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District Municipality of Muskoka Muskoka Water Web

How Healthy Are Our Lakes


On Thursday July 31, 2008 the Muskoka Watershed Council and the Muskoka Heritage Foundation hosted a lecture by top scientists from the Dorset Environmental Science Centre. The lecture was given in three parts.


Part 1: Overview of the Dorset Environmental Science Centre given by Dr. Keith Somers

Part 2: The Acid Rain Story given by Dr. Norman Yan

Part 3: The P Story: Why Are Our Lakes Losing Phosphorus given by Dr. Andrew Paterson



Learn More

The lectures highlighted several articles that have been published by the Dorset Environmental Science Centre in the Canadian Journal of Fisheries and Aquatic Sciences (Volume 65 Number 5, May 2008). Full articles are available by clicking on the links below.


  1. An introduction to the Dorset special issue: transforming understanding of factors that regulate aquatic ecosystems on the southern Canadian Shield.
  2. Relationship between dissolved organic carbon concentrations, weather, and acidification in small Boreal Shield lakes.
  3. Influence of seasonal changes in runoff and extreme events in dissolved organic carbon trends in wetlands and upland- draining streams.
  4. Long-term trends in catchment export and lake concentrations of base cations in the Dorset study areas, central Ontario.
  5. Estimating calcium weathering rates and future lake calcium concentrations in the Muskoka-Haliburton region of Ontario.
  6. Drought-induced metal releases from a wetland at Plastic Lake, central Ontario.
  7. Long-term changes in phytoplankton composition in seven Canadian Shield lakes in response to multiple anthropogenic stressors.
  8. Long-term trends in zooplankton of Dorset, Ontario, lakes: the probable interactive effects of changes in pH, total phosphorus, dissolved organic carbon and predators.
  9. Regional climate drivers of synchronous zooplankton dynamics in north-temperate lakes.
  10. Response of benthic macroinvertebrate communities to El Nino related drought events in six upland streams in south-central Ontario.
  11. Changes in littoral benthic macroinvertebrate communities in relation to water chemistry in 17 Precambrian Shield lakes.
  12. Temporal and spatial concordance in community composition of phytoplankton, zooplankton, macroinvertebrates, crayfish and fish on the Precambrian Shield.
  13. Long-term assessment of ecological effects of anthropogenic stressors on aquatic ecosystems from paleoecological analyses: challenges to perspectives of lake management.