Use of Water Clarity to Monitor the Effects of Climate Change and other Stressors on Oligotrophic Lakes |
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| Authors: | John M Gunn Ed Snucins Norman D Yan Michael T Arts |
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| Institution: | (1) Ontario Ministry of Natural Resources, Cooperative Freshwater Ecology Unit, Laurentian University, Sudbury, ON, Canada;(2) Ontario Ministry of Natural Resources, Cooperative Freshwater Ecology Unit, Laurentian University, Sudbury, ON, Canada;(3) Ontario Ministry of the Environment, Dorset, ON, Canada;(4) Aquatic Ecosystem Impact Branch, National Water Research Institute, Burlington, ON, Canada |
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| Abstract: | We present evidence from studies oflakes in Killarney Park, Ontario, Canada that waterclarity is a key variable for monitoring theeffects of climate change, high UV exposure andacidification. In small oligotrophic lakes, thesestressors affect water clarity primarily byaltering the concentration of DOC in lake water. Clear lakes (<2 mg L-1 DOC) proved to be highlysensitive indicators of stressors, exhibiting largethermal and optical responses to small changes inDOC. Extremely clear (<0.5 mg L-1 DOC) acidic lakesshowed the effects of climate change and solarbleaching in recent decades. These lakes becamemuch clearer even though they were slowlyrecovering from acidification. |
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| Keywords: | acidification core variable solar bleaching thermal and optical responses water clarity |
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