View ECCC Data Mart (French) (French, HTML)

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Publisher-reported update

2026-08-17

The objective of the Canadian Wildlife Service (Ontario Region) Acid Rain Biomonitoring Program (ARBP) was to evaluate the response of biological communities in acidified, damaged and acid sensitive lakes and wetlands in response to regulation driven changes in deposition of acidifying pollutants. Supported by a research phase from 1981-1987, the biomonitoring program began in 1988 and ended in 2010. The program primarily focused on the small lakes and wetlands important to breeding aquatic birds, with many of the study lakes being headwaters or otherwise located in the upper reaches of watersheds. Beginning in the late 1980s, monitoring and studies focused on the Algoma (Block 12), Sudbury (Block 37) and Muskoka (Block 1) regions of Ontario. The Experimental Lakes Area (ELA; Block 24) was added as a fourth study area and was sampled in 2002 and 2009. The ARBP involved three main monitoring components. The water sampling component targeted approximately 250 to 350 lakes per year, with the schedule for Algoma, Sudbury and Muskoka aiming for a rotation such that a subset of lakes were sampled in adjacent years. Lakes were sampled near fall overturn using a helicopter on floats and…

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