ABSTRACT
North-temperate freshwater systems throughout North America and Europe have experienced a number of anthropogenic drivers during the twentieth century. These systems have experienced: (1) excessive phosphorus loading or eutrophication that can promote nuisance levels of phytoplankton and consequently limit water clarity and reduce bottom dissolved oxygen levels (Smith 2003); (2) a subsequent reduction in phosphorus levels via nutrient abatement programs that has been termed oligotrophication (e.g., Sommer et al.
