Filters: Tags: ecoregions (X)
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The Yukon River Lowlands, Kuskokwim Mountains, and Lime Hills were selected by BLM for a Rapid Ecoregional Assessment (REA). These three ecoregions form the basis for the REA study area and were derived from the Unified Ecoregions of Alaska (Nowacki et al. 2001). Major ecosystems have been mapped and described for the State of Alaska and nearby areas. Ecoregion units are based on newly available datasets and field experience of ecologists, biologists, geologists and regional experts. Recently derived datasets for Alaska included climate parameters, vegetation, surficial geology and topography. Additional datasets incorporated in the mapping process were lithology, soils, permafrost, hydrography, fire regime and...
**Symbology has been adjusted by the Open Space Institute from The Nature Conservancy's original "Geophysical Settings, 2016 Eastern U.S. and Canada" dataset.** The geophysical settings are defined by their physical properties – geology, soil, and elevation - that correspond to differences in the flora and fauna they support. They also differ in ecological character, in their value for agriculture or mining, and how they have been developed by people. For example, the region’s high granite mountains are both largely intact and topographically complex, whereas low coastal sandplains are both more fragmented and relatively flat. The geophyical settings classification enabled us to compare resilience characteristics...
Categories: Data;
Types: ArcGIS REST Map Service,
ArcGIS Service Definition,
Downloadable,
Map Service;
Tags: Ecoregions,
Elevation,
Geology,
Geophysical Settings,
Resilience,
Ecoregion boundaries for the eastern United States, with extension into Canada for NAP and STL ecoregions. TNC Eastern Conservation Science based the boundaries on USFS Ecological Units of the Eastern United States 1st Approximation (Keys et al. 1995) subsections, Natural Heritage Program data, and ecoregions and subregions of Canada's provincial Ecological Land Classifications.
Tags: ecoregions
Ecoregions are based on perceived patterns of a combination of causal and integrative factors including land use, land surface form, potential natural vegetation, and soils (Omernik, 1987).
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Aquatic,
Conterminous,
Ecoregion,
Ecoregions,
Omernik,
Percent land area formally protected, by terrestrial ecoregion. We derived estimates of protected area coverage from the World Database of Protected Areas (WDPA, UNEP/IUCN 2007) with supplements for the United States (CBI 2006) and Australia (CAPAD 2006). The WDPA is the most comprehensive global catalog of protected areas and includes data about their sizes, locations, and IUCN classifications of management designation. The WDPA was assembled by a broad alliance of organizations that aimed to maintain a freely available, accurate, and current database that is accepted as a global standard by all stakeholders. The distribution of all protected areas was mapped in a Geographic Information System and then summarized...
Accessibility of natural habitats to humans, by terrestrial ecoregion. The human accessibility map provides an index of the level of effort it would take for a human on foot to access any given square kilometer of nonconverted land from existing infrastructure. We calculated human accessibility from a one-square-kilometer spatial grid of the terrestrial world consisting of a cost surface where the value of each cell was derived from topographic slope, vegetation type, and vegetation density. We developed a second matching spatial grid of infrastructure, depicting roads, railroads, navigable rivers, cities, and towns. Then we calculated a least cost path from each noninfrastructure grid cell to infrastructure grid...
Habitat loss and fragmentation is the most important factor in the loss of native biodiversity and ecological function of forested ecosystems. Using primarily Landsat TM based NLCD (National Land Cover Data) information on 1:100,000 scale USGS road data sets, we assessed relative forest intactness for 39 forested ecoregions of the conterminous United States. Forest intactness was mapped according to landunits that were defined by major highways and urban areas that contained more than 50,000 people. For each landunit, road density was calculated to create an overall relative forest intactness score. By assigning all dataset, this study 1) identified remaining relatively intact forest 2) identified landunits that...
In 2013, the first of several Regional Stream Quality Assessments (RSQA) was done in the Midwest United States. The Midwest Stream Quality Assessment (MSQA) was a collaborative study by the U.S. Geological Survey (USGS) National Water Quality Assessment (NAWQA), the USGS Columbia Environmental Research Center, and the U.S. Environmental Protection Agency (USEPA) National Rivers and Streams Assessment (NRSA). One of the objectives of the RSQA, and thus the MSQA, is to characterize the relationships between water-quality stressors and stream ecology and to determine the relative effects of these stressors on aquatic biota within the streams (U.S. Geological Survey, 2012). To meet this objective, a framework of fundamental...
Categories: Data;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Ecoregions,
Geographic Information Systems,
Geospatial Analysis,
Geospatial Datasets,
Illinois,
Categories: Project;
Tags: 2011,
Alaska-British Columbia Coast,
Alaska-British Columbia Mountains,
Klamath-Olympic-Cascade Mountains,
NPLCC,
This data release provides output produced by a statistical, aridity threshold fire model for 11 extensively forested ecoregions in the western United States. We identified thresholds in fire-season climate water deficit (FSCWD) that distinguish years with limited, moderate, and extensive area burned for each ecoregion. We developed a new area burned model using these relationships and used it to simulate annual area burned using historical climate from 1980 - 2020 and output from global climate models (GCMs) from 1980 - 2099. The data release includes a comparison of mean annual FSCWD for 13 GCMs that we used to select five GCMs that bracket the range of conditions projected for the RCP 8.5 emissions scenario....
