Monitoring emperor goose populations by aerial counts and fall age ratio - 2002

Metadata Updated: October 10, 2019

In 2002, we photographed flocks of emperor geese (Chen canagica) during fall migration at lagoons along the north side of the Alaska Peninsula for the 18th consecutive year. The gray head plumage of young geese differs from the uniform white heads of adult geese. Cluster sampling by photographs within each lagoon and stratified sampling among lagoons provided an unbiased estimate of age ratio for the entire population. The number of geese counted at each lagoon during an independent aerial survey determined the strata weights. Annual estimation of age ratio and total fall population size were used to monitor annual production, population size, and estimate average survival rate. Data from 1985-2002 indicated an average 19% of the fall emperor goose population were young birds. The age ratio ranged from 15-26%. The average annual population growth rate was 1.002 from 1985 to 2002 as calculated by exponential regression. The combined-age annual survival rate averaged 0.831.

Access & Use Information

Restricted: This dataset can only be accessed or used under certain conditions. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.
The information resource is proprietary and/or copyrighted. Access to this information by the public is very limited. Please contact the associated Point of Contact regarding additional use constraints and requirements for obtaining the information.

Downloads & Resources

References

https://ecos.fws.gov/ServCat/Reference/Profile/53343

References

https://ecos.fws.gov/ServCat/Reference/Profile/53343

Dates

Metadata Created Date May 1, 2019
Metadata Updated Date October 10, 2019

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date May 1, 2019
Metadata Updated Date October 10, 2019
Publisher Fish and Wildlife Service
Unique Identifier FWS_ServCat_53343
Maintainer
Brent Frakes
Maintainer Email
Public Access Level restricted public
Bureau Code 010:18
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Schema Version https://project-open-data.cio.gov/v1.1/schema
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Data Quality true
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Harvest Object Id 33134c45-9231-41e9-89a1-eea3be50b5a4
Harvest Source Id 34ce571b-cb98-4e0b-979f-30f9ecc452c5
Harvest Source Title DOI CKAN Harvest Source
Data First Published 2002-12-20
Homepage URL https://ecos.fws.gov/ServCat/Reference/Profile/53343
Data Last Modified 2002-12-20
Program Code 010:094, 010:028
Related Documents "https://ecos.fws.gov/ServCat/Reference/Profile/53343"
Rights The information resource is proprietary and/or copyrighted. Access to this information by the public is very limited. Please contact the associated Point of Contact regarding additional use constraints and requirements for obtaining the information.
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Source Schema Version 1.1
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Category "Unpublished Report"

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