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The delineation of priority areas in western North America for managing Greater Sage-Grouse (Centrocercus urophasianus) represents a broad-scale experiment in conservation biology. The strategy of limiting spatial disturbance and focusing conservation actions within delineated areas may benefit the greatest proportion of Greater Sage-Grouse. However, land use under normal restrictions outside priority areas potentially limits dispersal and gene flow, which can isolate priority areas and lead to spatially disjunct populations. We used graph theory, representing priority areas as spatially distributed nodes interconnected by movement corridors, to understand the capacity of priority areas to function as connected...
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The Land Cover Data - Version 1.0 represents a highly thematically detailed land cover map of the U.S. The map legend includes types described by NatureServe's Ecological Systems Classification (Comer et al. 2002) as well as land use classes described in the National Land Cover Dataset 2001 (Homer et al. 2007). This version of the land cover data was used to support the Gap Analysis Project's vertebrate species modeling efforts. These data cover the entire continental U.S. and are a continuous data layer. These raster data have a 30 m x 30 m cell resolution. This land cover data set is considered official foundational data for the GAP species modeling process. The data have been made available provisionally to enhance...
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The data describe the number, density, date of collection, and exact collection location of fish eggs (from multiple species) collected in the St. Clair and Detroit Rivers from 2005-2016.
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We partitioned a Mahalanobis D2 model of sage-grouse habitat use into separate additive components each representing independent combinations of species-habitat relationships to identify and map range-wide ecological minimums for sage-grouse. We assumed the states delineations of priority areas capture higher quality habitat and larger numbers of sage-grouse populations across our study area. We randomly selected 1669 points from the priority areas and corresponding variables GIS datasets to calibrate models. We estimated distributions of our variables from 1000 iterative samples created by bootstrapping the calibration data. To better incorporate conditions in both large and small priority areas, we restricted...
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The Great Lakes Research Vessel Operations data release is taken from the Research Vessel Catch (RVCAT) database curated at the Great Lakes Science Center (GLSC). RVCAT has been used as the primary data collection tool aboard the GLSC’s research vessel operations. Content: The data set has been collected on various vessel operations on all the Great Lakes and select connecting waterways between the years 1958-2018. Data collection begins in early spring and ends in late fall. Each vessel operation was completed for a specific purpose, or target mission, which are enumerated in this data set. In addition to vessel operations data, RVCAT collects trawl and gillnet catch data, sample information of fish species caught,...
Types: Citation; Tags: Alewife, Bathythermograph, Benthos, Bloater, Cisco, All tags...


    map background search result map search result map USGS Gap Analysis Project - Additional Data – National Gap Land Cover Ver 1.0 (2001) Great Lakes Research Vessel Operations 1958-2018. (ver. 3.0, April 2019) USGS Land Cover - Woodland for Alabama 20160517 State or Territory Shapefile USGS Land Cover - Woodland for Mississippi 20160519 State or Territory Shapefile Fish eggs collected in the St. Clair and Detroit rivers, 2005-2016 Ecological Minimums for Greater Sage-grouse across their Historic Range in Western North America Raster digital data sets identifying a range-wide network of priority areas for greater sage-grouse Fish eggs collected in the St. Clair and Detroit rivers, 2005-2016 USGS Land Cover - Woodland for Mississippi 20160519 State or Territory Shapefile USGS Land Cover - Woodland for Alabama 20160517 State or Territory Shapefile Great Lakes Research Vessel Operations 1958-2018. (ver. 3.0, April 2019) Ecological Minimums for Greater Sage-grouse across their Historic Range in Western North America Raster digital data sets identifying a range-wide network of priority areas for greater sage-grouse USGS Gap Analysis Project - Additional Data – National Gap Land Cover Ver 1.0 (2001)