Midwest Mussel Species Richness Estimates
收藏US Fish and Wildlife Service Open Data2026-03-28 收录
下载链接：
https://gis-fws.opendata.arcgis.com/datasets/fws::midwest-mussel-species-richness-estimates
下载链接
链接失效反馈官方服务：
资源简介：
<b>More Details</b><div><span style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>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. </span><span style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>Stream-level SR and endemism metrics within each HUC region were strongly right-skewed (many smaller values and few large values).</span><br /></div><div><span style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><br /></span></div><div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><font style='font-family:inherit;'><span style='font-family:inherit;'><b>Fields of Note</b></span></font></div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><b>COMID</b> - Stream reach ID</div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><b>SS_SR</b> - Estimated species richness</div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><b>SS_WE</b> - Estimated weighted endemism</div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><b>SS_CWE</b> - Corrected weighted endemism</div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><font style='font-family:inherit;'><span style='font-family:inherit;'><b><br /></b></span></font></div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><font style='font-family:inherit;'><span style='font-family:inherit;'><b>Additional Resources</b></span></font></div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>This data, as well as data layers depicting hot/cold spots of species richness and other biodiversity metrics at HUC4, HUC6, and HUC8 spatial scales, are available for download here: <a href='https://www.sciencebase.gov/catalog/item/65d762ced34ec3e1801d7e30' style='color:rgb(0, 97, 155); text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>https://www.sciencebase.gov/catalog/item/65d762ced34ec3e1801d7e30</a>.</div></div>
提供机构：
U.S. Fish & Wildlife Service
