Development of an aerial breeding pair survey for geese nesting in the Copper River Delta

Metadata Updated: December 11, 2019

The U.S. Fish and Wildlife Service initiated a new aerial survey of breeding dusky Canada geese (Branta canadensis occidentalis) on the Copper River Delta in 1986 and modified it in 1987. The survey was developed to improve the precision of breeding pair estimates and to document changes in nesting distribution. Five strata were used for population indices: Egg Island, east delta, and the west delta which was divided into coastal, intermediate and interior strata. Standard aerial survey techniques for breeding pairs were used utilizing a Cessna 206. Helicopter-fixed wing comparisons were made with a Bell 206 Jet Ranger. In 1986, 48 transects totaling 684 km and in 1987 43 transects totaling 621 km were flown by fixed-wing aircraft. In 1987, 15 transects (totaling 192 km) were overflown with rotary-wing aircraft. The breeding pair index decreased from 2,171 pairs in 1986 to 1,876 pairs in 1987, a decrease of 11 percent. The index for total geese also decreased 11 percent in 1987. Castle Island, a part of the west coast delta strata, and Egg Island generally had the densest numbers of nesting geese. The east delta and west delta interior strata were the least utilized. Variance of population estimates increased from 1986 to 1987. The 95 percent confidence interval expressed as a percentage of the mean increased from 12.5 percent in 1986 to 23.2 percent in 1987. The most variable strata in each year was the west coast delta, primarily due to the effects of Castle Island within this strata. The ratio of helicopter to fixed-wing observations for pairs plus singles was 1.42. Recommendations to improve the survey were made.

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/53359

References

https://ecos.fws.gov/ServCat/Reference/Profile/53359

Dates

Metadata Created Date May 1, 2019
Metadata Updated Date December 11, 2019

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date May 1, 2019
Metadata Updated Date December 11, 2019
Publisher Fish and Wildlife Service
Unique Identifier FWS_ServCat_53359
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 d1c40926-ae47-4b71-82a2-1367a71da728
Harvest Source Id 34ce571b-cb98-4e0b-979f-30f9ecc452c5
Harvest Source Title DOI CKAN Harvest Source
Data First Published 1988-03-01
Homepage URL https://ecos.fws.gov/ServCat/Reference/Profile/53359
Data Last Modified 1988-03-01
Program Code 010:094, 010:028
Related Documents "https://ecos.fws.gov/ServCat/Reference/Profile/53359"
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 17e0f3e364d508e913c89de420ef8cf4783ab34c
Source Schema Version 1.1
Spatial -146.096191,59.96601,-143.327637,60.93043
Category "Unpublished Report"

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