Skip to main content
Advanced Search

Filters: partyWithName: Western Ecological Research Center (X) > Types: OGC WFS Layer (X) > partyWithName: U.S. Geological Survey - ScienceBase (X) > Types: Shapefile (X)

22 results (11ms)   

View Results as: JSON ATOM CSV
thumbnail
The GIS shapefile Extra limit counts of southern sea otters 2019 is a point layer representing the locations of sea otter sightings that fall outside the officially recognized range of the southern sea otter (Enhydra lutris nereis) in mainland California. These data were collected during the spring 2019 range-wide census. The USGS range-wide sea otter census has been undertaken each year since 1982, using consistent methodology involving both ground-based and aerial-based counts. The spring census provides the primary basis for gauging population trends by State and Federal management agencies. Sea otter distribution in California (the mainland range) is considered to comprise a band of potential habitat stretching...
Observations (reduced to detected/not detected) of 45 vertebrate species (seven mammals, seven amphibians, and 31 reptiles) across Southern California pitfall sampling projects conducted between 1995 through 2015. Habitat patch locations of every pitfall sampling project presented in a shapefile. Habitat patches were measured based on the size when pitfall sampling began within each. Sampling projects within the same geographic area may have different sized patches based on date of project sampling and if patch erosion occurred. A matrix of whether each species was expected within each habitat patch's species pool based on range maps and published records is also included. These data support the following publication:...
thumbnail
This dataset contains data pertaining to ground surface cover in a 30 meter radius around a random selection of points within San Diego County, California. These data were obtained from aerial imagery for the years 1953 and 2016 and were used to assess changes in cover type over time. These data support the following publication: Syphard, A.D., Brennan, T.J. and Keeley, J.E., 2019. Extent and drivers of vegetation type conversion in Southern California chaparral. Ecosphere, 10(7), p.e02796.
thumbnail
This shapefile represents habitat suitability categories (High, Moderate, Low, and Non-Habitat) derived from a composite, continuous surface of sage-grouse habitat suitability index (HSI) values for northeastern California during the winter season (November to March), and is a surrogate for habitat conditions during periods of cold and snow.
thumbnail
This spreadsheet compiles all longitudinal survey data collected along Redwood Creek during the thirty year period, 1977-2007. Long-term surveys were conducted along three reaches of Redwood Creek: Elam to Hayes creek reach, Dolason to Wier (Emerald) creek reach, and Bond to 44 creek reach. Longitudinal streambed surveys follow the channel thalweg (deepest point) and are useful in documenting aquatic habitat conditions (for example, pool depth distribution, percent length in riffles vs pools). Each of these surveys was conducted in the summer months of each recorded year and took about two weeks to complete.
thumbnail
The GIS shapefile "Census summary of southern sea otter 2018" provides a standardized tool for examining spatial patterns in abundance and demographic trends of the southern sea otter (Enhydra lutris nereis), based on data collected during the spring 2018 range-wide census. The USGS spring range-wide sea otter census has been undertaken each year since 1982, using consistent methodology involving both ground-based and aerial-based counts. The spring census provides the primary basis for gauging population trends by State and Federal management agencies. This Shape file includes a series of summary statistics derived from the raw census data, including sea otter density (otters per square km of habitat), linear density...
thumbnail
The GIS shapefile Census_sum_2019 provides a standardized tool for examining spatial patterns in abundance and demographic trends of the southern sea otter (Enhydra lutris nereis), based on data collected during the spring 2019 range-wide census. The USGS spring range-wide sea otter census has been undertaken each year since 1982, using consistent methodology involving both ground-based and aerial-based counts. The spring census provides the primary basis for gauging population trends by State and Federal management agencies. This shapefile includes a series of summary statistics derived from the raw census data, including sea otter density (otters per square kilometer of habitat), linear density (otters per kilometer...
We assessed the impacts of co-occurring invasive plant species on fire regimes and postfire native communities in the Mojave Desert, western USA by analyzing the distribution and co-occurrence patterns of three invasive annual grasses known to alter fuel conditions and community structure: Red Brome (Bromus rubens), Cheatgrass (Bromus tectorum), and Mediterranean grass (Schismus spp.: Schismus arabicus and Schismus barbatus), and an invasive forb, red stemmed filaree (Erodium cicutarium) which can dominate postfire sites. We developed species distribution models (SDMs) for each of the four taxa and analyzed field plot data to assess the relationship between invasives and fire frequency, years postfire, and the impacts...