This data set shows Level I, II, and III ecological regions (ecoregions) of North America, and is an update and revision of files developed by Canada, Mexico, and the United States of America in the late 1990’s in a cooperative project for the Commission for Environmental Cooperation (CEC). These revised ecological regions were developed in a meeting between representatives of the three nations and CEC in April 2006 in Newport, Oregon. Ecoregions are areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. The ecoregions in this data set are based on the premise that a hierarchy of ecological regions can be identified through the analysis of the patterns and...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Ecoregions,
Ecosystem geography ,
Ecosystems,
Regional ecology
This map shows the location of EPA Level IV Ecoregions in the Colorado Plateau Ecoregion.
Categories: Data,
Map;
Types: ArcGIS REST Map Service,
Map Service;
Tags: Colorado Plateau,
Ecoregions
This map depicts the density of "More Resilient" cells (defined as the top two quintiles from the stratified resilience dataset) within a 3-km radius of every cell. This provides important additional context when making land protection or restoration decisions. Cells with higher density values are embedded in a larger resilient landscape. These areas are more likely to support biodiversity and ecological function over time in a changing climate. To quantify resilience at the landscape scale, we used a density function, where all cells classified in the final top two resilience quintiles were included in the density calculations, regardless of their underlying Ecofacet, and all other cells were ignored. Looking...
Number of harmful species that have invaded freshwater habitats, by freshwater ecoregion. The occurrence and ecological impact for freshwater invasive species were compiled in a geographically referenced database according to the methods of Molnar et al. (2008). Information about 550 species was systematically collected from a wide variety of global, regional, national, and subnational data sources. Non-native distributions were documented by freshwater ecoregion. The threat of each species to native biodiversity was scored using the following categories: 4, disrupts entire ecosystem processes with wider abiotic influences; 3, disrupts multiple species, some wider ecosystem function, and/or keystone species or...
Percent of ecoregion area that is arable and not yet converted. We developed the map of arable land not yet converted to agriculture from data provided by Fischer et al. (2002). Our map was produced by modeling the moderate- to high-yielding climate-soil envelopes for nine major world crops and projecting those areas geographically in regions that are not classified as urban or agricultural by JRC (2003). It represented rain-fed agriculture only, so the area of arable land is likely underestimated. It also does not account for changing future demands for irrigated agriculture that are driven by national policy and finance. These data were derived by The Nature Conservancy, and were displayed in a map published...
Dominant type of groundwater aquifer, by freshwater ecoregion. We derived the dominant groundwater features from the Groundwater Resources of the World data set, a product of the World-wide Hydrogeological Mapping and Assessment Programme (WHYMAP) (Struckmeir and Richts 2007). The WHYMAP Groundwater feature containing the largest surface area within an ecoregion was deemed the dominant feature. Groundwater classes are equivalent to classes stated in the WHYMAP data set. These data were derived by The Nature Conservancy, and were displayed in a map published in The Atlas of Global Conservation (Hoekstra et al., University of California Press, 2010). More information at http://nature.org/atlas. Data derived from:...
These data identify the mean annual population growth rate and ratio change in abundance of common raven (Corvus corax; ravens) populations from 1966 through 2018.
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Bayesian modeling,
Canada,
North America,
United States,
ecoregions,
Area of wetlands in each freshwater ecoregion protected under Ramsar Convention. We derived the area of wetlands of international importance protected under the Ramsar Convention in each freshwater ecoregion from a subset of areas included in the World Database on Protected Areas (WDPA) compiled by the UNEP World Conservation Monitoring Centre (UNEP/IUCN 2007). All Ramsar sites in the database were included, except those known to be purely marine in extent, as indicated by the Marine Classes noted as subtidal in the WDPA. Intertidal marine Ramsar sites, however, are included in the analysis because the sites may include both brackish and fresh-waters. Area attributes for those Ramsar sites within the WDPA that...
Number of freshwater bird species, by freshwater ecoregion. Freshwater obligate birds include those species that need freshwater habitats for breeding (e.g., ducks, herons) or feeding (i.e., birds that depend almost exclusively on food found in freshwater habitats, such as freshwater fish, mollusks, and crustaceans). In all, 815 bird species were found to meet this criterion, with almost all bird families represented. We mapped freshwater bird species to freshwater ecoregions with the following procedures: for North and South America, NatureServe GIS data were summarized by freshwater ecoregion; for Africa, distribution maps presented in Birds of Africa (Brown et al. 1982–1997) were used to assign species to freshwater...
Percent of each terrestrial ecoregion's natural habitat that has been converted by humans. The data on the amount of habitat lost was derived from the Global Land Cover 2000 (JRC 2003), which is based on satellite imagery; the Global Rural-Urban Mapping Project (CIESIN et al. 2004); and a global coverage of roads and railroads compiled from ESRI Digital Chart of the World. While the data tell us how much land has been converted from a natural state to a human-altered state for 2000, it does not tell us about any specific type of habitat that has been lost, what it was converted to, how long ago it was converted, or the extent to which the human land use still supports some biodiversity. Because the satellite-derived...
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