Calcareous shoreline outcrops are threatened by development (e.g., residential, agricultural, industrial), either directly within the community or in the surrounding landscape. Structures built along the shoreline are a particular threat to this community (e.g., riprap, boat launches, cabins). Other threats include habitat alteration (e.g., road crossings, logging, mining), and relatively minor recreational overuse (e.g., boating, ATVs, trampling by visitors, campgrounds, picnic areas, fishing, trash dumping). Threats to the adjacent lake and river may apply to the shoreline outcrop (e.g., pollution, nutrient loading, sedimentation, impoundments/flooding, water release for rafting). Several calcareous shoreline outcrops are threatened by invasive species, such as purple loosestrife (Lythrum salicaria), reed canary grass (Phalaris arundinacea), reedgrass (Phragmites australis ssp. australis ), Canada bluegrass (Poa compressa), multiflora rose (Rosa multiflora), colt's foot (Tussilago farfara), and buckthorn (Rhamnus cathartica).
|Conservation Strategies and Management Practices||
Where practical, establish and maintain a natural forested buffer to reduce storm-water, pollution, and nutrient run-off, while simultaneously capturing sediments before they reach the shoreline. Avoid habitat alteration along the shoreline and surrounding landscape. Restore calcareous shoreline outcrop communities that have been unnaturally disturbed (e.g., remove obsolete impoundments in order to restore the natural hydrology). Prevent the spread of invasive exotic species into the shoreline outcrop through appropriate direct management, and by minimizing potential dispersal corridors, such as roads and bridges.
Research composition of calcareous shoreline outcrops statewide in order to characterize variations (e.g., river vs. lake shorelines). Collect sufficient plot data to support the recognition of several distinct calcareous shoreline outcrop types based on composition, specific geology, and by ecoregion.