accounted for during rechecks. Possible explanations include predators carrying 
eggs away from nests, scavenging gulls removing membranes of hatched eggs, and wind blowing membranes from nests. 
bEggs left in nests where no eggs hatched. 
‘Eggs left in successful nests. 
Table 9. Family group counts of Aleutian Canada geese at Buldir Island, Alaska, August-September 1976. 
Number of fledglings per pair 



Total Fledglings 
1 2 3 4 5 6 7 families per family 
Number of families 9 28 66 49 66 31 6 255 3.99 + 0.0084 — 
aMean + standard error. 
For our method of calculating fledging success to be 
accurate, individual broods must be distinguishable. Several 
flocks containing multiple broods were recorded at Buldir, 
but most flightless groups were probably intact on the basis 
of the uniform weights and stage of plumage development 
of the young. 
family group size is large compared with other populations: 
3.7 and 3.2 for B. c. maxima at Seney National Wildlife 
Refuge (calculated from G. A. Sherwood, unpublished 
report), 3.0 and 2.8 for the same subspecies in Colorado 
(calculated from Szymezak 1975), and 3.7 for B. c. minima 
on the Yukon—Kuskokwim Delta, Alaska (Mickelson 1975), 
