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Kanab Ambersnail and Other Terrestrial Snails in South Central Utah

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Kanab Ambersnail and Other Terrestrial Snails in South Central Utah Western North American Naturalist Volume 62 Number 3 Article 6 7-30-2002 Kanab ambersnail and other terrestrial snails in south central Utah Vicky J. Meretsky Indiana University, Bloomington, Indiana Eric G. North Hayward, Wisconsin Lawrence E. Stevens Flagstaff, Arizona Follow this and additional works at: https://scholarsarchive.byu.edu/wnan Recommended Citation Meretsky, Vicky J.; North, Eric G.; and Stevens, Lawrence E. (2002) "Kanab ambersnail and other terrestrial snails in south central Utah," Western North American Naturalist: Vol. 62 : No. 3 , Article 6. Available at: https://scholarsarchive.byu.edu/wnan/vol62/iss3/6 This Article is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Western North American Naturalist by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. Western North American Naturalist 62(3), © 2002, pp. 307–315 KANAB AMBERSNAIL AND OTHER TERRESTRIAL SNAILS IN SOUTH CENTRAL UTAH Vicky J. Meretsky1, Eric G. North2, and Lawrence E. Stevens3 ABSTRACT.—Surveys for succineid snails were conducted to improve genetic and geographical information for the endangered Kanab ambersnail (Oxyloma haydeni kanabensis Pilsbry) and related taxa within the Succineidae. Surveys were carried out in the Bureau of Land Management Kanab District, at the Grand Staircase–Escalante National Monu- ment, on 3 private holdings, and along Highways 89, 12, and 14, all in south central Utah. A population of Kanab amber- snails was known to exist in the region; other populations of Oxyloma were discovered in primarily seep-fed wetlands in Kanab Creek and in tributaries of and wetlands along the Virgin, Sevier, and Escalante rivers in Kane, Garfield, and Piute counties. None of the newly discovered populations was identified as Kanab ambersnail on the basis of anatomical evidence, although one was at the type locale for that species. We list other snail species encountered and discuss the status of the Kanab ambersnail in light of recent genetic research. Key words: ambersnail, taxonomy, Colorado Plateau, Oxyloma, Succineidae. In North America succineid snails (Mollusca: Service 1992) after searches at the type local- Stylommatophora: Succineidae) are often, but ity in Kanab Canyon, near Kanab, Utah, located not invariably, terrestrial and are associated only 3 individuals (Clarke 1991) and the owner with a variety of wetland habitats. Although of the only other known site for the species (in they have been widely collected and described, Three Lakes Canyon also near Kanab) began identification of succineid specimens can be plans to develop the property. During the list- difficult, and taxonomy within Succineidae is ing process, a 3rd population was discovered in flux, owing, in some cases, to anatomical in Grand Canyon, Arizona (Spamer and Bogan similarity of species (e.g., Franzen 1981, 1985, 1993a, 1993b); all 3 populations were included Frest and Dickson 1986, Hoagland and Davis in the listing. Since listing, 2 additional popu- 1987, Miller et al. 2000, Stevens et al. 2001) lations of Oxyloma have been located in Grand and in other cases also to conflicting results Canyon (at Indian Gardens along South Bright from anatomical and genetic studies (Hoagland Angel Trail, and at 9-Mile Marsh along the and Davis 1987, Miller et al. 2000, Stevens et edge of the Colorado River); both were identi- al. 2001). New species descriptions and expan- fied on the basis of anatomy as O. h. haydeni sions of known ranges are ongoing in North Binney (Stevens et al. 1997, Miller et al. 2000). America (Harris and Hubricht 1982, Franzen In his reclassification of O. h. kanabensis 1983, 1985, Frest and Dickson 1986, Spamer (originally Succinea hawkinsi Baird), Pilsbry and Bogan 1993a, 1993b). Currently, 2 species (1948) indicated that the new subspecific sta- in the family (Kanab ambersnail, Oxyloma tus should be regarded as preliminary and that haydeni kanabensis Pilsbry, and the Chitte- full species status might be warranted. No fur- nango ovate ambersnail, Succinea chittenan- ther work on taxonomy of southwestern suc- goensis Pilsbry) are federally endangered. cineids was undertaken until after listing of In the southwestern U.S., succineid collec- the Kanab ambersnail. Results of preliminary tions are patchy (e.g., Ferriss 1910, Chamber- molecular taxonomic work with the Grand lin and Jones 1929, Baily and Baily 1952, Canyon O. h. haydeni and O. h. kanabensis pop- Bequaert and Miller 1973, Hovingh 1993, ulations and the remaining O. h. kanabensis Kerns 1993, Spamer and Bogan 1993a, 1993b). population on private land in southern Utah In 1992 the Kanab ambersnail was listed as were inconsistent with anatomical results federally endangered (U.S. Fish and Wildlife (Miller et al. 2000). Here we report on surveys 1Environmental Sciences, School of Public and Environmental Affairs, Indiana University, Bloomington, IN 47405. 