pdf Phosphorus and phytoplankton dynamics in the Les Cheneaux Islands during a rapid rise in Lake Huron water level

Phosphorus and phytoplankton dynamics in the Les Cheneaux Islands during a rapid rise in Lake Huron water level

Authors: R. A. Smith

Author Affiliation: LCWC

Journal: Unpublished Report; March 2017

Abstract: Nutrient concentration and algal biomass dynamics are reported for multiple sites throughout the Les Cheneaux Islands (LCI) during a three-season period of unprecedented rise in Lake Huron water level which followed aggressive growth of Eurasian watermilfoil (Myriophyllum spicatum), an exotic aquatic macrophyte.
In the same time frame LCI phytoplankton populations decreased fivefold based upon chlorophyll-a concentrations while nutrients in the form of soluble phosphorus doubled. It is not known if the observed shifts in phytoplankton density and phosphorus concentration were in response to an abrupt water level increase, the rapid demise of M. spicatum, a combination of the two, or if a review of LCI water chemistry archive data will exhibit a similar pattern.