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Survival and band recovery rates of sympatric grey ducks and mallards in New Zealand

Journal of Wildlife Management

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Abstract

We used band recovery data from grey ducks (Anas superciliosa) and mallards. (A. platyrhynchos) banded sympatrically during 1957-74 to estimate annual survival and recovery rates. Young birds tended to have higher recovery rates and lower survival rates than adults for both species. Both species showed strong evidence of year-to-year variation in annual survival rates. Survival rates of male mallards were higher than those in females, as is typical for this species in North America, but there was no evidence of sex-specific survival differences in grey ducks. Recovery rate estimates for grey ducks were high and were significantly higher than those for mallards. However, survival rates did not differ significantly between the 2 species within any age-sex class. The similar survival rates, when mallard populations were increasing and grey ducks were decreasing, suggest that mallard reproductive rates have been greater than those of grey ducks.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Survival and band recovery rates of sympatric grey ducks and mallards in New Zealand
Series title:
Journal of Wildlife Management
Volume
55
Issue:
1
Year Published:
1991
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
111-118
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Wildlife Management
First page:
111
Last page:
118
Number of Pages:
8