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Montana Field Guide

Montana Field Guides

Wilson's Phalarope - Phalaropus tricolor

Native Species

Global Rank: G5
State Rank: S4B
(see State Rank Reason below)


Agency Status
USFWS: MBTA
USFS:
BLM:
PIF: 3


 

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Copyright by: The Macaulay Library at the Cornell Lab of Ornithology, Ithaca, NY, all rights reserved.
State Rank Reason (see State Rank above)
Species is apparently secure and not at risk of extirpation or facing significant threats in all or most of its range.
  • Details on Status Ranking and Review
    Wilson's Phalarope (Phalaropus tricolor) Conservation Status Review
    Review Date = 09/15/2008
    Population Size

    ScoreU - Unknown

    CommentUnknown.

    Range Extent

    ScoreG - 200,000-2,500,000 km squared (about 80,000-1,000,000 square miles)

    Comment380530 square kilometers based on Natural Heritage Program range maps

    Area of Occupancy

    ScoreG - 2,000-20,000 km squared (500,000-5,000,000 acres)

    Comment2033 square kilometers based on GAP predicted model.

    Long-term Trend

    ScoreE - Relatively Stable (±25% change)

    CommentUse reservoirs fairly widely so probably relatively stable compared to pre European times.

    Short-term Trend

    ScoreE - Stable. Population, range, area occupied, and/or number or condition of occurrences unchanged or remaining within ±10% fluctuation

    CommentBreeding Bird Survey (BBS) data 1966-2007 trend is -1.5% per year; BBS 1980-2007 trend is -1.9% per year

    Threats

    ScoreG - Slightly threatened. Threats, while recognizable, are of low severity, or affecting only a small portion of the population or area.

    CommentWetland loss. Climate Change, Contaminants

    SeverityLow - Low but nontrivial reduction of species population or reversible degradation or reduction of habitat in area affected, with recovery expected in 10-50 years.

    CommentSpecies use modified habitats as long as it is of a preferred structure.

    ScopeLow - 5-20% of total population or area affected

    CommentCan use natural wetlands or reservoirs in drainages

    ImmediacyHigh - Threat is operational (happening now) or imminent (within a year).

    CommentOngoing and climate change could increase threat

    Intrinsic Vulnerability

    ScoreC - Not Intrinsically Vulnerable. Species matures quickly, reproduces frequently, and/or has high fecundity such that populations recover quickly (< 5 years or 2 generations) from decreases in abundance; or species has high dispersal capability such that extirpated populations soon become reestablished through natural recolonization (unaided by humans).

    Environmental Specificity

    ScoreB - Narrow. Specialist. Specific habitat(s) or other abiotic and/or biotic factors (see above) are used or required by the Element, but these key requirements are common and within the generalized range of the species within the area of interest.

    CommentCan use a wide variety of wetlands.

 
General Description
Small (22 to 24 cm) aquatic sandpiper with fringed toes, needle-like bill, white underparts and rump. During the breeding season, larger females are more brightly plumaged than males. Breeding females possess pale blue gray forehead and crown; white supercilium borders black streak that passes from lores, through and below the eye, down sides of neck; white streak trails from back of head, down nape to upper back; throat cinnamon buff; chestnut scapulars and mantle; wings gray brown and underparts and rump white; tail pale grayish; bill black, legs grayish to black. Breeding males are smaller and generally less brightly plumaged. Nonbreeding plumage of both sexes: pale gray above and underparts and rump white (Colwell and Jehl 1994).

For a comprehensive review of the conservation status, habitat use, and ecology of this and other Montana bird species, please see Marks et al. 2016, Birds of Montana.

Species Range
Montana Range Range Descriptions

All Ranges
Summer
Migratory
(Click legend blocks to view individual ranges)

Western Hemisphere Range

 


Observations in Montana Natural Heritage Program Database
Number of Observations: 6848

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

SUMMER (Feb 16 - Dec 14)
Direct Evidence of Breeding

Indirect Evidence of Breeding

No Evidence of Breeding

WINTER (Dec 15 - Feb 15)
Regularly Observed

Not Regularly Observed


 

(Observations spanning multiple months or years are excluded from time charts)



Migration
In the Bozeman area, normal migration periods are from May 4 to 30, and July 7 to September 1; peak numbers were on May 15 and August 15 (Skaar 1969).

