Lakes with DNR Fisheries IBI Scores [Minnesota]
Minnesota Geospatial Commons · 2025 Full Details
Full Details
- Title
- Lakes with DNR Fisheries IBI Scores [Minnesota]
- Description
- This layer shows the <b>Fish-based Index of Biological Integrity (IBI) Scores</b> for MN lakes as calculated by DNR Fisheries. Scores range from 0-100, with higher scores indicating higher biological integrity. The score corresponding with the <u>most recent IBI survey</u> with high quality data for each lake is displayed; however, scores for all surveys are included in the layer (i.e., multiple records for each lake may exist and corresponding data can be found in the attribute table). An IBI is a biologically-based, multi-metric method for measuring the integrity of aquatic systems. Minnesota DNR Fisheries has developed four fish-based lake IBIs that incorporate fish data collected by various methods (trap nets, gill nets, shoreline seines, and backpack electrofishing units) into 8-15 metrics in three categories: <b>species richness, community assemblage, and trophic composition </b> <i>(see Section 5: Attributes)</i>. Each metric represents an aspect of the biological assemblage structure, function, or other measurable characteristic that changes in some predictable way with increased human-induced stress. Fish-based IBI scores respond to differences in land use patterns, trophic state, and aquatic vegetation. The fish-based IBI is a tool used for assessing lake impairment as part of Minnesota's 303(d) <i>Impaired Waters</i> assessments. The scores in this layer should be considered as '<u>preliminary</u>' until a lake is assessed (see <a href="https://resources.gisdata.mn.gov/pub/gdrs/data/pub/us_mn_state_dnr/env_ibi_lakes_fisheries/metadata/../../env_aquatic_life_use_judgement/metadata/metadata.html" target=_blank><b>Lakes with Aquatic Life Use Judgement (Based on Fish IBI)</b></a> layer for assessment information). Stressor identification is then completed for lakes assessed as impaired or vulnerable (see <a href="https://resources.gisdata.mn.gov/pub/gdrs/data/pub/us_mn_state_dnr/env_ibi_lakes_fisheries/metadata/../../env_ibi_lakes_stressors/metadata/metadata.html" target=_blank><b>Stressors to Impaired or Vulnerable Lakes (Based on Fish IBI)</b></a> layer for candidate stressors and associated information). <b>This dataset only includes lakes over 100 acres and within lake classes 22-43, with few exceptions for lakes very close to 100 acres</b>. Additional scores are added to this dataset annually. For more reference information, see <i>(Section 5: Attributes -- Detailed Citation)</i>., This layer provides a visual representation of Fish IBI scores to help assess and monitor the condition of Minnesota lakes, and for the purposes of planning, mapping and spatial/temporal analysis. For each lake, the status of the most recent Fish IBI score is displayed by color; scores from previous years can be accessed through the attribute table., Re-delineations and edits are frequent and occur as needed.
- Creator
- DNR Division of Fish and Wildlife - Section of Fisheries
- Publisher
- Minnesota Geospatial Commons
- Temporal Coverage
- 2025-05-01
- Rights
- None
- Access Rights
- Public
- Format
- Files
- Language
- English
- Date Added
- April 26, 2021
- Provenance Statement
- The metadata for this resource was last retrieved from the Minnesota Geospatial Commons on 2025-08-26.
Location
Download
Links
Cite and Reference
-
Citation
DNR Division of Fish and Wildlife - Section of Fisheries (n.d.). Lakes with DNR Fisheries IBI Scores [Minnesota]. Minnesota Geospatial Commons. https://gisdata.mn.gov/dataset/a4feea0d-7270-47f0-a0a1-dec9c377e9aa (dataset) -
BTAA Geoportal Link
