Filters: Tags: ecoregions (X)
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Landscape level stratification of ecoregions in the Blue Mountain study area. Study area was defined by watershed boundaries because the pathways and distribution of anadromous fish and determined by watershed linkages and landscape characteristics.
This map depicts the 825 terrestrial ecoregions of the globe. Ecoregions are relatively large units of land containing distinct assemblages of natural communities and species, with boundaries that approximate the original extent of natural communities prior to major land-use change. This comprehensive, global map provides a useful framework for conducting biogeographical or macroecological research, for identifying areas of outstanding biodiversity and conservation priority, for assessing the representation and gaps in conservation efforts worldwide, and for communicating the global distribution of natural communities on earth. We have based ecoregion delineations on hundreds of previous biogeographical studies,...
Tags: ecoregions,
world wildlife fund
This dataset depicts indices of forest fragmentation within the western U.S. This dataset can help inform prioritization of landscapes for conservation through identification of more intact forested areas. Forest fragmentation was assessed using information derived from the National Land Cover Dataset (NLCD) and USGS 1:100,000 scale roads. Within each forested ecoregion in the World Wildlife Fund ecoregions dataset, landscape units (land units) were defined using U.S. Census Bureau TIGER highway networks. Land units were blocks of forested land bounded by highways and were required to be at least 2,000 hectares in size. Land units smaller than 2,000 hectares or areas within urban areas were excluded from this analysis....
Tags: ecoregions,
forest fragmentation
Number of snake and lizard species, by terrestrial ecoregion. We compiled data on terrestrial lizards and snakes by querying the WWF WildFinder database for species occurrences by ecoregion of the following taxonomic groups: Sauria, Serpentes, Amphisbaenia, and Rhynchocephalia. The WWF WildFinder database is a spatially explicit online database of vertebrate species occurrences by ecoregion. These data 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.
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,
Number of globally threatened freshwater mammal, bird, and crocodilian species, by freshwater ecoregion. We generated the map of number of freshwater mammals, birds, and crocodilian species per ecoregion that are threatened with extinction from multiple sources, including species range maps, as well as geographic range descriptions from literature and online sources (our primary sources are listed below). Threatened species refer to those listed by IUCN Red List as Vulnerable, Endangered, or Critically Endangered (www.redlist.org). We added together the numbers of threatened species for each of the taxonomic groups by ecoregion. When species range maps were used and a range overlapped several ecoregions, species...
Increasing pressures from land use coupled with future changes in climate will present unique challenges for California’s protected areas. We assessed the potential for future land use conversion on land surrounding existing protected areas in California’s twelve ecoregions, utilizing annual, spatially explicit (250 m) scenario projections of land use for 2006–2100 based on the Intergovernmental Panel on Climate Change Special Report on Emission Scenarios to examine future changes in development, agriculture, and logging. We calculated a conversion threat index (CTI) for each unprotected pixel, combining land use conversion potential with proximity to protected area boundaries, in order to identify ecoregions and...
Categories: Publication;
Types: Journal Citation;
Tags: California,
Coast Range,
Conversion threat index,
Ecoregions,
Future projections,
Degree of water stress by ecoregion - where human demand for water outstrips natural supply. 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. The water stress indicator calculation is based on a global water balance model, coupled with estimates of water use by sector (agriculture, domestic, and industrial). These data were derived from the WaterGAP model developed by the University of Kassel in Germany (Alcamo et al. 2003; Döll et al. 2003). The WaterGAP model combined precipitation, temperature, the location of reservoirs and lakes,...
Tags: ecoregions
Number of freshwater endemic species, by freshwater ecoregion. The map of the number of freshwater endemic species shows the number of endemic fish, freshwater turtles, crocodiles, and amphibians found in each freshwater ecoregion. To calculate the total number of endemic species by ecoregion, we simply added the number of endemic species in these four taxonomic groups. Fish endemics are from Abell et al. (2008). Extirpated fish species are included in these tallies, but resolved extinct species, as determined by the Committee on Recently Extinct Organisms, and introduced species are excluded. Data on amphibian species were generated from distribution maps for 5,640 amphibian species gathered by the Global Amphibian...
This dataset depicts the Level III ecological regions of North America, as compiled by the Commission for Environmental Cooperation (CEC). These draft files of of Level I, II, and III ecological regions of North America are an update and revision of files developed by Canada, the United States, and Mexico in the late 1990's in a cooperative project for the Commission for Environmental Cooperation (CEC 1997). The CEC was created under the North American Agreement on Environmental Cooperation (NAAEC) to address regional environmental concerns, help prevent potential trade and environmental conflicts and promote the effective enforcement of environmental law. The Agreement complements the environmental provisions...
