File:Gadwall Hen Seedskadee NWR (15970987502).jpg
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Summary
[edit]DescriptionGadwall Hen Seedskadee NWR (15970987502).jpg |
Gadwalls are medium-sized ducks characterized by a general lack of bright coloration. Male gadwalls are gray-brown with a white belly and a black rump. In flight, a white speculum and chestnut and black portions on the wing coverts are displayed. The bill is slate-gray and the legs and feet are yellow. The male utters a short "nheck" and a low whistle. Female gadwalls are similar to males, but have a mottled brown appearance, a yellowish bill with dark spots and a smaller white speculum. She utters a repeated "gag-ag-ag-ag-ag," higher in pitch than the mallard. Gadwall breed near seasonal and semi-permanent wetlands, mainly in the shortgrass, tallgrass and mixed prairie regions of the United States and Canada. Substantial numbers also breed in wetland habitats of the Great Basin. Gadwall tend to begin breeding later than most ducks. Female gadwall nest in fields and meadows, and on islands and dikes in wetlands, and lay an average of 7-12 eggs. Gadwall are distributed throughout the southern two-thirds of the United States in winter, with the greatest concentrations found in the Central and Mississippi flyways. They are found throughout much of the intermountain west of North America, and most of Mexico, in reservoirs, farm ponds and coastal fresh and brackish marshes. They are often found in association with American wigeon and coots. The North American gadwall population remained stable through the 1970s and early 1980s, while populations of other waterfowl species generally declined. Since the late 1980s, the gadwall population has increased to record levels, with the most recent estimates in the 3-million-bird range, due to improved wetland habitat conditions. Aquatic vegetation makes up the majority of the gadwall's diet. As a result, they are often found feeding far from the shoreline, in deeper water than most other dabbling ducks. Gadwall up-end to feed on leafy portions of pondweed, naiad, wigeon grass, water milfoil and algae, as well as the seeds of pondweed, smartweed, bulrush and spike rush. They also feed on aquatic invertebrates, such as crustaceans and midges. <a href="http://www.ducks.org/hunting/waterfowl-id/gadwall#ad-image-0" rel="nofollow">www.ducks.org/hunting/waterfowl-id/gadwall#ad-image-0</a> Photo: Tom Koerner/USFWS |
Date | |
Source | Gadwall Hen Seedskadee NWR |
Author | USFWS Mountain-Prairie |
Licensing
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This image was originally posted to Flickr by USFWS Mountain Prairie at https://flickr.com/photos/51986662@N05/15970987502. It was reviewed on 17 May 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
17 May 2018
Public domainPublic domainfalsefalse |
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This image or recording is the work of a U.S. Fish and Wildlife Service employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain. For more information, see the Fish and Wildlife Service copyright policy.
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current | 04:16, 17 May 2018 | ![]() | 1,890 × 1,418 (1.49 MB) | OceanAtoll (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D300 |
Author | Picasa |
Exposure time | 1/1,250 sec (0.0008) |
F-number | f/18 |
ISO speed rating | 1,000 |
Date and time of data generation | 18:51, 5 October 2014 |
Lens focal length | 500 mm |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Ver.1.10 |
File change date and time | 18:03, 7 December 2014 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 18:51, 5 October 2014 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 5.3 APEX (f/6.28) |
Metering mode | Center weighted average |
Light source | Flash |
Flash | Flash did not fire |
DateTime subseconds | 00 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 750 mm |
Scene capture type | Standard |
Scene control | High gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Unique image ID | 632f50b45b9a50c9b0086d764f48c2ab |
IIM version | 4 |