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Late summer survival of adult female and juvenile spectacled eiders on the Yukon-Kuskokwim Delta, Alska

Waterbirds

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, , , and

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Abstract

We used radio-telemetry to examine survival of adult female and juvenile Spectacled Eiders (Somateria fischeri) from 30 days after hatch until departure from the Yukon-Kuskokwim Delta (YKD) during 1997-1999. Juvenile survival was 71.4%; adult female survival was 88.5%. Mink (Mustella vison) were the most common predator identified for both adults and juveniles. Detectable levels of lead were found in bones of 74% of juvenile carcasses recovered and 21% had levels indicative of acute exposure. Average age at departure was 59 ?? 1 days old for juveniles and 56 ?? 1 days after hatch for adults. Most broods (60.5%) departed the YKD synchronously. Overall our data indicate that mortality during the latter half of brood-rearing is higher than previously thought. We conclude that brood rearing is a period of high mortality for brood-rearing females and that lead poisoning is responsible for reductions in juvenile survival to fledging. Received 15 February 2000, accepted 1 April 2000.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Late summer survival of adult female and juvenile spectacled eiders on the Yukon-Kuskokwim Delta, Alska
Series title:
Waterbirds
Volume
23
Issue:
2
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Waterbirds
First page:
292
Last page:
297