While scientists speculated that sulfur dioxide and nitrogen emissions from coal-fired power plants were responsible, there was inadequate evidence to support this hypothesis. Whole-lake experiments at the IISD-ELA proved that acid rain, mimicked through the addition of sulfuric acid to lakes, resulted in dramatic impacts on lake food webs, including the collapse of fish populations. Changes were observed at acid concentrations much lower than those shown to be directly toxic to fish in laboratory studies.
The findings strongly influenced emission control restrictions in the United States and Canada.
The research continues in Lake 223, where researchers are trying to discover if recolonizing the lake with Mysis will restore the lake trout populations that crashed during the initial research project.
Full title: Restoration of Freshwater Food Webs Through Mysis Addition
Project dates: 2018 –
Lead scientist(s): Michael Rennie
Experimental lake(s): 223
Related topic(s): Acid rain
Collaborators: Lakehead University