We used a stratified-random sampling approach to estimate the total abundance of Wedge-tailed Shearwater (Ardenna pacifica) nest sites across Kīlauea Point National Wildlife Refuge (KPNWR), Kauaʻi, during 1-7 July 2019. We first identified strata as unique geographic areas of the refuge to account for potential differences in nesting habitat and non-uniform nest site clustering. We then sub-divided strata where we expected high, low, minimal, or no nest site abundance. These distinctions were based on knowledge of shearwater nesting distribution gained while performing extensive ground-searching for tropicbirds across the entire refuge in April and May 2019. We delineated strata boundaries using recent satellite...
thumbnail
This shapefile represents proposed management categories (Core, Priority, General, and Non-Habitat) derived from the intersection of habitat suitability categories and lek space use. Habitat suitability categories were derived from a composite, continuous surface of sage-grouse habitat suitability index (HSI) values for northeastern California formed from the multiplicative product of the spring (mid-March to June), summer (July to mid-Octoer), and winter (November to March) HSI surfaces.
thumbnail
This data set compiles all cross-sectional survey data collected along Redwood Creek during the sixty year period, 1953-2013 (note that no surveys were conducted between 1954 and 1972). Cross-sectional surveys are transects perpendicular to channel flow and are used to document sedimentation and erosion (scour and fill) in river channel beds and on streambanks.
thumbnail
This raster dataset depicts percent canopy cover derived from 1-m conifer classifications. Conifer features were classified from 2010, 2012, and 2013 NAIP Digital Ortho Quarter Quads (DOQQ) using the Feature Analyst 5.0 extension for ArcGIS 10.1. Tiles were organized and grouped by Nevada Department of Wildlife Population Management Unit (PMU) locations, plus a 10 km area beyond the PMU extent. Analysts visually identified conifers in the imagery using false color infrared settings and digitized multiple trees per tile as training locations for classification. After performing hierarchical learning and clutter removal with Feature Analyst to remove non-conifer features on output shapefiles, the conifer polygons...
thumbnail
The GIS shapefile "Extra limit counts of southern sea otters 2018" is a point layer representing the locations of sea otter sightings that fall outside the officially recognized range of the southern sea otter (Enhydra lutris nereis) in mainland California. These data were collected during the spring 2018 range-wide census. The USGS range-wide sea otter census has been undertaken each year since 1982, using consistent methodology involving both ground-based and aerial-based counts. The spring census provides the primary basis for gauging population trends by State and Federal management agencies. Sea otter distribution in California (the mainland range) is considered to comprise a band of potential habitat stretching...
thumbnail
The GIS shapefile Range extent of southern sea otters 2019.shp is a simple polyline representing the geographic distribution of the southern sea otter (Enhydra lutris nereis) in mainland California, based on data collected during the spring 2019 range-wide census. The USGS range-wide sea otter census has been undertaken each year since 1982, using consistent methodology involving both ground-based and aerial-based counts. The spring provides the primary basis for gauging population trends by State and Federal management agencies. Sea otter distribution in California (the mainland range) is considered to comprise a band of potential habitat stretching along the coast of California, and bounded to the north and south...
thumbnail
This shapefile represents proposed management categories (Core, Priority, General, and Non-Habitat) derived from the intersection of habitat suitability categories and lek space use. Habitat suitability categories were derived from a composite, continuous surface of sage-grouse habitat suitability index (HSI) values for northeastern California formed from the multiplicative product of the spring (mid-March to June), summer (July to mid-October), and winter (November to March) HSI surfaces.
thumbnail
The Shasta salamander (Hydromantes shastae) has been petitioned for listing under the Endangered Species Act. The greatest threat to the species is likely habitat loss that will be caused by the increase in elevation of Shasta Lake that will occur with proposed increases in the height of Shasta Dam to increase water storage capacity and maintain cold water for Chinook salmon (Oncorhynchus tshawytscha). Another potential threat is the fungus Batrachochytrium salamandrivorans, which has not yet been detected in North America but is lethal to related salamanders (Hydromantes strinatii) in Europe (Martel et al. 2014). In addition to these threats, recent genetic evidence suggests that the species as originally petitioned...
thumbnail
This dataset contains data pertaining to vegetation type, woody versus herbaceous versus non-vegetated, for a random selection of points within the Santa Monica Mountains National Recreation Area of Southern California. These data were obtained from aerial imagery for the years 1947, 1977, 1995, 2005, and 2014 and were used to determine changes in cover type over time. These data support the following publication: Syphard, A.D., Brennan, T.J. and Keeley, J.E., 2018. Drivers of chaparral type conversion to herbaceous vegetation in coastal Southern California. Diversity and Distributions. https://doi.org/10.1111/ddi.12827
thumbnail
This shapefile represents habitat suitability categories (High, Moderate, Low, and Non-Habitat) derived from a composite, continuous surface of sage-grouse habitat suitability index (HSI) values for northeastern California formed from the multiplicative product of the spring (mid-March to June), summer (July to mid-October), and winter (November to March) HSI surfaces.
