Trends in Duck Breeding Populations 1955-2011
Services' (CWS) Waterfowl Breeding Population and Habitat Survey. We do not include information from surveys conducted by state or provincial agencies. In the traditional survey area, which includes strata 1-18, 20-50, and 75-77 (Figure 1), the total duck population estimate (excluding scoters...
Main Authors: | , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
DigitalCommons@University of Nebraska - Lincoln
2011
|
Subjects: | |
Online Access: | https://digitalcommons.unl.edu/usfwspubs/289 https://digitalcommons.unl.edu/context/usfwspubs/article/1288/viewcontent/2011Trends_in_Breeding_Duck_Populations.pdf |
id |
ftunivnebraskali:oai:digitalcommons.unl.edu:usfwspubs-1288 |
---|---|
record_format |
openpolar |
spelling |
ftunivnebraskali:oai:digitalcommons.unl.edu:usfwspubs-1288 2024-09-30T14:40:14+00:00 Trends in Duck Breeding Populations 1955-2011 Zimpfer, Nathan L. Rhodes, Walter E. Silverman, Emily D. Zimmerman, Guthrie S. Richkus, Ken D. 2011-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/usfwspubs/289 https://digitalcommons.unl.edu/context/usfwspubs/article/1288/viewcontent/2011Trends_in_Breeding_Duck_Populations.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/usfwspubs/289 https://digitalcommons.unl.edu/context/usfwspubs/article/1288/viewcontent/2011Trends_in_Breeding_Duck_Populations.pdf United States Fish and Wildlife Service: Publications text 2011 ftunivnebraskali 2024-09-02T07:48:20Z Services' (CWS) Waterfowl Breeding Population and Habitat Survey. We do not include information from surveys conducted by state or provincial agencies. In the traditional survey area, which includes strata 1-18, 20-50, and 75-77 (Figure 1), the total duck population estimate (excluding scoters [Melanitta spp.], eiders [Somateria spp. and Polysticta stelleri ], long- tailed ducks [Clangula hyemalis], mergansers [Mergus spp. and Lophodytes cucullatus], and wood ducks [Aix sponsa]) was 45.6 ± 0.8 [SE] million birds. This represents an 11% increase over last year's estimate of 40.9 ± 0.7 million, and is 35% higher than the long-term averagea (1955-2010; Table 1). The estimated mallard (Anas platyrhynchos) abundance was 9.2 ± 0.3 million, which was 9% above the 2010 estimate of 8.4 ± 0.3 million, and 22% above the long-term average of 7.5 ± 0.04 million (Table 2). Estimated abundance of gadwall (A. strepera; 3.3 ± 0.2 million) was similar to the 2010 estimate and 80% above the long-term average (1.8 ± 0.02 million; Table 3). The estimate for American wigeon (A. americana; 2.1 ± 0.1 million) was 14% below the 2010 estimate and 20% below the long-term average (Table 4). The estimated abundance of green-winged teal (A. crecca) was 2.9 ± 0.2 million, which was 17% below the 2010 estimate and 47% above the long- term average (Table 5). The estimate of blue-winged teal abundance (A. discors) was 8.9 ± 0.4 million, which was 41% and 91% above the 2010 estimate and the long-term average, respectively (Table 6). The estimate for northern pintails (A. acuta; 4.4 ± 0.3 million) was 26% above the 2010 estimate of 3.5 ± 0.2 million and similar to the long-term average (Table 7). The northern shoveler (A. clypeata) estimate was 4.6 ± 0.2 million which was 14% above the 2010 estimate and 98% above the long-term average (Table 8). Redhead abundance (Aythya americana; 1.4 ± 0.1 million) was 27% above the 2010 estimate and 106% above the long-term average (Table 9). The canvasback estimate (A. valisineria; 0.7 ± 0.05 ... Text Northern Shoveler Polysticta stelleri Shoveler University of Nebraska-Lincoln: DigitalCommons@UNL |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
