LEWISTON — University of Southern Maine’s Lewiston-Auburn Senior College will soon delve into the topic of how Maine’s lakes are impacted by climate change.

Roberta Hill, an aquatic ecologist and environmental educator, will be the focus of the college’s “Food for Thought” program at 4 p.m. Tuesday, March 23.

Hill has been active in the field of lake protection and community outreach in Maine for more than 20 years, leading community-based projects that have included watershed surveys, non-point source remediation, and invasive aquatic plant monitoring. She also has been instrumental in the creation and development of some of Maine’s most successful and long-standing lake education programs.

As invasive species program director for Lake Stewards of Maine, Hill is the originator and coordinator of LSM’s Invasive Plant Patrol program. This program is well known nationally and internationally as a model for citizen-based early detection. Hill also is the principal author of the “Maine Field Guide to Invasive Aquatic Plants” and co-author of “Citizens’ Guide to Invasive Aquatic Plant Management.”

Hill also will cover changes in watersheds affecting water quality, species of fish, and the presence of algae, caused when air and water temperatures change.

To sign up, email to laseniorcollege.com by noon on Monday, March 22. The link is available free to all ages, not just seniors.