Skip to main content
Advanced Search

Filters: Date Range: {"choice":"day"} (X) > Tags: {"type":"USGS Scientific Topic Keyword"} (X)

4 results (12ms)   

View Results as: JSON ATOM CSV
thumbnail
Bathymetric, topographic, and grain-size data were collected from May 2013 to October 2016 along a 15-mi reach of the Colorado River in Glen Canyon National Recreation Area, Arizona by the U.S. Geological Survey Grand Canyon Monitoring and Research Center. The study reach is located from river miles -15 at the base of Glen Canyon Dam to 0 at Lees Ferry. Channel bathymetry was mapped using multibeam bathymetry collected in November 2014 and single beam bathymetry collected in February 2015, August 2015, February 2016, and June 2016. Subaerial topography was mapped using photogrammetry derived from aerial Imagery collected in May 2013 and ground-based total-stations collected in February 2015, October 2015, and October...
Tags: 1-m resolution, Arizona, Colorado River, DEM, Geography, All tags...
thumbnail
We used stable isotope analysis of nitrogen and carbon turtle epidermal samples to describe the trophic niche of the sampled sea turtle population by portraying δC as a habitat structure variable against δN as a resource gradient axis. We examined isotopic data for hawksbills (n = 64) and green turtles (n = 241) hand-captured across an 8-year time frame (2011-2019) to assess interspecific competition. We use statistical analysis to identify ontogenetic shifts associated with changes in trophic feeding to postulate changes to resource use. Our results indicate that stable environmental conditions around Buck Island Reef National Monument (BIRNM) allow for different trophic strategies across the two species with significantly...
thumbnail
This data release makes available three data tables supporting a spatiotemporal analysis of riverine conductivity and streamflow trends within the Delaware River Basin. The listed datasets include baseflow and total flow time series for selected gaged basins, watershed attributes, water quality information and trend analysis results.


    map background search result map search result map Channel mapping Glen Canyon Dam to Lees Ferry in Glen Canyon National Recreation Area, Arizona - Data Stable isotope signatures from green turtles and hawksbills at Buck Island Reef National Monument, U.S. Virgin Islands from 2012-2019 Data supporting a spatiotemporal trend analysis of specific conductivity, streamflow, and landscape attributes of selected sub-basins within the Delaware River watershed, 1980 to 2018 Survival of grass carp and black carp gavaged with an oral dose of antimycin A in two carriers, corn oil and ethanol Survival of grass carp and black carp gavaged with an oral dose of antimycin A in two carriers, corn oil and ethanol Data supporting a spatiotemporal trend analysis of specific conductivity, streamflow, and landscape attributes of selected sub-basins within the Delaware River watershed, 1980 to 2018