description |
Services' (CWS) Waterfowl Breeding Population and Habitat Survey. We do not include information from surveys conducted by state or provincial agencies. In the traditional survey area, which includes strata 1-18, 20-50, and 75-77 (Figure 1), the total duck population estimate (excluding scoters [Melanitta spp.], eiders [Somateria spp. and Polysticta stelleri ], long- tailed ducks [Clangula hyemalis], mergansers [Mergus spp. and Lophodytes cucullatus], and wood ducks [Aix sponsa]) was 45.6 ± 0.8 [SE] million birds. This represents an 11% increase over last year's estimate of 40.9 ± 0.7 million, and is 35% higher than the long-term averagea (1955-2010; Table 1). The estimated mallard (Anas platyrhynchos) abundance was 9.2 ± 0.3 million, which was 9% above the 2010 estimate of 8.4 ± 0.3 million, and 22% above the long-term average of 7.5 ± 0.04 million (Table 2). Estimated abundance of gadwall (A. strepera; 3.3 ± 0.2 million) was similar to the 2010 estimate and 80% above the long-term average (1.8 ± 0.02 million; Table 3). The estimate for American wigeon (A. americana; 2.1 ± 0.1 million) was 14% below the 2010 estimate and 20% below the long-term average (Table 4). The estimated abundance of green-winged teal (A. crecca) was 2.9 ± 0.2 million, which was 17% below the 2010 estimate and 47% above the long- term average (Table 5). The estimate of blue-winged teal abundance (A. discors) was 8.9 ± 0.4 million, which was 41% and 91% above the 2010 estimate and the long-term average, respectively (Table 6). The estimate for northern pintails (A. acuta; 4.4 ± 0.3 million) was 26% above the 2010 estimate of 3.5 ± 0.2 million and similar to the long-term average (Table 7). The northern shoveler (A. clypeata) estimate was 4.6 ± 0.2 million which was 14% above the 2010 estimate and 98% above the long-term average (Table 8). Redhead abundance (Aythya americana; 1.4 ± 0.1 million) was 27% above the 2010 estimate and 106% above the long-term average (Table 9). The canvasback estimate (A. valisineria; 0.7 ± 0.05 ... |
format |
Text |
author |
Zimpfer, Nathan L. Rhodes, Walter E. Silverman, Emily D. Zimmerman, Guthrie S. Richkus, Ken D. |
spellingShingle |
Zimpfer, Nathan L. Rhodes, Walter E. Silverman, Emily D. Zimmerman, Guthrie S. Richkus, Ken D. Trends in Duck Breeding Populations 1955-2011 |
author_facet |
Zimpfer, Nathan L. Rhodes, Walter E. Silverman, Emily D. Zimmerman, Guthrie S. Richkus, Ken D. |
author_sort |
Zimpfer, Nathan L. |
title |
Trends in Duck Breeding Populations 1955-2011 |
title_short |
Trends in Duck Breeding Populations 1955-2011 |
title_full |
Trends in Duck Breeding Populations 1955-2011 |
title_fullStr |
Trends in Duck Breeding Populations 1955-2011 |
title_full_unstemmed |
Trends in Duck Breeding Populations 1955-2011 |
title_sort |
trends in duck breeding populations 1955-2011 |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2011 |
url |
https://digitalcommons.unl.edu/usfwspubs/289 https://digitalcommons.unl.edu/context/usfwspubs/article/1288/viewcontent/2011Trends_in_Breeding_Duck_Populations.pdf |
genre |
Northern Shoveler Polysticta stelleri Shoveler |
genre_facet |
Northern Shoveler Polysticta stelleri Shoveler |
op_source |
United States Fish and Wildlife Service: Publications |
op_relation |
https://digitalcommons.unl.edu/usfwspubs/289 https://digitalcommons.unl.edu/context/usfwspubs/article/1288/viewcontent/2011Trends_in_Breeding_Duck_Populations.pdf |
_version_ |
1811642732067684352 |