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Find out if Lake Ontario is changing for better or worse

Tim Johnson

Join the Prince Edward County Field Naturalists for a ‘Zoom’ internet meeting with the County’s Tim Johnson, research scientist who will speak about changes in Lake Ontario Tuesday, Nov. 24 at 7 p.m.

The public is welcome to join the meeting by emailing for the Zoom link.

Johnson will focus on Lake Ontario changing, and, if so, is it for the better or for the worse.

The Great Lakes basin represents the world’s largest contiguous freshwater ecosystem, supporting high biodiversity while also serving as a vital hub for the North American economy.

Industrial and urban development, pollution, invasive species, and climate change are all contributing to changes in the biological and chemical composition and functioning of the lake ecosystem and, ultimately, the health and quality of ecological services provided.

Johnson will describe some of the recent and on-going biological, chemical, and physical changes that are occurring in Lake Ontario, related to both human-mediated and natural phenomena.

He is to provide context for these changes, largely to stimulate thinking and a broader understanding of how the effects of these changes may be viewed favourably, or negatively, depending on one’s perspective.

Johnson is a Senior Research Scientist with the Ontario Ministry of Natural Resources and Forestry, based at the Glenora Fisheries Station in eastern Lake Ontario.
He holds a Ph.D. in Zoology with a minor in Limnology and Oceanography from the University of Wisconsin – Madison, in addition to his BSc (Marine Biology – Guelph) and MSc (Biology – York) here in Ontario. Johnson’s research focus is the structure and efficiency of aquatic food webs, including the effects of aquatic invasive species, climate change, and habitat alteration on growth and production of fishes and other aquatic organisms.

He has co-authored more than 85 peer-reviewed publications largely addressing ecological issues within the Great Lakes basin. A former president of the International Association for Great Lakes Research, he is also an Associate Editor for the Journal of Great Lakes Research, and represents the province’s interests on numerous bi-national boards and committees.



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