Survival of cackling Canada geese, 1982-1988
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Abstract
We estimated seasonal and annual survival rates of cackling Canada geese (Branta canadensis minima) for the period 1982-1989 to identify periods of high mortality and assess effects of harvest management decisions. We tested hypotheses about age- and sex specific variation in survival, seasonal variation in survival rates, and variation in survival between years in which hunting seasons were open and closed. Geese were marked with individually identifiable neckbands and observed from autumn through spring. We used these data to estimate survival rates for 3-month periods in early (EW) and late (LW) winter and a 6-month period in summer (SU). Mean annual survival rates of immature females were lower than those of adults over the entire study. Survival rates of immature males were lower than those of adults during the 2 years with sport hunting seasons. We found no evidence of sex-specific differences in seasonal or annual survival rates of immature geese. Mean survival rates of adult males and females were similar during EW and LW, but there was evidence of higher survival of females during SU. Annual survival rates of adult females were higher than those of adult males. Mean annual survival rates of adult females and immatures of both sexes were lower in the years during which sport hunting was permitted. Tests for different survival rates in years before and after an agreement with the Eskimos to cease summer hunting yielded equivocal results.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Survival of cackling Canada geese, 1982-1988 |
| Series title | Journal of Wildlife Management |
| DOI | 10.2307/3808791 |
| Volume | 56 |
| Issue | 1 |
| Year Published | 1992 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 11 p. |
| First page | 63 |
| Last page | 73 |
| Country | United States |
| State | Alaska, California |