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Montana Field Guide

Montana Field Guides

Pacific Fritillary - Boloria epithore


Global Rank: G5
State Rank: S5

Agency Status
USFWS:
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General Description
[From Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Glassberg 2001; Pyle 2002] Forewing 2.1-2.4 cm. Tip of forewing and hindwing evenly rounded. Uppersurface bright orange with black markings large on basal half of wing, small on outer half, hindwing without black border. Undersurface of hindwing mottled light purplish-brown with postbasal spot row yellow. Above and below on both wings, submarginal row of slightly darkened crescents pointing outward.

Phenology
One flight; mid-May to June in the Coast ranges, June to July inland, July to mid-August at higher elevations (Scott 1986). Late May to August (Glassberg 2001). Early May to mid-August in the Oregon Cascades, mid-June to late August in the Wallowa Mountains (Warren 2005); late March to late September in Oregon and Washington (Pyle 2002); early May to early September in British Columbia (Guppy and Shepard 2001).

Diagnostic Characteristics
Best determined by submarginal row of slightly darkened crescents pointing outward above and below on both wings (pointing inward for most other Boloria).

Species Range
Montana Range

Click the legend blocks above to view individual ranges.
 


Range Comments
Central British Columbia and southwestern Alberta south in the Cascades and Sierra Nevada to central Sierra Nevada, in the Rocky Mountains to central Idaho and western Montana; isolated population in southwestern Yukon (Scott 1986; Opler and Wright 1999; Glassberg 2001; Pyle 2002); to 2440 m elevation in Oregon (Warren 2005), 2170 m elevation in Washington and interior British Columbia (Guppy and Shepard 2001; Pyle 2002). In Montana, reported from all counties west of the continental divide, east to Hill and Blaine counties along the Canadian border (Kohler 1980; Stanford and Opler 1993). Common to abundant (Glassberg 2001).

Summary of Observations Submitted for Montana
Number of Observations: 1

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

Recency

 

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



Migration
Non-migratory.

Habitat
Openings in moist conifer forests, wet meadows, open slopes and hilltops, streamsides, logging roads, rural gardens (Scott 1986; Opler and Wright 1999; Pyle 2002; Warren 2005). In Glacier National Park, Montana reported from montane mesic meadows and above treeline in alpine terrain (Debinski 1993).

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: 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.

    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
Larval food plants include several species of Viola (Scott 1986; Warren 2005; James and Nunnallee 2011). Adults feed on flower nectar, including Anaphalis, Cirsium, Fragaria, Potentilla, Rubus, and Symphyotrichum (Pyle 2002; James and Nunnallee 2011).

Reproductive Characteristics
Females lay eggs haphazardly and singly on twigs, grass stems, and other inert surfaces, but rarely on host plant (Scott 1986; James and Nunnallee 2011). Eggs hatch in about 4-7 days, develp rapidly (17-18 days) from L1 instar to L4 instar, L4 instars feeds a few days then departs host plant to seek shelter in dead leaves; diapauses (overwinters) as L4 instar. Following termination of diapause in spring L4 develops to L5 instar in 7-24 days (depending on temperature), pupates about 9-12 days later. Larvae not gregarious, build no nest, nocturnal, rest on undersides of host plant leaves (Scott 1986; James and Nunnallee 2011). Males patrol throughout the day in moist meadows and woods in search of females (Scott 1975b, 1986; James and Nunnallee 2011).

References
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Citation for data on this website:
Pacific Fritillary — Boloria epithore.  Montana Field Guide.  .  Retrieved on , from