Skip to main content
Advanced Search

Filters: Tags: california condor (X)

11 results (53ms)   

View Results as: JSON ATOM CSV
Species reintroduction programmes, in prioritizing areas for reintroductions, have traditionally used tools that include measures of habitat suitability and evaluations of area requirements for viable populations. Here we add two tools to this approach: evaluation of ecological requirements of species and evaluation of future suitability for species facing changing climates. We demonstrate this approach with two species for which reintroduction programmes are in the planning stages in Mexico: California condor Gymnogyps californianus and Mexican wolf Canis lupus baileyi. For the condor, we identify three areas clustered in the Sierra San Pedro Martir, Baja California; for the wolf, we identify a string of suitable...
thumbnail
The dataset includes specifics on liver tissue and blood plasma anticoagulant rodenticide concentrations measured using high-performance liquid chromatography-tandem mass spectrometry. This data release supersedes Herring, G., and Eagles-Smith, C.A., 2022, Anticoagulant rodenticide concentrations in blood and tissue of California condors and turkey vultures: U.S. Geological Survey data release, https://doi.org/10.5066/P9NHPLHX. Please contact fresc_outreach@usgs.gov for access.
thumbnail
This dataset depicts areas designated as condor habitat.
A study of 72 historical and recent nests of the California Condor (Gymnogyps californianus) has revealed considerable variability in nest-site characteristics. This paper primarily summarizes the data on nest elevations and dimensions, entrance orientations, nest longevity and re-use, vulnerability of sites to natural enemies, and use of sites by other species. Although all known nests have been natural cavities, some have been little more than overhung ledges on cliffs, while others have been deep, dark caves with nest chambers completely concealed from the outside. Two sites have been cavities in giant sequoias (Sequoiadendron giganteurn). Contrary to previous assumptions, condors do modify the characteristics...
The Commission on Environmental Cooperation, in concert with a trinational group of experts, has identified North American species of common conservation concern (SCCC). These terrestrial and marine species comprise a group of important migratory, transboundary and endemic species selected from among the continent’s great wealth of wild flora and fauna, which require regional cooperation for their effective conservation.
thumbnail
This dataset represents current terrestrial intactness values (estimated at the 1km level) within the modeled distribution of the California Condor (Gymnogyps californianus). Terrestrial intactness is high in areas where development is low, vegetation intactness is high, and fragmentation is low. Consequently, this dataset serves as a general* indication of habitat quality within the distribution of this conservation element.Estimates of current terrestrial intactness were generated by an EEMS fuzzy logic model that integrates multiple measures of landscape development and vegetation intactness, including agriculture development (from LANDFIRE EVT v1.1), urban development (from LANDFIRE EVT v1.1 and NLCD Impervious...
Survival or extinction of an endangered species is inherently stochastic. We develop statistical methods for estimating quantities related to growth rates and extinction probabilities from time series data on the abundance of a single population. The statistical methods are based on a stochastic model of exponential growth arising from the biological theory of age or stagestructured populations. The model incorporates the socalled environmental type of stochastic fluctuations and yields a lognormal probability distribution of population abundance. Calculation of maximum likelihood estimates of the two unknown parameters in this model reduces to performing a simple linear regression. We describe techniques for rigorously...
The scientific evidence that California condors (Gymnogyps californianus) are frequently sickened and killed by lead poisoning from spent ammunition supports the conclusion that current levels of lead exposure are too high to allow reintroduced condors to develop self-sustaining populations in the wild in Arizona and, by inference, in California. The evidence for lead poisoning and its source comes from the following sorts of data: 1) 18 clinical necropsies revealing high levels of lead in body tissues and (or) presence of lead shotgun pellets and bullet fragments in digestive tracts; 2) moribund condors showing crop paralysis and impending starvation with toxic levels of lead in their blood; 3) widespread lead...
thumbnail
DRECP draft species model for California Condor. This dataset was created by buffering known condor locations from 2011-2013 by 20 km and clipping this output to the DRECP 12km buffer dataset.Telemetry data was provided by Laura Mendenhall and Matthew Johnson via the U.S. Fish and Wildlife Service. These data should be used only illustrate where condors are known to have visited, and not to illustrate where condors do not exist. Note, more detailed information on condor modeling is being carried out by the California Condor Wind Energy Work Group.
thumbnail
-Test subject identification information (sample collection site and date, test subject identification number, and sample number) -Clotting time parameters and comments (prothrombin time, Russell’s viper venom time, fibrinogen concentration, and coefficient of variation for replicate analyses)
    map background search result map search result map California Condor - Habitat Intactness, DRECP California Condor - Species Distribution Model, DRECP California (USA) Condor Habitat Assessing Exposure, Physiological Effects, and Geographic Scope of Anticoagulant Rodenticides in the Critically Endangered California Condor Anticoagulant rodenticide concentrations in blood and tissue of California condors and turkey vultures (ver. 2.0, May 2023) Assessing Exposure, Physiological Effects, and Geographic Scope of Anticoagulant Rodenticides in the Critically Endangered California Condor California (USA) Condor Habitat California Condor - Habitat Intactness, DRECP California Condor - Species Distribution Model, DRECP Anticoagulant rodenticide concentrations in blood and tissue of California condors and turkey vultures (ver. 2.0, May 2023)