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Survival of juvenile ring-necked ducks on wetlands of different pH

Journal of Wildlife Management

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Abstract

Brood and duckling survival of ring-necked ducks (Aythya collaris) was examined in relation to wetland water chemistry in eastcentral Maine during 1983-85. Daily survival rates (DSR) of broods and ducklings were determined for 381 ducklings from 64 broods by counts of each brood at 6-10-day intervals during broodrearing. Twelve of 64 females lost entire broods. Only 176 of 381 (46%) ducklings survived to fledge. Brood survival for the 45-day rearing period was 0.7731; duckling survival was 0.3707. Young ducklings (<24 days) survived at a lower rate (0.9750/day) than older (>25 days) ducklings (0.9818/day) (P = 0.002). Survival rates of broods and ducklings did not differ among wetlands of high and low alkalinities. Brood survival did not differ among wetlands of different pH, but DSR of ducklings was lower (0.9763/day) on low-pH (<6.0) wetlands than on high-pH (>6.1) wetlands (0.9816/day) (P = 0.049). Class lIb-III (25-45 days old) ducklings from the lowest-pH wetlands(<5.5) had the lowest DSR (0.9752) while Class lIb-III ducklings from the highest-pH wetlands (>6.5) had the highest DSR (0.9856) (P = 0.009).

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Survival of juvenile ring-necked ducks on wetlands of different pH
Series title:
Journal of Wildlife Management
Volume
52
Issue:
2
Year Published:
1988
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
169-176
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
169
Last page:
176
Number of Pages:
8