Reptiles and amphibians in deep canyons : the Big Jacks and Little Jacks Creek drainages of Owyhee County, Idaho / [book]

Mark F. Gerber
1997 unpublished
24 r x50. 'Western Rattlesnake {Crotalus viridis) *Great Basin Gopher Snake {Pituophis catenifer) 'Western Yellow-bellied Racer (Coluber constrictor) 'Western Striped Whipsnake (Masticophis taeniatus) *Westem Ground Snake {Sonora semiannulata) *Night Snake (Hypsiglena torquata) 'Western Longnose Snake (Rhinocheilus lecontei) 'Western Terrestrial Garter Snake (Thamnophis elegans) Common Garter Snake (Thamnophis sirtalis) Rubber Boa (Charina bottae) Lizards: 'Longnose Leopard Lizard (Gambelia
more » ... izard (Gambelia wislizenii) *Westem WMptail (Cnemidophorus tigris) 'Desert Homed Lizard (Phrynosoma platyrhinos) * Short Homed Lizard (Phrynosoma douglassi) * Side-blotched Lizard (Uta stanshuriana) 'Western Fence Lizard (Sceloporus occidentalis) 'Sagebrush Lizard (Sceloporus graciosus) *Mojave Black-collared Lizard (Crotaphytus bicinctores) 'Western Sldnk (Eumeces skiltonianus) 12 Amphibians: *Pacific Treefrog {Pseudacris regilla) Spotted Frog {Rana pretiosa) Northern Leopard Frog {Rana pipiens) Western Toad (Bufo boreas) Woodhouse's Toad {Bufo woodhousei) Great Basin Spadefoot Toad {Spea intermontanus) Reptiles and amphibians potentially found in the study area represent 69% of the total species of reptiles and amphibians in Idaho. Additionally, Long-toed Salamanders (Ambystoma macrodactylum) could possibly be found in the study area because the salamander's range borders the study area, and habitat within the study area is similar to the preferred habitat of the salamander. As marked by an asterisk above, we found 17 of 19 potential reptile species during the course of the study. We found reptiles in all three of the regimes that we surveyed: canyon bottom, mid-slope, and rim. The rim and canyon bottom regimes contained the most reptiles; relatively few were seen in the mid-slope regime, especially during the hottest part of the summer (Fig. 7 ). Big Jacks Creek was surveyed using mainly standard drift fence arrays. The drift fence arrays were of two types, steel flashing and silt fence. Silt fence was set up to determine its effectiveness. Insufficient data was obtained to determine to what extent silt fence is effective. Lizards were seen climbing on the silt fence itself. Snakes have been observed using the upright posts to climb over the fence if the posts are placed too close to the fence (M. Gerber pers. obs.). We angled the uprights to eliminate the latter problem. Movement by reptiles in the trapping area was negligible, with very few being recaptured more than 50m from the original site of capture. We did capture an unusually high number of rattlesnakes in one array on the rim in the spring, but by mid summer we could only find one. This could be the result of a den in the vicinity of the array. Visual searches did not appear to be effective during this study. We found a limited number of species of reptiles using this method. The areas that were surveyed were very rocky, and although rocks were turned, there were many deep talus runs that enabled snakes to retreat far below the surface, thus limiting the habitat that was practical to survey using this method. Except for one Western Groundsnake population, all reptiles that were seen were active foraging, diurnal species such as Gopher snakes, Racers, Whipsnakes, and Western Terrestrial Garter snakes. We occasionally encountered Western Rattlesnakes, which are usually crepuscular but were found frequently during mid morning hours. Representatives of all nine species of lizards found in this study were found during visual searches. Most of the lizards were found on the canyon rim while lizards on the canyon bottom were second in abundance. Mojave Black-collared lizards and Longnose Leopard lizard were recorded as incidentals.
doi:10.5962/bhl.title.63559 fatcat:r7yahfxxnra37mt2oyc7wvagca