Estimates of Duck Breeding Populations in the Nebraska Sandhills Using Double Observer Methodology
The Nebraska Sandhills are an important area for breeding ducks in the Great Plains, but reliable estimates of breeding populations are unavailable. Double-observer methodology was used to estimate abundance of breeding duck populations in the Nebraska Sandhills. Aerial transect surveys were conduct...
Main Authors: | , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
DigitalCommons@University of Nebraska - Lincoln
2011
|
Subjects: | |
Online Access: | https://digitalcommons.unl.edu/natrespapers/348 https://digitalcommons.unl.edu/context/natrespapers/article/1352/viewcontent/Powell_WATERBIRDS_2011_Estimattes_duck_breeding.pdf |
id |
ftunivnebraskali:oai:digitalcommons.unl.edu:natrespapers-1352 |
---|---|
record_format |
openpolar |
spelling |
ftunivnebraskali:oai:digitalcommons.unl.edu:natrespapers-1352 2023-11-12T04:01:01+01:00 Estimates of Duck Breeding Populations in the Nebraska Sandhills Using Double Observer Methodology Vrtiska, Mark P. Powell, Larkin A. 2011-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/natrespapers/348 https://digitalcommons.unl.edu/context/natrespapers/article/1352/viewcontent/Powell_WATERBIRDS_2011_Estimattes_duck_breeding.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/natrespapers/348 https://digitalcommons.unl.edu/context/natrespapers/article/1352/viewcontent/Powell_WATERBIRDS_2011_Estimattes_duck_breeding.pdf Papers in Natural Resources Aerial survey Anas detection probabilities double observer Nebraska population estimation Sandhills Natural Resources and Conservation text 2011 ftunivnebraskali 2023-10-30T10:59:07Z The Nebraska Sandhills are an important area for breeding ducks in the Great Plains, but reliable estimates of breeding populations are unavailable. Double-observer methodology was used to estimate abundance of breeding duck populations in the Nebraska Sandhills. Aerial transect surveys were conducted using methodology similar to the cooperative Waterfowl Breeding Population and Habitat Survey conducted by the U.S. Fish and Wildlife Service and Canadian Wildlife Service. Observations by two front-seat observers and one rear-seat observer were used to account for incomplete detectability. Transect-specific population size and detection probabilities were estimated using program SURVIV; estimates were species-specific by type of social grouping. Regional population sizes were obtained by extrapolating transects’ estimates to the Sandhills. Detection probabilities were high (>0.75) for all species, but highest for Northern Shoveler (Anas clypeata) and Gadwall (A. strepera). Detection probabilities generally followed increases or decreases with duck densities. Uncorrected population estimates, on average, were Text Anas clypeata Northern Shoveler Shoveler University of Nebraska-Lincoln: DigitalCommons@UNL |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Aerial survey Anas detection probabilities double observer Nebraska population estimation Sandhills Natural Resources and Conservation |
spellingShingle |
Aerial survey Anas detection probabilities double observer Nebraska population estimation Sandhills Natural Resources and Conservation Vrtiska, Mark P. Powell, Larkin A. Estimates of Duck Breeding Populations in the Nebraska Sandhills Using Double Observer Methodology |
topic_facet |
Aerial survey Anas detection probabilities double observer Nebraska population estimation Sandhills Natural Resources and Conservation |
description |
The Nebraska Sandhills are an important area for breeding ducks in the Great Plains, but reliable estimates of breeding populations are unavailable. Double-observer methodology was used to estimate abundance of breeding duck populations in the Nebraska Sandhills. Aerial transect surveys were conducted using methodology similar to the cooperative Waterfowl Breeding Population and Habitat Survey conducted by the U.S. Fish and Wildlife Service and Canadian Wildlife Service. Observations by two front-seat observers and one rear-seat observer were used to account for incomplete detectability. Transect-specific population size and detection probabilities were estimated using program SURVIV; estimates were species-specific by type of social grouping. Regional population sizes were obtained by extrapolating transects’ estimates to the Sandhills. Detection probabilities were high (>0.75) for all species, but highest for Northern Shoveler (Anas clypeata) and Gadwall (A. strepera). Detection probabilities generally followed increases or decreases with duck densities. Uncorrected population estimates, on average, were |
format |
Text |
author |
Vrtiska, Mark P. Powell, Larkin A. |
author_facet |
Vrtiska, Mark P. Powell, Larkin A. |
author_sort |
Vrtiska, Mark P. |
title |
Estimates of Duck Breeding Populations in the Nebraska Sandhills Using Double Observer Methodology |
title_short |
Estimates of Duck Breeding Populations in the Nebraska Sandhills Using Double Observer Methodology |
title_full |
Estimates of Duck Breeding Populations in the Nebraska Sandhills Using Double Observer Methodology |
title_fullStr |
Estimates of Duck Breeding Populations in the Nebraska Sandhills Using Double Observer Methodology |
title_full_unstemmed |
Estimates of Duck Breeding Populations in the Nebraska Sandhills Using Double Observer Methodology |
title_sort |
estimates of duck breeding populations in the nebraska sandhills using double observer methodology |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2011 |
url |
https://digitalcommons.unl.edu/natrespapers/348 https://digitalcommons.unl.edu/context/natrespapers/article/1352/viewcontent/Powell_WATERBIRDS_2011_Estimattes_duck_breeding.pdf |
genre |
Anas clypeata Northern Shoveler Shoveler |
genre_facet |
Anas clypeata Northern Shoveler Shoveler |
op_source |
Papers in Natural Resources |
op_relation |
https://digitalcommons.unl.edu/natrespapers/348 https://digitalcommons.unl.edu/context/natrespapers/article/1352/viewcontent/Powell_WATERBIRDS_2011_Estimattes_duck_breeding.pdf |
_version_ |
1782329332031553536 |