Waterfowl Population Status, 2001
In the traditional survey area (strata 1-18, 20-50, and 75-77), total duck abundance was 36.1 ± 0.6 [SE] million birds. This was 14% below (P< 0.001) last year’s estimate of 41.8 ± 0.7 million birds, but still 9% above the long-term (1955-2000) average (P < 0.001). Mallard (Anas platyrhynchos)...
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2001
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ftunivnebraskali:oai:digitalcommons.unl.edu:usfwspubs-1401 2023-11-12T04:01:01+01:00 Waterfowl Population Status, 2001 Garrettson, Pamela R. Moser, Timothy J. Wilkins, Khristi 2001-07-20T07:00:00Z application/pdf https://digitalcommons.unl.edu/usfwspubs/402 https://digitalcommons.unl.edu/context/usfwspubs/article/1401/viewcontent/status01Reduced.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/usfwspubs/402 https://digitalcommons.unl.edu/context/usfwspubs/article/1401/viewcontent/status01Reduced.pdf US Fish & Wildlife Publications text 2001 ftunivnebraskali 2023-10-30T09:48:45Z In the traditional survey area (strata 1-18, 20-50, and 75-77), total duck abundance was 36.1 ± 0.6 [SE] million birds. This was 14% below (P< 0.001) last year’s estimate of 41.8 ± 0.7 million birds, but still 9% above the long-term (1955-2000) average (P < 0.001). Mallard (Anas platyrhynchos) abundance was 7.9 ± 0.2 million, which is 17% below (P<0.001) the 2000 estimate of 9.5 ± 0.3 million and similar to the long-term average (P=0.08). Blue-winged teal (Anas discors) abundance was 5.8 ± 0.3 million, which was 23% below last year’s estimate of 7.4 ± 0.4 million (P=0.001), but 29% above the long-term average (P = 0.001). Green-winged teal (Anas crecca) abundance was 2.5 ± 0.2 million, 39% above the long-term average (P<0.001) but 21% lower than last year (P=0.007). Gadwall (Anas strepera; 2.7 ± 0.1 million, +66%) and northern shovelers (Anas clypeata; 3.3 ± 0.2 million, +60%), were above their long-term averages (P < 0.04), while northern pintails (Anas acuta; 3.3 ± 0.3 million, -23%) and scaup (Aythya marila and A. affinis combined; 3.7 ± 0.2 million, -31%) remained below their long-term averages (P<0.01). Redheads (Aythya americana; 0.7 + 0.07 million) were 23% below 2000 numbers (P=0.04), and similar to their long-term average (P=0.22). American wigeon (Anas Americana; 2.5 + 0.1 million) and canvasback (Aythya valisineria; 0.6 + 0.05 million) estimates were similar to those of last year (P≥0.19) and to long-term averages (P≥0.22). Habitat conditions in May in the traditional survey area were generally wetter than last year, but varied considerably among areas. The estimate of May ponds in Prairie Canada and the U.S. combined was 4.6 ± 0.1 million, up 18% from 2000, but not statistically different from the long-term average (P=0.07). The eastern survey area comprises strata 51-56 and 62-69. The 2001 total duck population estimate for the eastern survey area was 3.3 ± 0.3 million birds, similar to last year’s total duck estimate of 3.2 ± 0.3 million birds. Abundances of individual species ... Text Anas acuta Anas clypeata Aythya marila University of Nebraska-Lincoln: DigitalCommons@UNL Canada |
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Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
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ftunivnebraskali |
language |
unknown |
description |
In the traditional survey area (strata 1-18, 20-50, and 75-77), total duck abundance was 36.1 ± 0.6 [SE] million birds. This was 14% below (P< 0.001) last year’s estimate of 41.8 ± 0.7 million birds, but still 9% above the long-term (1955-2000) average (P < 0.001). Mallard (Anas platyrhynchos) abundance was 7.9 ± 0.2 million, which is 17% below (P<0.001) the 2000 estimate of 9.5 ± 0.3 million and similar to the long-term average (P=0.08). Blue-winged teal (Anas discors) abundance was 5.8 ± 0.3 million, which was 23% below last year’s estimate of 7.4 ± 0.4 million (P=0.001), but 29% above the long-term average (P = 0.001). Green-winged teal (Anas crecca) abundance was 2.5 ± 0.2 million, 39% above the long-term average (P<0.001) but 21% lower than last year (P=0.007). Gadwall (Anas strepera; 2.7 ± 0.1 million, +66%) and northern shovelers (Anas clypeata; 3.3 ± 0.2 million, +60%), were above their long-term averages (P < 0.04), while northern pintails (Anas acuta; 3.3 ± 0.3 million, -23%) and scaup (Aythya marila and A. affinis combined; 3.7 ± 0.2 million, -31%) remained below their long-term averages (P<0.01). Redheads (Aythya americana; 0.7 + 0.07 million) were 23% below 2000 numbers (P=0.04), and similar to their long-term average (P=0.22). American wigeon (Anas Americana; 2.5 + 0.1 million) and canvasback (Aythya valisineria; 0.6 + 0.05 million) estimates were similar to those of last year (P≥0.19) and to long-term averages (P≥0.22). Habitat conditions in May in the traditional survey area were generally wetter than last year, but varied considerably among areas. The estimate of May ponds in Prairie Canada and the U.S. combined was 4.6 ± 0.1 million, up 18% from 2000, but not statistically different from the long-term average (P=0.07). The eastern survey area comprises strata 51-56 and 62-69. The 2001 total duck population estimate for the eastern survey area was 3.3 ± 0.3 million birds, similar to last year’s total duck estimate of 3.2 ± 0.3 million birds. Abundances of individual species ... |
format |
Text |
author |
Garrettson, Pamela R. Moser, Timothy J. Wilkins, Khristi |
spellingShingle |
Garrettson, Pamela R. Moser, Timothy J. Wilkins, Khristi Waterfowl Population Status, 2001 |
author_facet |
Garrettson, Pamela R. Moser, Timothy J. Wilkins, Khristi |
author_sort |
Garrettson, Pamela R. |
title |
Waterfowl Population Status, 2001 |
title_short |
Waterfowl Population Status, 2001 |
title_full |
Waterfowl Population Status, 2001 |
title_fullStr |
Waterfowl Population Status, 2001 |
title_full_unstemmed |
Waterfowl Population Status, 2001 |
title_sort |
waterfowl population status, 2001 |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2001 |
url |
https://digitalcommons.unl.edu/usfwspubs/402 https://digitalcommons.unl.edu/context/usfwspubs/article/1401/viewcontent/status01Reduced.pdf |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Anas acuta Anas clypeata Aythya marila |
genre_facet |
Anas acuta Anas clypeata Aythya marila |
op_source |
US Fish & Wildlife Publications |
op_relation |
https://digitalcommons.unl.edu/usfwspubs/402 https://digitalcommons.unl.edu/context/usfwspubs/article/1401/viewcontent/status01Reduced.pdf |
_version_ |
1782329274101923840 |