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Population dynamics of North American light-bellied brent geese as determined by productivity and harvest surveys

Wildfowl

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Abstract

Midwinter inventories of total numbers, population-age ratios in the autumn, and estimates of the total numbers of and age ratios in hunter-killed birds were used to develop a population budget for Atlantic Brant - Lightbellied Brent Geese - Branta bernicla hrota for the period 1968-84. Substantial fluctuations in productivity and survival occurred even in the absence of hunting seasons for 9 of the 17 years. Annual survival estimates ranged from 0.41 to 0.97 for birds> I year of age; mean annual survival for the 17-year period was 0.77, little different from an estimate of 0.78 recently obtained from ringing records. This summary confirms high adult survival for Atlantic Brant as in other long-lived birds with delayed sexual maturity and irregulur breeding failure. The combinution of these factors results in unequal age-cohort representation from year to year. Population size alone, therefore. is not an indicator of population resilience. Proper management should aim to maintain Atlantic Brant at a level sufficient to rebound from sequential breeding and wintering failure. We propose management by age-cohort as the best scheme for tbese geese.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Population dynamics of North American light-bellied brent geese as determined by productivity and harvest surveys
Series title:
Wildfowl
Volume
36
Year Published:
1985
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
49-52
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Wildfowl
First page:
49
Last page:
52