211068 N. Risberg Road, Hayward, WI 54843. 3PO Box 1315, Flagstaff, AZ 86002. 307 308 WESTERN NORTH AMERICAN NATURALIST [Volume 62 undertaken to improve understanding of suc- Oxyloma there (Lunceford personal communi- cineid distribution in south central Utah and cation). Surveys along Highways 89 and 14 to provide specimens for further taxonomic were conducted where wetland vegetation study. could be reached in the public rights-of-way. In 1996 and 1998 we conducted surveys of MATERIALS AND METHODS Three Lakes; surveys in the remainder of Kane County and in Garfield County were conducted Surveys in 1999. Two sites, one in Piute County and We conducted surveys in the Bureau of the other in Garfield County (below the Burr Land Management’s (BLM) Kanab District; in Trail), were visited in 2000; Burr Trail speci- the Grand Staircase–Escalante National Mon- mens, which were collected after anatomical ument (also BLM land); and on private land in identifications had been completed, are iden- Three Lakes Canyon, in Kanab Canyon, and tified only to genus. All other Oxyloma were on The Nature Conservancy’s Autumn Butter- identified to species by Shi-Kuei Wu of Uni- cup Preserve in the Sevier drainage in Garfield versity of Colorado (no geographical informa- County. Additional public rights-of-way, all in tion was supplied so that identifications were south central Utah (Fig. 1), were also surveyed, purely on the basis of anatomy); Catinella i.e., along Highway 89 in the Sevier and Virgin were not identified with certainty and are drainages, along Highway 12 near the north- recorded only at the genus level; other snails ern boundary of the monument, and along the were identified by Eric North. Specimens east end of Highway 14. In all cases we briefly were archived at Northern Arizona Univer- described riparian and seep-fed wetlands and sity’s Laboratory of Quaternary Paleontology systematically searched them for live or recent- and at the Museum of Northern Arizona, both ly dead snails. Succineids from several sites in Flagstaff. were collected for genetic analysis reported Population Estimation elsewhere (Stevens et al. 2001). Survey of Kanab Canyon followed the Population estimation was undertaken at August 1998 discovery of an Oxyloma popula- Three Lakes, where the Kanab ambersnail was tion in the canyon containing the type locality known to be present, and in Kanab Canyon, of Kanab ambersnail (Meretsky and North the type locality for the Kanab ambersnail 2000). Survey efforts extended from the dam (although snails there were later identified by at the Kanab City Reservoir north to the con- anatomy as belonging to other taxa). Snails fluence with Red Canyon (a straight-line dis- were counted in haphazardly placed 20-cm- tance of 11.2 km) and included the area be- diameter circles in appropriate habitat; we lieved to be the type locality for O. h. kanabensis. dispersed samples throughout the habitat but Following discussions with BLM personnel did not grid the sites to allow true random and helicopter surveys of potential habitats for sampling. succineid snails, we determined survey loca- Habitat in Kanab Creek was too extensive tions in Grand Staircase–Escalante National to sample every patch; an initial estimate of Monument. Ground surveys were conducted snail density was constructed by sampling in primarily from Skutumpah Road, Highway 12, several different wetland patches, stratified by and Cottonwood Canyon Road. The monu- habitat type (e.g., wet meadow, cattail stand). ment contains many small patches (<< 100 m Using GPS equipment, we measured or sur- in any dimension) of potential habitat and con- veyed areas of habitat patches, categorized siderable fenced land; not all potential habitat them by habitat type, and calculated popula- was visited. Oxyloma specimens from one site tion estimates from the median densities of in Upper Valley died before being preserved the initial sample of similar wetlands. Final but we did not re-collect from the site as a estimates considered only snails ≥4 mm in sample was collected and successfully pre- length, as these were considered to be equally served from a nearby site along the same observable by all surveyors and in all habitats drainage. and to be somewhat more likely to survive to The Nature Conservancy’s Autumn Butter- adulthood (7 mm; Wu personal communication) cup Preserve, north of Panguitch in Garfield than smaller snails. Snails in streamside vege- County, was surveyed in response to reports of tation
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