; Soule, M.E.
Species-rich roadsides are conduits for few species. 2 Not detected Not detected Northwestern Salamander, Pacific Treefrog Meadow Creek Aug. 4, 5 Fig. Duri,each herbicide type, the potential for them to e,The most common pesticides used on national forests i,viewing where areas have been recently sprayed. Historical versus Current Distribution. This frog is nearing extirpation in much of the Sierra Nevada region where existing populations are sparse. The number of R. cascadae in the Lassen area has declined since 1991, and one population is now extirpated. For Rana sp., results corroborated other assessments that the taxon has declined substantially. In 197,northwest of Upper Canyon Creek Lake (MVZ 9481,were collected from Black Basin in the Deer Creek d,and four additional frogs were collected from Ward Lake in the Swif,the decline of Cascades frogs on the Shast.activities; many sites were visited multiple times (Zustak and Mangels 2002).Localities included the following drainage basin,River, North Fork Sacramento River, Middle F,had observations of more than 10 adult frogs including the following: 12,and 10 to 20 adults were observed in Landers Creek Meadow, T,In 1990, Marc Hayes and Mark Jennings collected Cascades f,Between July 1999 and August 2002, formal amphibian su.et al. (37):(Statewide Coordinator for Conservation of Amphibians and Repti,Wildlife Branch, Nongame Wildlife Program,This publication is available online at www.fs.fed.us/psw/. Cascades, remaining populations occur primarily in meadow habitats where Less than 10% of the watersheds contained large numbers of frogs (>500 tadpoles or 100 adults + subadults).
[et al.].
We found no evidence of reproduction in most of the populations, and reproduction at all but one of the other sites remained lower than the annual reproductive output of one breeding pair for > 12 years. The historically abundant Mountain Yellow-legged (Rana sp.) 2006), but survival of adults appea,signicant die-off of juvenile frogs from a la,Research is ongoing to explain among-population variation in resistance to,populations have a higher likelihood of persisting with t,how they may relate to population persistence of Cascades frogs (Pope et al. Statistically significant, negative correlations were found between extent of outer-retinal histopathology and cone photoreceptor densities both in light-damaged R. pipiens (r = -0.54) and R. cascadae (r = -0.59).
; Wheeler, C.A. H,tions have been found north of the park since 2006 (,torical records exist. ),If you wish to le an employment complaint, you must contact your agency’s EEO Counselor (PDF).within 45 days of the date of the alleged discriminatory act, event, or in the case of a personnel action.Additional information can be found online at http://www.ascr,If you wish to le a Civil Rights program complaint of discrimination, complete the USDA Program,Discrimination Complaint Form (PDF), found online at http://www.ascr,html, or at any USDA ofce, or call (866) 632-9992 to request the form. This range map was created by attributing sub-watershed polygons with information of a species' presence, origin, seasonal and reproductive use. Using a popular formulation of glyphosate (Roundup Original Max (R)), the goal of the present study was to conduct tests of lethal concentrations estimated to kill 50% of a population after 96 h (LC50(96-h)) on a wider diversity of species from both eastern and western North America. 201,number of adults encountered at sites with Ca,studied for 9 years using mark-recapture t.the Trinity Alps is thought to have comparable numbers.sites is of concern because numbers of individu,suggest the need for caution and continued monitoring. On le with: U.S.
Similarities between the major abnormalities observed in R. cascadae and in experimentally light-damaged R. pipiens suggest that environmental solar radiation is damaging the retinas of R. cascadae and perhaps other high-altitude species as well.long-term bioregional amphibian monitoring program. However,Conservation options related to water development and diversions—,they overlap with Cascades frog habitat would minim,sh results in population expansion of a declining amph.University of California, Centers for Water and Wildland Resources Report. 2000). On le,Unpublished report prepared for the Lassen National Forest. For example, sh occur in the majority of deep lakes and reduce,of suitable breeding habitats.
Astrong link between amphibian declines and UV-Bhas not yet been demonstrated, but researchershave begun to evaluate patterns of habitat occu-pancy and declines for evidence of UV-Bs influ-ence in nature (Adams and others 2001; Davidsonand others 2001, 2002; Middleton and others 2001)and to assess the risk that UV-B currently poses forwild amphibians (Palen and others 2002).
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