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Male boreal toads (Bufo boreas) are thought to return to the breeding site every year but, if absent in a particular year, will be more likely to return the following year. Using Pollock's robust design we estimated temporary emigration (the probability a male toad is absent from a breeding site in a given year) at three locations in Colorado, USA: two in Rocky Mountain National Park and one in Chaffee County. We present data that suggest that not all male toads return to the breeding site every year. Our analyses indicate that temporary emigration varies by site and time (for example, from 1992 to 1998, the probability of temporary emigration ranged from 10% to 29% and from 3% to 95% at Lost Lake and Kettle Tarn,...
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This map contains:Aquatic Intactness results for the State of Utah and the Colorado Plateau Ecoregion, HUC6/12-Digit HUC resolution.Aquatic Species Intactness results clipped to 22 different species' distributions, showing the AI status/condition for each of these species of interest in Utah and the COP. An experimental Aquatic Intactness model for the Escalante subregion, which tests a methodology to incorporate detailed/specialized datasets available for only a portion of the study site into the model without penalizing no-data areas in the final intactness score. The Escalante experimental model utilizes two additional themes: riparian vegetation conversion and grazing impact. Unfortunately Grand Staircase National...
Population genetic structure of boreal toad (Bufo boreas boreas) in Utah: A basis for defining units of conservation, credited to Hogrefe, Todd C, published in 2001.
Two populations of boreal toads (Bufo boreas) experienced drastic declines in abundance in the late 1990s. Evidence supported the hypothesis of disease (the chytrid fungus, Batrachochytrium dendrobatidis) as the cause of these declines, but other hypotheses had not been evaluated. We used an 11-year capture-recapture data set to evaluate weather and disease as causes of these declines. We developed sets of mathematical models that reflected hypothesized relationships between several weather variables and annual survival rates of adult males in these populations. In addition, models that reflected the possibility that the declines were caused by an introduced fungus were developed. All models were fit to the data...
This dataset includes two files, 1) site -specific covariates including the presence of predators (fish), disease (Batrachochytrium dendrobatidis [Bd] - amphibian chytrid fungus), and permanence (ephemeral or permanent) of sites in Rocky Mountain National Park, Colorado. The dataset was analyzed for planned publication of a manuscript in Population Ecology, Crockett, J., E. Muths and L.L. Bailey authors. and 2) site-specific covariates for additional sites in Colorado (including those in file 1) noting the presence of toad breeding, snowpack values, Bd, permanence and elevation that are analyzed for a second planned publication by Crockett et al.
Determining the nature and extent of bufonid movements is critical to understanding the autecology of each species, as well as to developing effective conservation strategies. Within many toad (Bufo spp.) populations, individuals must migrate considerable distances to reach habitats essential for fulfilling requirements that change seasonally and ontogenically (deMaynadier and Hunter 2000; Sinsch 1990). Summer home range movements (sensu deMaynadier and Hunter 2000) are often necessary to allow individuals to meet multiple resource needs (e.g., food and thermoregulation sites; Zug et al. 2001). Documenting movement patterns helps biologists determine the nature, timing, spatial extent, and distribution of habitat...
Amphibian populations continue to be imperiled by the chytrid fungus (Batrachochytrium dendrobatidis). Understanding where B. dendrobatidis (Bd) occurs and how it may be limited by environmental factors is critical to our ability to effectively conserve the amphibians affected by Bd. We sampled 1247 amphibians (boreal toads and surrogates) at 261 boreal toad (Bufo boreas) breeding sites (97 clusters) along an 11� latitudinal gradient in the Rocky Mountains to determine the distribution of B. dendrobatidis and examine environmental factors, such as temperature and elevation, that might affect its distribution. The fungus was detected at 64% of all clusters and occurred across a range of elevations (1030?3550 m) and...
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Individual identification is required for investigations that examine population-level changes (e.g., decreased survival, increased disease prevalence) and the mechanisms associated with these changes in wild populations. Such identification generally requires the application of a unique mark, or the documentation of characteristics unique to each individual animal. Marking strategies that minimize handling time (representing stress), and thus minimize impacts to populations, are encouraged from scientific, as well as ethical, perspectives. We used passive integrated transponder (PIT) tagging and photography to individually identify Boreal toads (Anaxyrus boreas boreas) in Rocky Mountain National Park, Colorado...
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These capture-mark-recapture data for boreal toads are associated with the project that is abstracted below: Amphibian decline is a problem of global importance, with over 40% of species considered at risk. This phenomenon is not limited to the tropics or to other countries. Amphibian species in the U.S. are also declining, contributing to the larger, global phenomenon. For example, in the State of Wyoming, the Wyoming toad has been extirpated in the wild and the boreal toad is a species of special concern. Understanding biotic and abiotic factors that influence amphibian persistence is critical for amphibian conservation. This work in northern Wyoming has focused on demography, habitat alteration and creation,...
Categories: Data; Tags: Blackrock, Wyoming, biota, blackrock, boreal toad


    map background search result map search result map Capture-mark-recapture data for boreal toads at Blackrock, Wyoming 2003-2016 BLM REA COP 2014 UCS UTAH Aquatic Intactness  553395 Virgin River Chub Boreal toad metamorph capture, recapture and covariates data, Colorado 2017-2018 Handling times: tagging vs photos, Boreal toads in WY/CO 2020 Capture-mark-recapture data for boreal toads at Blackrock, Wyoming 2003-2016 Boreal toad metamorph capture, recapture and covariates data, Colorado 2017-2018 Handling times: tagging vs photos, Boreal toads in WY/CO 2020 BLM REA COP 2014 UCS UTAH Aquatic Intactness  553395 Virgin River Chub