2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2019 | 2:45 PM - 3:00 PM | MANAGING FOR RESILIENCE OF COLDWATER FISH HABITAT IN GLACIAL LAKES USING LAKE-SPECIFIC WATERSHED LAND USE THRESHOLDS | 150 G
MANAGING FOR RESILIENCE OF COLDWATER FISH HABITAT IN GLACIAL LAKES USING LAKE-SPECIFIC WATERSHED LAND USE THRESHOLDS
Coldwater fish habitat in lakes is threatened by both climate change and eutrophication. We classified coldwater fish habitat as optimal (Tier 1), marginal (Tier 2), or unsuitable (Tier 3) for over 10,000 glacial lakes in an 4 state region, including 938 lakes in which coldwater cisco (Coregonus artedi) are present. We quantified lake-specific responses to changes in climate and land use to prioritize restoration and protection. Coldwater fish habitat depends on lake morphometry, summer air temperatures, and watershed land use. Under contemporary conditions, we identified 333 Tier 1 lakes. Of these, 8% were predicted to remain Tier 1 across all levels of watershed development and up to 15°C temperature increases; these lakes can serve as climate refugia. Managing watershed forest cover affected resilience of a number of lakes. For example, 65% of Tier 1 lakes are at risk of becoming Tier 2 under mid-century climate predictions, although 15% of those could remain Tier 1 if watershed forest cover was increased. By quantifying the resilience of cisco lakes and how it is influenced by local action across a multi-state region, we can prioritize conservation action to maintain coldwater fish habitat.
- Fish
- Eutrophication
- ClimateChange
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Presenters/Authors
Gretchen Hansen
(), University of Minnesota, ghansen@umn.edu;
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Peter Jacobson
(), Minnesota Department Of Natural Resources - Fisheries, peter.jacobson@state.mn.us;
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Kevin Wehrly
(), Michigan Department of Natural Resources, wehrlyk@michigan.gov;
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