Rusty Crayfish / Microphallus parasite Investigation - NOR_09_11

Purpose

Project Description: A study in 2009 found that a trematode parasite, Microphallus sp., appears to cause reduced rusty crayfish densities in lakes. 79% of lakes with low densities of rusty crayfish had Microphallus present. 92% of lakes with high densities of rusty crayfish had Microphallus absent. Further understanding of this parasite may help explain the distribution of high density rusty crayfish populations and could lead to some management possibilities or use of the parasite as a biocontrol. Proposed work includes: 1. Crayfish trapping at 5 lakes (Middle Eau Claire, Upper St. Croix, Ruth, Long, Butternut) where Microphallus was found to be present, but rusty crayfish densities are uncertain. One overnight trap set would be made at each lake. 2. Crayfish collection at 3 lakes (Whalen, Lac Courte Oreilles, Middle Eau Claire) with different crayfish species infected by Microphallus. Genetic testing of the Microphallus would be done to determine if more than one species of Microphallus is present. 3. Snail collection at 2 lakes (Middle Eau Claire, Plum) with Microphallus to determine the initial snail host. Genetic testing of the released Microphallus cercariae would be done. 4. Attempt to obtain adult Microphallus from a final host. Genetic testing of the specimens would be done. 5. Coordinate and assist with other efforts being planned to investigate Microphallus by the Town of Plum Lake lakes committee and Lindsey Sargent of Notre Dame University. 6. Dr. Robin Overstreet of the Gulf Coast Research Center will examine and prepare specimens submitted, extract DNA, analyze and edit sequences, compare data among samples, and produce a manuscript.

Objective

A study in 2009 found that a trematode parasite, Microphallus sp., appears to cause reduced rusty crayfish densities in lakes. 79% of lakes with low densities of rusty crayfish had Microphallus present. 92% of lakes with high densities of rusty crayfish had Microphallus absent. Further understanding of this parasite may help explain the distribution of high density rusty crayfish populations and could lead to some management possibilities or use of the parasite as a biocontrol.

Outcome

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. 8 2) Number of sampling events associated with project. 8 3) Estimated date when sample collection will be complete. 10/1/2010 4) Estimated date when all data will be entered into appropriate database. 1/31/2011 5) Estimated date when final report will be complete. 3/1/2011

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Targeted Monitoring
Newly Proposed
NOR_09_CMP11
2010
Complete
 
Reports and Documents
 
Activities & Recommendations
Monitoring Ecosystem
Middle Eau Claire Lake (Bayfield Co.) 2742100 Upper St. Croix Lake (Douglas Co.) 2747300 Lake Ruth (Bayfield Co.) 2765900 Long Lake (Chippewa Co.) 2351400 Butternut Lake (Price Co.) 2283300 Plum Lake (Vilas Co.) 1592400 Whalen Lake (Washburn Co.) 2715900 Lac Courte Oreilles (Sawyer Co.) 2390800