Blue-winged Teal - Anas discors
Species slightly sexually dimorphic. Both sexes have a large chalky blue patch on upper wing; brighter blue in males. Males in breeding plumage have large, gray head with a large white crescent in front of eye; cinnamon under parts heavily speckled with black spots. Female body plumage mottled brown with whitish patch at base of bill; dark line through eye, small whitish crescents above and below eye; and grayish to yellow legs and feet.
Western Hemisphere Range
Summary of Observations Submitted for Montana
Number of Observations:
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
(direct evidence "B")
(indirect evidence "b")
No evidence of Breeding
(regular observations "W")
(at least one obs. "w")
(Observations spanning multiple months or years are excluded from time charts)
The Bozeman migration occurs from April 20 to May 30 and earlier and from September to October 15, with the peak May 15 and earlier. In September 1957, 300 were seen on Hebgen Lake during fall migration (Skaar 1969).
Main habitat consists of shallow ponds with adequate supplies of aquatic invertibrates. Prefers to nest in grass or herbaceous vegetation and rarely uses brushy nesting cover.
Ecological Systems Associated with this Species
- Details on Creation and Suggested Uses and Limitations
How Associations Were Made
We associated the use and habitat quality (high, medium, or low) of each of the 82 ecological systems mapped in Montana for
vertebrate animal species that regularly breed, overwinter, or migrate through the state by:
- Using personal observations and reviewing literature that summarize the breeding, overwintering, or migratory habitat requirements of each species (Dobkin 1992, Hart et al. 1998, Hutto and Young 1999, Maxell 2000, Foresman 2001, Adams 2003, and Werner et al. 2004);
- Evaluating structural characteristics and distribution of each ecological system relative to the species’ range and habitat requirements;
- Examining the observation records for each species in the state-wide point database associated with each ecological system;
- Calculating the percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system to get a measure of “observations versus availability of habitat”.
Species that breed in Montana were only evaluated for breeding habitat use, species that only overwinter in Montana were only evaluated for overwintering habitat use, and species that only migrate through Montana were only evaluated for migratory habitat use.
In general, species were associated as using an ecological system if structural characteristics of used habitat documented in the literature were present in the ecological system or large numbers of point observations were associated with the ecological system.
However, species were not associated with an ecological system if there was no support in the literature for use of structural characteristics in an ecological system, even if
point observations were associated with that system.
High, medium, and low habitat quality was assigned based on the degree to which the structural characteristics of an ecological system matched the preferred structural habitat characteristics for each species in the literature.
The percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system was also used to guide assignments of habitat quality.
If you have any questions or comments on species associations with ecological systems, please contact Bryce Maxell at email@example.com
or (406) 444-3655.
Suggested Uses and Limitations
Species associations with ecological systems should be used to generate potential lists of species that may occupy broader landscapes for the purposes of landscape-level planning.
These potential lists of species should not be used in place of documented occurrences of species (this information can be requested at: http://mtnhp.org/requests/default.asp
) or systematic surveys for species and evaluations of habitat at a local site level by trained biologists.
Users of this information should be aware that the land cover data used to generate species associations is based on imagery from the late 1990s and early 2000s and was only intended to be used at broader landscape scales.
Land cover mapping accuracy is particularly problematic when the systems occur as small patches or where the land cover types have been altered over the past decade.
Thus, particular caution should be used when using the associations in assessments of smaller areas (e.g., evaluations of public land survey sections).
Finally, although a species may be associated with a particular ecological system within its known geographic range, portions of that ecological system may occur outside of the species’ known geographic range.
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Diet consists of aquatic inveritbrates, seeds, vegetative parts of aquatic plants, duckweeds, algae, and occasional grains from agricultural crops. Animal matter dominates diet of laying females.
At Freezeout Lake, skunks were the major cause of unsuccessful nests.
In north-central Montana brood size was 5.9. Nesting records are from mid-May to August 20. At Freezeout Lake, grassland nests were more successful (18.5%) than those in other habitat types (14.3%). The average clutch size was 5.8. Hatching dates were from May 21 to August 10. In the Fortine area, egg dates were from June 13 to July 31.
- Additional ReferencesLegend: View WorldCat Record View Online Publication
Do you know of a citation we're missing?
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