Midwest Mussel Hotspots (HUC8) [United States]
U.S. Fish and Wildlife Service Open Data · 2024 Full Details
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Full Details
- Title
- Midwest Mussel Hotspots (HUC8) [United States]
- Description
- More Details Spatial patterns in mussel richness and endemism (i.e., weighted and corrected weighted endemism) at HUC4, HUC6, and HUC8 spatial scales were characterized. Stream SR was estimated by summing the total number of mussel species predicted within each stream. Stream-level weighted endemism was calculated by weighting each species' presence in the stream by the inverse of the total number of streams it was predicted to occupy, then summing across all species predicted present within the stream. This biodiversity metric therefore provides context about the range extent of the species predicted within the stream (e.g., higher values indicate either high richness or the presence of several range-restricted species). Stream-level corrected weighted endemism was calculated by dividing weighted endemism by the total number of species predicted present within the stream. This metric therefore corrects for an abundance of species predicted present within a stream (meaning, larger corrected weighted endemism values indicate the presence of more range-restricted species). Endemism metrics were rescaled to fall between zero and one to increase metric interpretability. These rescaled values were used in ensuing analyses. Stream-level SR and endemism metrics within each HUC region were strongly right-skewed (many smaller values and few large values). This necessitated calculating the median value of these richness and endemism metrics across all streams within each HUC region. Next, local neighborhoods for each HUC4, HUC6 and HUC8 region were generated to account for the degree of spatial connectivity among HUC regions (i.e. the number of neighboring regions for each HUC). These neighborhoods, as well as HUC median richness and endemism values, were then used to estimate 1) a global Moran's I across the entire study region and 2) a local Getis-Ord Gi statistic for each HUC region. The global Moran's I analysis evaluates directionality in, and magnitude of, spatial autocorrelation (i.e., whether high or low values cluster together, are randomly distributed or are overdispersed) throughout an entire region. Alternatively, the local Getis-Ord Gi statistic identifies clusters of zones within the entire region that contain statistically greater or lesser values of interest. HUC regions associated with statistically significant (α = 0.05, P < 0.025 and P > 0.975) values from the Getis-Ord analysis were classified as hot or cold spots of mussel richness or endemism. Fields of Note HUC - HUC region ID States - State(s) containing each HUC region Name - HUC region name SS_SR - Estimated species richness ssSR_HtSp - HUC region hotspot status based on species richness Additional Resources This data, as well as data layers depicting hot/cold spots of species richness and other biodiversity metrics at HUC4 and HUC6 spatial scales, are available for download here: https://www.sciencebase.gov/catalog/item/65d762ced34ec3e1801d7e30 .
- Creator
- U.S. Fish & Wildlife Service
- Publisher
- U.S. Fish and Wildlife Service Open Data
- Temporal Coverage
- Last Modified: 2024-04-26
- Date Issued
- 2023-12-08
- Rights
- The United States Fish and Wildlife Service (Service) shall not be held liable for improper or incorrect use of the data described and/or contained herein. While the Service makes every reasonable effort to ensure the accuracy and completeness of data provided for distribution, it may not have the necessary accuracy or completeness required for every possible intended use. The Service recommends that data users consult the associated metadata record to understand the quality and possible limitations of the data. The Service creates metadata records in accordance with the standards endorsed by the Federal Geographic Data Committee. As a result of the above considerations, the Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of the data. It is the responsibility of the data user to use the data in a manner consistent with the limitations of geospatial data in general and these data in particular. Although these data have been processed successfully on a computer system at the Service, no warranty, expressed or implied, is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This applies to the use of the data both alone and in aggregate with other data and information.
- Access Rights
- Public
- Format
- ArcGIS FeatureLayer
- Language
- English
- Date Added
- August 10, 2025
- Provenance Statement
- The metadata for this resource was last retrieved from U.S. Fish and Wildlife Service Open Data on 2026-01-08.
Cite and Reference
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Citation
U.S. Fish & Wildlife Service (2023). Midwest Mussel Hotspots (HUC8) [United States]. U.S. Fish and Wildlife Service Open Data. https://gis-fws.opendata.arcgis.com/datasets/fws::midwest-mussel-hotspots-huc8 (web service) -
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