Datasets / Nowitna NWR swan surveys, 1987

Nowitna NWR swan surveys, 1987

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Published By US Fish and Wildlife Service, Department of the Interior

Issued almost 10 years ago

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Summary

Type of release
a one-off release of a single dataset

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Description

Spring and fall aerial surveys and a ground species identification survey were conducted on the Nowitna NWR in 1987. Totals of 158 swans and 38 nests were observed during the spring survey. Total swans increased 17.1 and the number of nests 34.9 over 1986 on 15 survey units surveyed both years. One hundred and fiftythree swans, including 64 juveniles, were observed during the fall survey. The number of juveniles increased 88.1 over 1985 on 5 survey units surveyed both years. All swans identified to species during the ground survey were trumpeter swans.

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