Monitoring emperor goose populations by aerial survey counts and fall age ratio

Metadata Updated: December 13, 2019

From 1985.to 1994, we photographed flocks of emperor geese (Chen canagica) during fall migration at lagoons along the north side of the Alaska Peninsula. The gray head plumage of juvenile geese contrasted with the uniform white heads of older geese. Cluster sampling by photographs within each lagoon and stratified sampling among lagoons provided unbiased estimates of age ratio applicable to the entire population. The number of geese counted at each lagoon during an independent shoreline 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. Averaging from 1985-1994, 22.1% of the fall emperor goose population were first-year birds; the age ratio ranged from 22-25% young in most years except for 1985 and 1992 with 15-16% young. Total population size increased from 1985 to 1994 at a average annual growth rate of 1.032. The mean annual survival rate, combined for age and sex classes, was 0.806.

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.

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References

https://ecos.fws.gov/ServCat/Reference/Profile/53378

References

https://ecos.fws.gov/ServCat/Reference/Profile/53378

Dates

Metadata Created Date May 1, 2019
Metadata Updated Date December 13, 2019

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date May 1, 2019
Metadata Updated Date December 13, 2019
Publisher Fish and Wildlife Service
Unique Identifier FWS_ServCat_53378
Maintainer
Brent Frakes
Maintainer Email
Public Access Level restricted public
Bureau Code 010:18
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Harvest Object Id 602bdacf-6d3e-4fd3-8286-b94df2f0c69f
Harvest Source Id 34ce571b-cb98-4e0b-979f-30f9ecc452c5
Harvest Source Title DOI CKAN Harvest Source
Data First Published 1995-09-13
Homepage URL https://ecos.fws.gov/ServCat/Reference/Profile/53378
Data Last Modified 1995-09-13
Program Code 010:094, 010:028
Related Documents "https://ecos.fws.gov/ServCat/Reference/Profile/53378"
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.
Source Datajson Identifier true
Source Hash f2c23c8f1bc839081705ccfd8f87e5d106220160
Source Schema Version 1.1
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Category "Unpublished Report"

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