Land mollusk surveys on USFS Northern Region lands: 2006

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Using published reports and the NatureServe web site as starting points, the authors compiled a list of 29 snail taxa within the U.S. Forest Service Northern Region (Region 1) area globally ranked in 2005 as G1G3 or T1T3, thereby meeting USFS Species of Concern (SOC) criteria, and two additional G5 snail taxa state ranked S1S2, thereby meeting USFS Species of Interest (SOI) criteria. They also compiled a list of eight slug taxa ranked in 2005 as G1G3, and three additional slug taxa ranked G4G5 but S1S2, again meeting the respective USFS criteria for SOC or SOI. A total of 156 site surveys were conducted across National Forest units in Montana in 2006, primarily targeting areas lacking prior surveys. SOC and/or SOI taxa were found at 49 (31.4%) of the sites. Site surveys were distributed on the Montana Forests as follows: Beaverhead-Deerlodge (14), Bitterroot (18), Custer (36), Flathead (15), Gallatin (9), Helena (15), Kootenai (24), Lewis & Clark (8), and Lolo (17). Documented were 106 locations for eight USFS Region 1 SOC taxa and five SOI taxa during our 2006 surveys: Striate Disc (Discus shimekii) (2 sites), Berry’s Mountainsnail (Oreohelix strigose berryi) (1 site), Robust Lancetooth (Haplotrema vancouverense) (9 sites), Humped Coin (Polygyrella polygyrella) (5 sites), Fir Pinwheel (Radiodiscus abietum) (25 sites), Pale Jumping-slug (Hemphillia camelus) (2 sites), Marbled Jumping-Slug (Hemphillia danielsi) (5 sites), Magnum antleslug (Magnipelta mycophaga) (4 sites), Pygmy Slug (Kootenaia burkei) (7 sites), Reticulate Taildropper (Prophysaon andersoni) (1 site), Smoky Taildropper (Prophysaon humile) (24 sites), Lyre Mantleslug (Udosarx lyrata) (2 sites), and Sheathed Slug (Zacoleus idahoensis) (20 sites). Most locations are from west of the Continental Divide in mesic forest habitats (e.g., western redcedar, western hemlock, mesic Douglas-fi r, grand fi r). Distribution maps showing locations for all terrestrial mollusk taxa can be viewed at the Montana Natural Heritage Program Tracker website http://mtnhp.org/Tracker. In 2006, the authors collected additional location data for two SOC and one SOI slug species new in 2005 to the known mollusk fauna of Montana: Pale Jumping-slug, Pygmy Slug, and Reticulate Taildropper. The 2006 survey also added several new Montana locations for a third SOC slug species, Smoky Taildropper, which was documented in Montana only once prior to 2004. As a result of the 2005 surveys, Global Ranks shifted downward for five species (Humped Coin, Fir Pinwheel, Pale Jumping-slug, Pygmy Slug,and Smoky Taildropper). Additional Global and State Rank adjustments may be warranted following the results of the 2006 survey effort. Distribution data was collected on 31 additional non-SOC/SOI species as they were encountered during the surveys, including one species, Boreal Top (Zoogenetes harpa), new to the known terrestrial mollusk fauna of the state.

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ELECTRONIC FILE - Zoology: Invertebrates

Suggested citation: Hendricks, P., B. A. Maxell, S. Lenard and C. Currier. 2007. Land Mollusk Surveys on USFS Northern Region Lands: 2006. Report to the USDA Forest Service, Northern Region. Montana
Natural Heritage Program, Helena, Montana 11 pp. plus appendices.

SWAP (2/19/16) citation:
Hendricks P, Maxell BA, Lenard S, Currier C. 2007. Land mollusk surveys on USFS Northern Region lands: 2006. Helena (MT): Montana Natural Heritage Program. 11 p. Report prepared for US Forest Service, Northern Region. Agreement No.: 05-CS-11015600-033. [accessed 2016 Jan 21]. http://mtnhp.org/reports/USFS_Mollusc_2006.pdf.

Note: URL in SWAP citation no longer works (4/25/16).