Habitat
During spring, the species is widespread in the valley in lakes, ponds and flooded fields. Summer birds are restricted to marshy borders of lakes and ponds (Skaar 1969).

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 (common or occasional) of each of the 82 ecological systems mapped in Montana for vertebrate animal species that regularly breed, overwinter, or migrate through the state by:
    1. 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 2012, Adams 2003, and Werner et al. 2004);
    2. Evaluating structural characteristics and distribution of each ecological system relative to the species' range and habitat requirements;
    3. Examining the observation records for each species in the state-wide point observation database associated with each ecological system;
    4. 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 listed as associated with 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 listed as 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.  Common versus occasional association with an ecological system was assigned based on the degree to which the structural characteristics of an ecological system matched the preferred structural habitat characteristics for each species as represented in scientific 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 assignment of common versus occasional association.  If you have any questions or comments on species associations with ecological systems, please contact the Montana Natural Heritage Program's Senior Zoologist.

    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: mtnhp.org/requests) 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.

    Literature Cited
    • 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.  2012.  Mammals of Montana.  Second edition.  Mountain Press Publishing, Missoula, Montana.  429 pp.
    • 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
Small aquatic invertebrates in freshwater or hypersaline environments; also some terestrial invertebrates. On breeding grounds forages on open water and flooded meadows, less frequently in upland habitats and along beaches (Colwell and Jehl 1994).

Reproductive Characteristics
Nests in sparse to dense vegetation of uplands, marshes, and roadside ditches. Nest is a grass-lined depression. Eggs oval to pyriform, buff with slight gloss, covered with brown spots/blotches. Brooding by male only. Modal clutch size 5 (Colwell and Jehl 1994). Nesting is in June (Davis 1961). Young chicks were in the water near Fortine from June 26 to August 13.


References
  • Literature Cited AboveLegend:   View Online Publication
    • Colwell, M. A., and J. R. Jehl, Jr. 1994. Wilson's Phalarope (Phalaropus tricolor). Species Account Number 083. The Birds of North America Online (A. Poole, Ed.). Ithaca, NY: Cornell Laboratory of Ornithology; Retrieved 3/25/2008 from The Birds of North America Online database
    • Davis, C.V. 1961. A distributional study of the birds of Montana. Ph.D. Dissertation. Corvallis, OR: Oregon State University. 462 p.
    • Marks, J.S., P. Hendricks, and D. Casey. 2016. Birds of Montana. Arrington, VA. Buteo Books. 659 pages.
    • Skaar, P.D. 1969. Birds of the Bozeman latilong: a compilation of data concerning the birds which occur between 45 and 46 N. latitude and 111 and 112 W. longitude, with current lists for Idaho, Montana, Wyoming, impinging Montana counties and Yellowstone National Park. Bozeman, MT. 132 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • American Ornithologists’ Union [AOU]. 1998. Check-list of North American birds, 7th edition. American Ornithologists’ Union, Washington, D.C. 829 p.
    • Bird Conservancy of the Rockies. 2017. Pocket Guide to Northern Prairie Birds. Brighton, CO: Bird Conservancy of the Rockies. 98 p.
    • Bramblett, R.G., and A.V. Zale. 2002. Montana Prairie Riparian Native Species Report. Montana Cooperative Fishery Research Unit, Montana State University - Bozeman.
    • Bromberger, M.L. 1984. Quantitative assessment of the nesting habitat of Wilson's Phalarope. Wilson Bull. 96(1): 126-128.
    • Cameron, E. S. 1907. The birds of Custer and Dawson counties, Montana. Auk 24(3): 241-270.
    • Casey, D. 2000. Partners in Flight Draft Bird Conservation Plan Montana. Version 1.0. 287 pp.
    • Casey, D. 2005. Rocky Mountain Front avian inventory. Final report. Prepared for the U.S. Fish and Wildlife Service and The Nature Conservancy by the American Bird Conservancy, Kalispell, Montana.
    • Colwell, M. A. and J. R. Jehl. 1994. Wilson’s Phalarope (Phalaropus tricolor). In The Birds of North America, No. 83 (A. Poole and F. Gill, eds.). Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists’ Union. 20 pp.
    • Colwell, M.A. 1992. Wilson's Phalarope nest success is not influenced by vegetation concealment. Condor 94(3): 767-772.
    • Colwell, M.A. and L.W. Oring. 1990. Nest site characteristics of prairie shorebirds. Can. J. Zool. 68: 297-302.
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