thumbnail
This shapefile represents habitat suitability categories (High, Moderate, Low, and Non-Habitat) derived from a composite, continuous surface of sage-grouse habitat suitability index (HSI) values for northeastern California during summer (July to mid-October)¸ which is a surrogate for habitat conditions during the sage-grouse brood-rearing period.
thumbnail
Dr. Richard Janda of the USGS began a channel monitoring program in Redwood Creek in northern coastal California in 1973. The USGS continued this work through 2013, when the Research Geologist, Dr. Mary Madej retired. This effort produced 40 years of channel change data in rivers that were disrupted by severe erosion following timber harvest of old-growth redwood forests, a portion of the program's data (plus 1953 data) has been preserved in this data release. Original field surveys documented bank erosion, aggradation, and degradation at 60 cross-sectional transects at annual or biannual timesteps. Three river reaches also have long-term longitudinal channel bed surveys which document the distribution and development...


map background search result map search result map River Channel Survey Data, Redwood Creek, California, 1953-2013 River Channel Survey Data, Redwood Creek, California, 1953-2013: Cross-Sectional Data River Channel Survey Data, Redwood Creek, California, 1977-2007: Longitudinal Profile Data Canopy cover classes of conifers within Nevada and northeastern California sage-grouse habitat, by quadrant (2017) Annual California Sea Otter Census: 2018 Census Summary Shapefile Annual California Sea Otter Census: 2018 Extra Limit Observations Shapefile Chaparral type conversion into herbaceous vegetation in coastal Southern California from 1947 to 2014, data compiled from aerial imagery, geographic NAD83 (2017) Composite Habitat Categories Shapfile Composite Management Categories Shapefile Spring Season Habitat Categories Shapefile Summer Season Habitat Categories Shapefile Winter Season Habitat Categories Shapefile Vegetation type conversion in chaparral in San Diego County, California, USA between 1953 and 2016 Annual California Sea Otter Census: 2019 Census Summary Shapefile Annual California Sea Otter Census: 2019 Extra Limit Observations Shapefile Annual California Sea Otter Census: 2019 Range Extent Shapefile Invasive Plant Cover in the Mojave Desert, 2009 - 2013 (ver. 2.0, April 2021) Shasta Salamanders Surveys for the Shasta-Trinity National Forest (ver. 2.0, July 2020) 6. Strata boundaries for nesting Wedge-tailed Shearwater (Ardenna pacifica) surveys at Kīlauea Point National Wildlife Refuge, Kauaʻi, in 2019 Species observations from pitfall trap arrays, species pool matrices, and patch locations in southern California from 1995-2015 Annual California Sea Otter Census: 2018 Extra Limit Observations Shapefile 6. Strata boundaries for nesting Wedge-tailed Shearwater (Ardenna pacifica) surveys at Kīlauea Point National Wildlife Refuge, Kauaʻi, in 2019 Chaparral type conversion into herbaceous vegetation in coastal Southern California from 1947 to 2014, data compiled from aerial imagery, geographic NAD83 (2017) River Channel Survey Data, Redwood Creek, California, 1953-2013 River Channel Survey Data, Redwood Creek, California, 1953-2013: Cross-Sectional Data River Channel Survey Data, Redwood Creek, California, 1977-2007: Longitudinal Profile Data Vegetation type conversion in chaparral in San Diego County, California, USA between 1953 and 2016 Winter Season Habitat Categories Shapefile Spring Season Habitat Categories Shapefile Composite Habitat Categories Shapfile Composite Management Categories Shapefile Summer Season Habitat Categories Shapefile Shasta Salamanders Surveys for the Shasta-Trinity National Forest (ver. 2.0, July 2020) Species observations from pitfall trap arrays, species pool matrices, and patch locations in southern California from 1995-2015 Annual California Sea Otter Census: 2019 Range Extent Shapefile Annual California Sea Otter Census: 2018 Census Summary Shapefile Annual California Sea Otter Census: 2019 Census Summary Shapefile Invasive Plant Cover in the Mojave Desert, 2009 - 2013 (ver. 2.0, April 2021) Canopy cover classes of conifers within Nevada and northeastern California sage-grouse habitat, by quadrant (2017)