A5082498493- Wildlife Ecology and Conservation
- Avian ecology and behavior
- Species Distribution and Climate Change
- Ecology and Vegetation Dynamics Studies
- Wildlife-Road Interactions and Conservation
- Turtle Biology and Conservation
- Archaeological Research and Protection
- Karst Systems and Hydrogeology
- Image Processing and 3D Reconstruction
- Groundwater and Watershed Analysis
- Groundwater and Isotope Geochemistry
- Archaeology and ancient environmental studies
- Animal Behavior and Welfare Studies
National Park Service
2019
Crow Canyon Archaeological Center
2019
United States Geological Survey
2013-2018
Southwest Biological Science Center
2013-2018
Astrogeology Science Center
2013-2017
While demographic changes in short-lived species may be observed relatively quickly response to climate changes, measuring population responses of long-lived requires long-term studies that are not always available. We analyzed data from a threatened Agassiz's desert tortoises (Gopherus agassizii) at 2.59 km2 study plot the Sonoran Desert ecosystem Joshua Tree National Park, California, USA 1978 2012 examine variation apparent survival and demography this species. Transect-based,...
The accuracy of global positioning system (GPS) locations obtained from study animals tagged with GPS monitoring devices has been a concern as to the degree it influences assessments movement patterns, space use, and resource selection estimates. Many methods have proposed for screening data retain most accurate positions analysis, based on dilution precision (DOP) measures, whether position is two dimensional or three fix. Here we further explore utility these by testing Telonics GEN3...
Topographic measures are frequently used in a variety of landscape ecology applications, their simplest form as elevation, slope, and aspect, but increasingly more complex being employed.We explore terrain metric similarity with changes scale, both grain extent, examine how selecting the best is sensitive to application.There three types topographic measures: 1) those that relate orientation for approximating solar input, 2) capture variability configuration, 3) provide metrics about...
ABSTRACT Studies using global positioning system (GPS) telemetry rarely result in 100% fix success rates (FSR), which may bias datasets because data loss is systematic rather than a random process. Previous spatially explicit models developed to correct for sampling have been limited small study areas, range of loss, or were study‐area specific. We modeled environmental effects on FSR from desert alpine biomes, investigated the full potential (0–100% FSR), and evaluated whether animal body...
To prioritize archaeological site inventory and protection at Glen Canyon National Recreation Area (Glen NRA), predictive probability models were developed using the Random Forests machine learning method. NRA consists of approximately 5,000 km2 in Arizona Utah containing evidence multiple prehistoric cultures spanning least 10,000 years. Large portions have never been inventoried for resources. Archaeological sites are potentially subject to irreparable damage along roads receding Lake...