Levels of acidification can be different in coastal marine waters than in the open ocean. Inputs from freshwater rivers and nutrient runoff from land can change water chemistry in coastal areas.

Sarah Gladu and Kathleen Thornton will offer an online presentation from 4 to 6 p.m. on Wednesday, May 27 about the coastal acidification and what data gathered by the Maine Coastal Observing Alliance (MCOA) are documenting in midcoast Maine. They will also cover what is being done locally to better understand this problem and related water quality issues.

The presentation is free. Registration is required online at coastalrivers.org

MCOA is a coalition of non-profits focusing on gathering water quality data along the coast from Harraseeket to Belfast Harbor. Kathleen Thornton is a research specialist at the University of Maine’s Darling Marine Center. Sarah Gladu is chair of MCOA and director of Education and Citizen Science at Coastal Rivers.

Coastal Rivers Conservation Trust is a non-profit, nationally accredited land trust with active programs in land conservation, water quality, trails and public access, and nature education in the Damariscotta-Pemaquid region. For more information, email info@coastalrivers.org or visit www.coastalrivers.org