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Sustainable Strategies for Lakes in a Changing Environment: SLICE Outcomes and Recommendations

Explore key drivers affecting lakes such as runoff, longer growing seasons, warmer waters, and exotic species invasions. Learn about the consequences on fish populations and the declining resilience of clear-water regimes. Discover the importance of monitoring stressors, habitat conditions, and fish indicators for sustainable lake management.

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Sustainable Strategies for Lakes in a Changing Environment: SLICE Outcomes and Recommendations

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  1. Sustaining Lakes in a Changing Environment - SLICE

  2. Outcomes of Drivers • More runoff – flow, sediment, nutrient loading (indicators) • Longer growing seasons • Warmer waters • Wet-dry fluxes (evaporation & precip) • Exotic species invasions Result: Warmer, more productive waters

  3. Resilient: turbid-water; no macrophytes Resilient: Clear-water; macrophytes Eutrophication Declining resiliency of clear-water regime Ecosystem State Scheffer and Carpenter 2003

  4. Need 1: monitoring stressors and habitat conditions

  5. Consequences on Fish

  6. 160 140 120 100 80 Fish-based IBI 60 40 20 0 25 35 45 55 65 75 Trophic state Fish & disturbance 140 120 100 Fish-based IBI 80 60 40 20 For > 60% For Ag & For Ag, For & Urban Ag Urban Drake and Valley 2005

  7. Need 2: Monitoring fish population and community indicators

  8. Need 3: Going beyond documenting the decline Predictive modeling of consequences of alternative scenarios on habitat and fish

  9. Strategy to meet “needs” • A focus on adaptation and mitigation strategies • Designing a collaborative long-term monitoring program (SLICE) • 4-yr pilot to: • Identify sensitive habitat and fish indicators • Identify important stressor-habitat-fish links and mechanisms • Build partnerships

  10. Sentinel Lakes Pilot - Objectives • Retrospective analysis of fish and habitat “status” of 24 sentinel lakes • Simulation modeling to forecast outcomes of alternative climate and land use changes on fish habitat and fish • ID set of habitat and fish indicators most responsive to climate and land use change. • Design of SLICE (e.g., approp. Sampling frequency, split-panel design)

  11. Sentinel Lake Selection • Criteria: • Ecoregion (4) • Mixing Status (Stratified and Unstratified) • Total Phosphorus (Low, Med, High – Ecoregion specific) • Additional criteria inc. good historical data sets (e.g. PCA ref lakes, sediment cores, lake level monitoring), or partnership opportunities • Fisheries Area Workloads considered

  12. What we’re collecting… • Monthly water quality profiles (TP, TN, Chl a, ions, temp/DO - PCA) • Secchi & Lake level – Citizens • Monthly Zooplankton – PCA & DNR • Annual aquatic plant surveys – DNR • Annual fish surveys - DNR

  13. Split-Panel Design Year 1 2 3 4 5 6 7 8 = “Panel” or Group of Lakes

  14. Sentinel lakes • Monitoring will be intensive Split-Panel Design Year 1 2 3 4 5 6 7 8 = “Panel” or Group of Lakes

  15. Random surveys • To work into Fisheries Lake Survey Program • Monitoring fewer indicators in more lakes • Approach is “extensive” Split-Panel Design Year 1 2 3 4 5 6 7 8 = “Panel” or Group of Lakes

  16. How lake associations can get involved • CLMP • Lake level monitoring • Financing ongoing water chemistry testing (profiles) • Temp/DO monitoring • Shoreline development monitoring (protocols being developed by DNR)

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