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The Biological Stream Characterization (BSC) and Biologically Significant Streams (BSS) are tools for evaluating intactness (i.e., proportion of maximum species count retained) of aquatic life assemblages in Illinois’ streams and rivers. The BSC compares historical (all records) to contemporary (1990 to current) species-level habitat suitability and applies a grade (A, B, C, D, F) to all Illinois stream reaches, with higher letters representing more intact assemblages. The BSS is applied only to reaches with species observations and is the ratio between either contemporary occurrence records to historical occurrence records (BSS 1) or contemporary occurrence records to historical modeled species presence (BSS2). Reach-level BSS1 and BSS2 status was assigned based on the reach-level value of each ratio relative to all reaches graded. |
| summary:
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The Biological Stream Characterization (BSC) and Biologically Significant Streams (BSS) are tools for evaluating intactness (i.e., proportion of maximum species count retained) of aquatic life assemblages in Illinois’ streams and rivers. The BSC compares historical (all records) to contemporary (1990 to current) species-level habitat suitability and applies a grade (A, B, C, D, F) to all Illinois stream reaches, with higher letters representing more intact assemblages. The BSS is applied only to reaches with species observations and is the ratio between either contemporary occurrence records to historical occurrence records (BSS 1) or contemporary occurrence records to historical modeled species presence (BSS2). Reach-level BSS1 and BSS2 status was assigned based on the reach-level value of each ratio relative to all reaches graded. |
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[[-91.5846843074701,36.9754909545065],[-87.3939966607551,42.5149140575732]]
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| typeKeywords:
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["Data","Service","Map Service","ArcGIS Server"]
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| description:
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| catalogPath:
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| title:
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IDNRBSS2025
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| type:
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Map Service
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| url:
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[]
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| culture:
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en-US
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| name:
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IDNRBSS2025
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Illinois_State_Transverse_Mercator
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