2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2019 | 10:15 AM - 10:30 AM | USING CRITICAL LOADS OF AQUATIC SYSTEMS TO GUIDE FEDERAL LAND MANAGEMENT | 151 DEF
USING CRITICAL LOADS OF AQUATIC SYSTEMS TO GUIDE FEDERAL LAND MANAGEMENT
The National Park Service protects the natural and cultural diversity of some of America’s definitive landscapes. Many of these areas have long been deteriorating due to acid rain pollution which has begun a rapid decline after the passage of the 1990 Clean Air Act Amendment. But, as emissions began to decline not all affected ecosystems responded in kind. Therefore scientists and managers came together to identify thresholds of pollution at which ecosystems were expected to change, and thus provide a goal for future emissions reductions to preserve parks and allow them to recover.
Critical loads of aquatic systems identify the amount of pollution at which negative impacts occur (decreased ANC/pH) to freshwater and the species existing within (decline in fish growth/reproduction). These thresholds are used to understand the risk to park resources, and have been an effective tool for communication among scientists, managers, policy makers, and the public. As emissions are declining below the critical loads, we are seeing some systems rebound while others remain impaired. Comparing and contrasting how species are responding allows managers to determine where active management (liming, species reintroduction) is necessary to rebuild the natural community.
- Environmental Regulation
- Conservation
- Biogeochemistry
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Presenters/Authors
Michael Bell
(), National Park Service, Air Resources Division, michael_d_bell@nps.gov;
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Andrea Stacy
(), National Park Service, Air Resources Division, andrea_stacy@nps.gov ;
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Jim Renfro
(), Great Smoky Mountains National Park, jim_renfro@nps.gov ;
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Jayln Cummings
(), Shenandoah National Park, jalyn_cummings@nps.gov ;
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