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766 record(s) found.

Papers & Reports Iteroparity in the variable environment of the salamander Ambystoma tigrinum.
Authors: D R Church; Larissa L Bailey; H M Wilbur; W L Kendall; J E Hines
Date: 2007 | Outlet: Ecology 88: 891-903
Papers & Reports Diet and Foraging of Rana sauteri and Bufo bankorensis Tadpoles in Subtropical Taiwanese Streams
Authors: H Chen; B Lai; Gary M Fellers; W Wang; Y C Kam
Date: 2008 | Outlet: Zoological Studies 47: 685-696
Papers & Reports Demography and movement in a relocated population of Oregon Spotted Frogs (Rana pretiosa): influence of season and gender
Authors: N D Chelgren; Chris A Pearl; Michael J Adams; Jay Bowerman
Date: 2008-12-18 | Outlet: Copeia 2008: 742-751
Translocation, repatriation and relocation of wildlife are increasingly considered as methods in the management of imperiled wildlife populations. Yet, few such efforts have been studied in sufficient detail to understand demographic responses within specific life stages. We used five years of recapture data and Bayesian estimation to assess seasonal survival, movement and growth of Oregon Spotted Frogs (Rana pretiosa) relocated into created ponds at Dilman Meadow in Oregon, USA. We evaluate hypotheses specific to the relocation and elucidate aspects of R. pretiosa life history that are poorly known. The odds of survival of relocated individuals during the first year following relocation were 0.36 times the survival odds of relocated and non-relocated frogs after one year since the relocation. Survival rate was higher for large frogs. After accounting for frog size, we found little variation in survival between ponds at Dilman Meadow. Survival was lowest for males during the breeding/post-breeding redistribution period, suggesting a high cost of breeding for males. The highest survival rates occurred during winter for both genders, and one small spring was used heavily during winter but was used rarely during the rest of the year. Individual growth was higher in ponds that were not used for breeding, and increased with increasing pond age. Our study supports other evidence that R. pretiosa use different habitats seasonally and are specific in their overwintering habitat requirements. Because frogs were concentrated during winter, predator-free overwintering springs are likely to be of particular value for R. pretiosa populations.
Papers & Reports Hemidactylium scutatum (four-toed salamander): morphology/phenology
Authors: R J Chalmers; C S Loftin
Date: 2006 | Outlet: Herpetological Review 37: 69-71
Papers & Reports Wetland and microhabitat use by nesting four-toed salamanders in Maine
Authors: R J Chalmers; C S Loftin
Date: 2006 | Outlet: Journal of Herpetology 40: 478-485
Papers & Reports Measuring and predicting species presence – Coastal sage scrub case study
Authors: T J Case; Robert N Fisher
Date: 2001 | Outlet: Hunsaker C, Goodchild M, Friedl M, Case TJ, editors. Spatial uncertainty in ecology – Implications for remote sensing and GIS applications. New York, Springer-Verlag 47-71
Papers & Reports Taricha torosa torosa (Coast Range Newt) – Overwintering larvae
Authors: S L Carroll; Edward L Ervin; Robert N Fisher
Date: 2005 | Outlet: Herpetological Review 36: 297
Papers & Reports Conservation genetics of the endangered Shenandoah salamander (Plethodon shenandoah, Plethodontidae).
Authors: D W Carpenter; R E Jung; J W Sites
Date: 2001 | Outlet: Animal Conservation 4: 111-119
Papers & Reports Factors limiting the recovery of boreal toads (Bufo b. boreas)
Authors: C Carey; P S Corn; M S Jones; L J Livo; Erin Muths; C W Loeffler
Date: 2005 | Outlet: Lannoo M, editor. Amphibian declines: the conservation status of United States species. Berkeley: University of California Press 222–236
Book chapter that discusses specific limitations to the recovery of boreal toads from population declines in Colorado.
Papers & Reports Impacts of weathered tire debris on the development of Rana sylvatica larvae
Authors: K M Camponelli; R E Casey; J W Snodgrass; S M Lev; E R Landa
Date: 2009 | Outlet: Chemosphere 75(5): 717-722
Papers & Reports Sensitivity to acidification of subalpine ponds and lakes in northwestern Colorado
Authors: D H Campbell; Erin Muths; J T Turk; P S Corn
Date: 2004 | Outlet: Hydrological Processes 18: 2817–2834
The chemical composition of 97 lakes and ponds in and near the Mount Zirkel Wilderness Area (MZWA) was studied during snowmelt of 1998 and 1999 to determine the magnitude of episodic acidification and the effects of acidification on amphibian reproductive success. Within the areas identified as sensitive to acidification based on granitic bedrock types, there was substantial variability in ANC that was likely related to differences in hydrologic flowpaths that control delivery of weathering products to surface waters. Many of the lakes are sensitive to acidification (summer and fall ANC< 100 eq/l), however, none of them appeared to be immediately threatened by episodic or chronic acidification. 22 ponds had minimum ANC of < 30 ueq/l, indicating that they are extremely sensitive to acidic deposition, however net acidity (ANC < 0) was not measured in any of the ponds. The lowest measured pH value was 5.4 and pH generally remained less than 6.0 throughout early summer in the most sensitive ponds, indicating that biological effects of acidification are possible at levels of atmospheric deposition measured during the study.
