Researchers report that 148 years of fishing records in Canada's Lake Simcoe show that during a period of commercial fishing the mean trophic level of the catch declined, indicating depletion of high-trophic-level fish, and the mean trophic level began to recover when fishing switched from commercial to recreational; fish stocking and introduction of invasive species also altered trophic level indicators in the lake, according to the study.
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Article #19-08272: "Fishing down then up the food web of an invaded lake," by Erin S. Dunlop, Daisuke Goto, and Donald A. Jackson.
MEDIA CONTACT: Erin S. Dunlop, Ontario Ministry of Natural Resources, Peterborough, CANADA; e-mail: Erin.Dunlop@ontario.ca
Journal
Proceedings of the National Academy of Sciences