MacGillivray's Warbler - Geothlypis tolmiei
FWP Conservation Tier
Generally shy and elusive and often difficult to detect. A small wood-warbler, 10 to 15 cm. Green above, yellow below, with gray hood. White eye crescents, 1 above and below each eye, present in all plumages. Immatures have yellow underparts, olive-green upperparts and eye crescents, brown-gray (not gray) hood; throat tends to be grayish white (Pitocchelli 1995).
Summary of Observations Submitted for Montana
Number of Observations:
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Map Help and Descriptions
(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)
In Bozeman area, normal migration periods are May 25 to June 5 and August 20.
Commonly found in riparian habitat and clearcuts of northern coniferous forests along the Rocky Mountains. Forages along streams or in dense second growth (Pitocchelli 1995).
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.
- 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.
- Commonly Associated with these Ecological Systems
Forest and Woodland Systems
Open Water / Wetland and Riparian Systems
Shrubland, Steppe and Savanna Systems
- Occasionally Associated with these Ecological Systems
Forest and Woodland Systems
Main food is insects. Feeds on or just above the ground (Pitocchelli 1995).
Nests in riparian habitat along river and stream banks, also steep coulee slopes, undergrowth of deciduous and mixed-woods forests, logging clearcuts and areas recovering from avalanches. Cup nest. Clutch size is 3 to 5 eggs. Eggs are short, ovate, creamy white, spotted neutral/brown (Pitocchelli 1995). Near Fortine, egg dates range from June 7 to June 30. In northwest Montana, it nests from second week in June into third week of July.
- Additional ReferencesLegend: View WorldCat Record View Online Publication
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- American Ornithologists' Union. 1998. Check-list of North American birds. 7th edition. American Ornithologists' Union, Washington, D.C. 829 pp.
- Blakesley, J.A. and K.P. Reese. 1988. Avian use of campground and non-campground sites in riparian zones. J. Wildl. Manage. 52: 399-402.
- Casey, D. 2000. Partners in Flight Draft Bird Conservation Plan Montana. 281 pp.
- Dobkin, D. S. 1992. Neotropical migrant landbirds in the Northern Rockies and Great Plains. U.S.D.A. For. Serv. N. Region Publ. R1-93-34. Missoula, Mont.
- Dobkin, D.S. 1994. Conservation and management of neotropical migrant landbirds in the Northern Rockies and Great Plains. Univ. Idaho Press, Moscow, Idaho. 220 pp.
- Dunn, J.L. and K.L. Garrett. 1997. A field guide to warblers of North America. Houghton and Mifflin Publ., Boston, Mass. x + 656 pp.
- Ehrlich, P., D. Dobkin, and D. Wheye. 1988. The Birder’s Handbook, A Field Guide to the Natural History of North American Birds. Simon and Schuster Inc. New York. 785 pp.
- Griscom, L. and A. Sprunt, Jr. 1979. The warblers of America. Doubleday and Co., Garden City, N.Y. 302 pp.
- Harrison, H.H. 1979. A field guide to western birdsnests. Houghton Mifflin Co., Boston. 279 pp.
- Hejl, S.J. and R.E. Woods. 1991. Bird assemblages in old-growth and rotation-aged Douglas-fir/ponderosa pine stands in the northern Rocky Mountains: a preliminary assessment. Pages 285-292 in D. M. Baumgartner and J. E. Lotan, eds. Symposium proceedings, interior Douglas-fir: the species and its management. Wash. State Univ., Pullman.
- Hejl, S.J., R.L. Hutto, C.R. Preston, and D.M. Finch. 1995. Effects of silvicultural treatments in the Rocky Mountains. Pages 220-244 in T. E. Martin and D. M. Finch, eds. Ecology and Management of Neotropical Migratory Birds. Oxford Univ. Press, New York.
- Hutto, R. L. and J. S. Young. 1999. Habitat relationships of landbirds in the Northern Region, USDA Forest Service. Gen. Tech. Rep. RMRS-GTR-32. Ogden, UT: U. S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 72 pp.
- Hutto, R.L. 1981. Seasonal variation in the foraging behavior of some migratory western wood warblers. Auk 98: 765-777.
- Hutto, R.L. 1995a. Composition of bird communities following stand-replacement fires in Northern Rocky Mountain (U.S.A.) conifer forests. Conservation Biology 9: 1041-1058.
- Johnsgard, P. A. 1986. Birds of the Rocky Mountains with particular reference to national parks in the Northern Rocky Mountain region. Colorado Associated University Press, Boulder. xi + 504 pp.
- Lenard, S., J. Carlson, J. Ellis, C. Jones, and C. Tilly. 2003. P. D. Skaar's Montana Bird Distribution, 6th Edition. Montana Audubon: Helena, MT, 144 pp.
- Martin, T.E. 1996. Fitness costs of resource overlap among coexisting bird species. Nature 380: 338-340.
- Morrison, M.L. 1981. The structure of western warbler assemblages: analysis of foraging behavior and habitat selection in Oregon. Auk 98: 578-588.
- Mosconi, S.L. and R.L. Hutto. 1982. The effects of grazing on the landbirds of a western Montana riparian habitat. Pages 221-233 in J.M. Peek and P.D. Dalke (eds.), Wildlife-Livestock Relationships Symp. Forest Wildlife Range Exp. Station, Univ. Idaho, Moscow.
- Munts, M.A. 1994. A comparison of bird communities between an untreated control and two timber harvest treatments in western Montana. M.S. Thesis, Univ. Montana, Missoula. 49 pp.
- OEA Research, Helena, MT., 1982, Beal Mine Wildlife Report. June 17, 1982.
- Pitocchelli, J. 1995. MacGillivray's warbler (Oporornis tolmiei). In A. Poole and F. Gill (eds.), The Birds of North America, No. 159. Philadelphia: The Academy of Natural Sciences; Washington D.C.: The American Ornithologists Union.
- Pitocchelli, Jay. 1995. MacGillivray's Warbler (Oporornis tolmiei). Species Account Number 159. 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: http://bna.birds.cornell.edu/bna/
- Scott, V.E. and G.L. Crouch. 1987. Response of breeding birds to commerical clearcutting of aspen in southwestern Colorado. Res. Note RM-475. Fort Collins, CO: U.S.D.A. Forest Service, Rocky Mountain Forest and Range Experiment Station. 5 pp.
- U.S. Forest Service. 1991. Forest and rangeland birds of the United States: Natural history and habitat use. U.S. Department of Agriculture, Forest Service Agricultural Handbook 688. 625 pages.
- Zackheim, Karen, 1973?, Exhibit H: Wildlife Study. In Ash Grove Cement Co. files.
- Additional Sources of Information Related to "Birds"