Parent Layer: Species Diversity

Name: Beta Diversity normalized

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Description: The number of species that are not the same in two different environments; functional groups and vegetation communities. Beta diversity is a valuable complement to species richness due to its ability to link local-scale changes in species occurrence to landscape-scale shifts in patterns of species composition. Beta diversity measures changes in species composition by comparing species richness and species presence in one locality to all localities within a specified neighborhood size or among specified areas of interest. Localities exhibiting high beta diversity are distinctly unique in terms of species composition as compared to other localities used for comparison. Unlike species richness, beta diversity provides a measure of species composition that can be used to help identify localities which may harbor rare species, localities which could be sources for landscape-level diversity, and regions of either high heterogeneity or homogeneity. Calculated through time, beta diversity can also detect trends in diversity (i.e., loss or gain of heterogeneity among sites) or detect areas in which species composition changes very little.----------------This raster has been modified from the base 30m version in the following ways:-------- - It has been aggregated from a 30m to a 300m scale by averaging across the 30m values-------- - The normalized values are rescaled based on the full range of potential values, with -1 representing low values, and 1 representing high values. This interpretation reflects concern for the conservation of species diversity, with higher beta diversity considered to be areas with greater conservation value.----------------- Unit Of Measure: Sørensen index, 0 to 1

Copyright Text: USDA Forest Service - Region 5 and Pacific Southwest Research Station (PSW): The USDA Forest Service makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy, reliability, completeness, or utility of these geospatial data, or for the improper or incorrect use of these geospatial data. These geospatial data and related maps or graphics are not legal documents and are not intended to be used as such. The data and maps may not be used to determine title, ownership, legal descriptions or boundaries, legal jurisdiction, or restrictions that may be in place on either public or private land. Natural hazards may or may not be depicted on the data and maps, and land users should exercise due caution. The data are dynamic and may change over time. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly.--------------------------------US Geological Survey, Earth Resources Observation and Science (EROS) Center: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.--------------------------------California Department of Fish and Wildlife: Terrestrial Connectivity, Areas of Conservation Emphasis (ACE), version 3.1. Last updated 08/21/2019.The Terrestrial Connectivity dataset is one of the four key components of the California Department of Fish and Wildlife’s (CDFW) Areas of Conservation Emphasis (ACE) suite of terrestrial conservation information

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