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Spring-summer survival rates of yearling versus adult mallard females

Journal of Wildlife Management

4833_Reynolds.pdf
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Abstract

Knowledge of the timing, magnitude, and cause of mortality in wildlife populations is imperative for developing management strategies that protect or improve the status of these populations. Age- and sex-specific population parameter estimates provide the most useful information for this purpose. Numerous studies have provided information about survival rates in mallards (Anas platyrhynchos), but little is known about age-related differences in female survival during the breeding period. We examined band-recovery data for female mallards banded in southern portions of Alberta, Saskatchewan, and Manitoba during spring and summer 1981-85. We used band-recovery models to test the hypothesis that yearling females would exhibit higher survival compared with that of older females during spring-summer. There was evidence (P = 0.08) that spring-summer survival rates of yearling females (0.728) were higher than that of older females (0.574). These findings support the hypothesis that age-specific differences in nesting behavior (e.g., later nest initiation and fewer nesting attempts by yearlings) influence losses to predators and are responsible for the difference in spring-summer survival. Management treatments that increase nest success, and consequently reduce the need for prolonged nesting, will increase mallard survival during spring-summer.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Spring-summer survival rates of yearling versus adult mallard females
Series title:
Journal of Wildlife Management
Volume
59
Issue:
4
Year Published:
1995
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
691-696
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Wildlife Management
First page:
691
Last page:
696