Nelson's Sparrow - Ammodramus nelsoni
The Nelson's Sparrow is a small sparrow averaging about 5 inches in length. Adults of both sexes are similar in appearance with males larger on average than females. The eyebrow and malar stripe are an obvious orange-buffy color, sharply defined. The ear coverts are gray and the crown is gray striped with brown borders streaked with black. The upperparts are a rich olive-brown and the back is dark with distinct white streaks. The tail is brown and sharply tapered. The breast, flanks and sides are buffy-orange and the abdomen is white. The flanks are faintly streaked and the central breast is unstreaked. The juvenile is similar to the adult in appearance except the crown and ear coverts are brownish rather than gray (Greenlaw and Rising 1994).
Nelson's Sparrows have no central stripe on their dark crown. This characteristic can distinguish Nelson's from similar Le Conte's Sparrows, which do have a distinct pale, central stripe. Another characteristic separating these two species is the lack of striping on the side neck and nape of the Nelson's Sparrow (Greenlaw and Rising 1994).
Summary of Observations Submitted for Montana
Number of Observations:
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(direct evidence "B")
(indirect evidence "b")
No evidence of Breeding
(regular observations "W")
(at least one obs. "w")
(Records associated with a range of dates are excluded from time charts)
The migratory pattern of this species in Montana is poorly known. A general lack of observations limits any educated guess about their migratory pathway within the state. Only 5 observations have been made regarding Nelson's Sparrows during migration in Montana (Lenard et al. 2003). Four observations were recorded in May and June and 1 was recorded in August. All observations were made in Sheridan County, Montana where this species is known to occur and breed.
There is very little information about the habitat for this species in Montana, however it is assumed that the habitat is similar to that used in other portions of the species' range. This species prefers freshwater wetlands with dense, emergent vegetation or damp areas with dense grasses (Bownan 1904, Murray 1969, Stewart 1975, Krapu and Green 1978, Knapton 1979, Williams and Zimmer 1992, Berkey et al. 1993). In North Dakota, Nelson's Sparrows were common in prairie cordgrass (Spartina pectinata) stands, occurred at the edges of common reed (Phragmites australis) stands, and nested in sprangletop (Murray 1969). In northeastern North Dakota, they nested in thin, sparse grass on a wet alkali flat (Rolfe 1899, Hill 1968).
Nests usually are built in stands of grasses with litter that is persistent from year to year (Greenlaw and Rising 1994). Nests are built on or slightly above the ground in damp areas among emergent vegetation (Murray 1969, Stewart 1975). In North Dakota, Nelson's Sparrows are more abundant in dry years than in wet years (Stewart 1975). In dry years, they nest in the shallow-marsh and deep-marsh zones of wetlands. In wet years, they nest in cordgrass (Spartina spp.) within wet-meadow zones.
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 firstname.lastname@example.org
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.
- Adams, R.A. 2003. Bats of the Rocky Mountain West; natural history, ecology, and conservation. Boulder, CO: University Press of Colorado. 289 p.
- Dobkin, D. S. 1992. Neotropical migrant land birds in the Northern Rockies and Great Plains. USDA Forest Service, Northern Region. Publication No. R1-93-34. Missoula, MT.
- Foresman, K.R. 2001. The wild mammals of Montana. Special Publication No. 12. Lawrence, KS: The American Society of Mammalogists. 278 p.
- Hart, M.M., W.A. Williams, P.C. Thornton, K.P. McLaughlin, C.M. Tobalske, B.A. Maxell, D.P. Hendricks, C.R. Peterson, and R.L. Redmond. 1998. Montana atlas of terrestrial vertebrates. Montana Cooperative Wildlife Research Unit, University of Montana, Missoula, MT. 1302 p.
- Hutto, R.L. and J.S. Young. 1999. Habitat relationships of landbirds in the Northern Region, USDA Forest Service, Rocky Mountain Research Station RMRS-GTR-32. 72 p.
- Maxell, B.A. 2000. Management of Montana’s amphibians: a review of factors that may present a risk to population viability and accounts on the identification, distribution, taxonomy, habitat use, natural history, and the status and conservation of individual species. Report to U.S. Forest Service Region 1. Missoula, MT: Wildlife Biology Program, University of Montana. 161 p.
- Werner, J.K., B.A. Maxell, P. Hendricks, and D. Flath. 2004. Amphibians and reptiles of Montana. Missoula, MT: Mountain Press Publishing Company. 262 p.
Food habits information on Nelson's Sparrow is currently unavailable in the state. Information from other areas of the species' range reveal that Nelson's Sharp-tailed Sparrows eat insects, spiders, amphipods, and other small invertebrates, supplemented in the colder months by seeds and grains. They glean food from ground or from grass stems.
No ecological information regarding Nelson's Sparrows exists for Montana. In general, Nelson's Sparrows nest in colonies and may be non-territorial (Murray 1969, Greenlaw and Rising 1994). However, they do respond to recorded playbacks of songs, which suggests some territoriality (D. R. C. Prescott, pers. comm.). They are interspecifically territorial with Le Conte's Sparrows (Ammodramus leconteii) (Murray 1969, D. R. C. Prescott, pers. comm.).
It is believed that this species breeds in the state on an annual basis. However, only a single breeding occurrence from 1995 is documented. This observation indicates a brood fledged in August 1995 from extreme eastern Sheridan County near Round Lake. Other observations of singing males have been documented in the vicinity and surrounding area, but no direct evidence of breeding was noted.
No other information on species' reproduction in Montana has been recorded. Information from other portions of the species' range indicates that eggs are laid mostly in late spring and early summer. Clutch size is three to seven (usually three to five). Commonly two broods per year are produced. Incubation lasts about 11 days and is performed by the female alone. Young are tended by the female and leave the nest at 10 days but they are dependent on the female for about 20 days more.
No known active management is ongoing for Nelson's Sparrows in the state. Conservation Reserve Program practices may provide large blocks of suitable habitat for this species in northeastern Montana.
- Additional ReferencesLegend: View WorldCat Record View Online Publication
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- American Ornithologists' Union. 1983. Check-list of North American birds, 6th ed. Amer. Ornithologists' Union, Washington, D.C.
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- Bownan, C.W. 1904. Nelson's Sharp-tailed Sparrow in North Dakota. Auk 21:385-386.
- Breckenridge, W.J. 1930. Breeding of Nelson's Sparrow (AMMOSPIZA NELSONI) with special reference to Minnesota. Occasional Paper of the Museum of Natural History, University of Minnesota 3:29-38.
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- Montana Natural Heritage Program. 2003. Data derived from Element Occurences with no other known source material. BIOTICS. Helena, MT.
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- Roberts, T. S. 1932. The Birds of Minnestoa. Vol. 2. University of Minnesota Press, Minneapolis, Minnesota. 821 pp.
- Rolfe, E.S. 1899. Nesting of Nelson's Sparrow (AMMODRAMUS NELSONI) in North Dakota. Auk 16:356-357.
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