Eagle Lake Plankton Monitoring SER 1_11


Project Description: Continue planktonic community assessment of Eagle Lake to document planktonic response to bio-manipulation. Samples from three different locations on the lake will be taken on a bi-weekly basis, July - August, 2010. Phytoplankton communities will be analyzed by Dawn Perkins of the SLOH, and zooplankton communities will be analyzed by Paul Garrison of WDNR. Identification will be to species level where possible, and in the case of zooplankton, include length.


Project Justification: In the fall of 2008, Eagle Lake, in Racine County, was treated with the piscicide rotenone in an effort to control an overabundance of panfish. Zooplankton predation by these panfish likely contributed to poor water clarity. Post-rotenone, the fisheries community of the lake is being managed to maximize zooplankton populations, and to maintain clear water conditions. One season of plankton sampling was completed prior to treatment, and one full season has been completed since. This sampling project is proposed in order to expand the data set to include the late summer plankton community of 2010. The research questions to be answered by this study include the following: 1) Abundance and size structure of zooplankton and phytoplankton in the traditionally "clear water" phase time of year (mid-April through June). 2) How the macrophytic response of the lake compares to the plankton assemblage during the clear water phase. 3) Evaluation of the success or failure of the on-going biomanipulation in mid to late summer, based on the abundance, size structure and species of zooplankton in the lake. 4) Assessing the balance between phytoplankton and blue green algae in mid to late summer as a result of the restoration project.


Performance Measures: These are milestones that will be reported on in the Division Quarterly Report. Please estimate dates in a manner that encourages success. 1) Number of sample sites associated with the project: 3 2) Number of sampling events associated with project: 4 3) Estimated date when sample collection will be complete: 09/01/2010 4) Estimated date when all data will be entered into appropriate database: 03/15/2011 5) Estimated date when final report will be complete: 06/01/2011

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Eagle Lake - Racine County WBIC: 759800