Papers & Reports Clutch sizes and nests of tailed frogs from the Olympic Peninsula, Washington
Authors: R B Bury; P Loafman; D Rofkar; K I Mike
Date: 2001 | Outlet: Northwest Science 75: 419-422
Papers & Reports Potential causes for amphibian declines in Puerto Rico
Authors: P A Burrowes; R J Joglar; D E Green
Date: 2004 | Outlet: Herpetologica 60: 141-154
Papers & Reports Spatial and temporal variability in the amount and source of dissolved organic carbon: implications for UV exposure in amphibian habitats
Authors: Paul D Brooks; C M O’Reilly; S Diamond; D H Campbell; R A Knapp; David F Bradford; P S Corn; Blake R Hossack; K A Tonnessen
Date: 2005 | Outlet: Ecosystems 8: 478–487
The amount, chemical composition, and source of dissolved organic carbon (DOC), together with in situ ultraviolet (UV-B) attenuation, were measured at 1–2 week intervals throughout the summers of 1999, 2000, and 2001 at four sites in Rocky Mountain National Park (Colorado). Eight additional sites, four in Sequoia and Kings Canyon National Park/John Muir Wilderness (California)and four in Glacier National Park (Montana), were sampled during the summer of 2000.
Papers & Reports Toxicity to amphibians of environmental extracts from natural waters in National Parks and Fish and Wildlife Refuges
Authors: C M Bridges; E E Little
Date: 2005 | Outlet: Alytes 33: 130-145
Papers & Reports Responses of small terrestrial vertebrates to roads in a coastal sage scrub ecosystem
Authors: Cheryl S Brehme
Date: 2003 | Outlet: San Diego, CA: San Diego State University
Papers & Reports Physical stressors
Authors: Michelle D Boone; P S Corn; M A Donnelly; E E Little; P H Niewiarowski
Date: 2003 | Outlet: Linder G, Krest SK, Sparling DW, editors. Amphibian decline: an integrated analysis of multiple stressor effects. Pensacola, FL: Society of Environmental Toxicology and Chemistry 129–151
Our objectives in this chapter are to 1) review current information on physical stressors on amphibian population declines, 2)address the roles that changes in the physical environment could play in amphibian declines, 3) make predictions about the effects of physical stressors, and 4) determine what information is needed to evaluate the effects of physical stressors on amphibian populations.
Papers & Reports Attempted predation of CouchNULLs spadefoot (Scaphiopus couchii) juveniles by ants (Aphaenogaster cockerelli).
Authors: Kevin E Bonine; G H Dayton; R E Jung
Date: 2001 | Outlet: The Southwestern Naturalist 46: 104-106
Papers & Reports Physical Habitat and its Alteration: A Common Ground for Exposure of Amphibians to Environmental Stressors
Authors: Christine A Bishop; D C Cunnington; Gary M Fellers; J P Gibbs; B D Pauli; Betsie B Rothermel
Date: 2003 | Outlet: Linder G, Krest SK, Sparling DW, editors. Amphibian decline: an integrated analysis of multiple stressor effects. Pensacola, FL: Society of Environmental Toxicology and Chemistry 209-241
Papers & Reports The occurrence of glyphosate, atrazine, and other pesticides in vernal pools and adjacent streams in Washington, DC, Maryland, Iowa, and Wyoming, 2005-2006
Authors: William A Battaglin; Karen C Rice; M J Focazio; S Salmons; Robert X Barry
Date: 2008 | Outlet: Environmental Monitoring and Assessment 155: 281-307
Vernal pools are sensitive environments that provide critical habitats for many species, including amphibians. In 2005 and 2006, water samples were collected from vernal pools and adjacent flowing waters in Parks in Iowa, Washington, D.C., and Maryland, prior to and just after the local use of glyphosate. Results indicate that vernal pools and adjacent streams can be contaminated by the use of herbicides within Parks to control weeds in cropped areas or noxious or nonindigenous plants. Contamination also originates from pesticide use occurring outside Park boundaries.