The condition of natural fire systems, by terrestrial ecoregion. Spatial data on the status and trends of fire regimes were developed under the Global Fire Partnership, a collaboration of nongovernment and academic institutions and summarized in Shlisky et al. (2007). The fire regime and its status and trends were established through a formal expert workshop process. Workshops were held around the world from 2004 to 2006. These data 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.
Percent of ecoregion area covered with grassland habitat. We derived the grasslands map from grassland classes of the Global Land Cover 2000 data set (JRC 2003) with areas of human habitation and infrastructure from the Global Rural-Urban Mapping Project database (CIESIN et al. 2004) removed. We applied a zonal sum procedure to those data to show the amount of forest by ecoregion. 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: Center for International Earth Science Information Network (CIESIN), International Food...
These data identify the mean population growth rate and ratio change in abundance of common raven (Corvus corax; ravens) populations from 1966 through 2018, delineated by ecoregions defined by the U.S. Environmental Protection Agency. This enables researchers and land managers to identify regions which may be more heavily affected by growing raven populations. These data support the following publication: Harju, S.M., Coates, P.S., Dettenmaier, S.J., Dinkins, J.B., Jackson, P.J. and Chenaille, M.P., 2022. Estimating trends of common raven populations in North America, 1966–2018. Human–Wildlife Interactions, 15(3), p.5. https://doi.org/10.26077/c27f-e335
Ecoregiones de Paraguay
The average percent of forest cleared per year between 2000 – 2005, by terrestrial ecoregion. The map of forest clearing was produced using Vegetation Continuous Field (VCF) data (Hansen et al. 2006). VCF files were assembled by year for 2000 through 2005 by realm. These data sets were resampled to one-kilometer ground resolution and merged into a global product by year. We then subtracted data from 2001 from 2000 data; this process was applied to all subsequent years. The derived, differenced data sets were averaged to obtain an annual av¬erage for years 2000–2005. 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...
This map depicts the 825 terrestrial ecoregions of the globe. Ecoregions are relatively large units of land containing distinct assemblages of natural communities and species, with boundaries that approximate the original extent of natural communities prior to major land-use change. This comprehensive, global map provides a useful framework for conducting biogeographical or macroecological research, for identifying areas of outstanding biodiversity and conservation priority, for assessing the representation and gaps in conservation efforts worldwide, and for communicating the global distribution of natural communities on earth. We have based ecoregion delineations on hundreds of previous biogeographical studies,...
Tags: ecoregions,
world wildlife fund
Ecoregions of Canada and the United States (including Lower 48, Alaska and Hawaii) (North America). January, 2004.
The second edition of "Ecoregions of Montana" (2002) revises many ecoregion polygon assignments that appeared in the first edition (Woods and others, 1999). These changes were made after research in Idaho (McGrath and others, 2002) recognized the Idaho Batholith as a separate level III ecoregion (Ecoregion 16), limited the Northern Rockies (15) to strongly marine-influenced areas, and transferred the Montana Valley and Foothill Prairies (formerly Ecoregion 16) to another level III ecoregion, the Middle Rockies (17). The second edition also modifies a few level IV ecoregion lines along Montana's western border so that ecoregions shared by Montana and Idaho will edge match. In addition, it updates ecoregion...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Ecoregions,
MT,
Montana
Permeability refers to the degree to which a landscape sustains ecological processes and supports movement of many species by virtue of the structural connectedness of its natural systems (Meiklejohn et al 2010). We used resistant kernel analysis (Compton et al. 2007) to map permeability as a focal statistic based on the resistance data from the terrestrial condition dataset. The analysis evaluates the capacity for ecological flow outward from each focal cell into its local neighborhood up to a maximum of 3-km, then combines the results into a final, study-wide surface. Perm_Score: Our permeability analysis evaluates the connectivity of a focal cell to its ecological neighborhood when the cell is viewed as a source;...
Terrestrial Ecosystems of the World (TEOW), version 2.0, published by the World Wildlife Fund. Citation: Olson, D. M., Dinerstein, E., Wikramanayake, E. D., Burgess, N. D., Powell, G. V. N., Underwood, E. C., D'Amico, J. A., Itoua, I., Strand, H. E., Morrison, J. C., Loucks, C. J., Allnutt, T. F., Ricketts, T. H., Kura, Y., Lamoreux, J. F., Wettengel, W. W., Hedao, P., Kassem, K. R. 2001. Terrestrial ecoregions of the world: a new map of life on Earth. Bioscience 51(11):933-938. From metadata: This map depicts the 825 terrestrial ecoregions of the globe. Ecoregions are relatively large units of land containing distinct assemblages of natural communities and species, with boundaries that approximate the original...
Categories: Data;
Types: Downloadable,
Map Service,
Shapefile;
Tags: Ecoregions,
World Wildlife Fund
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