2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 11:45 AM - 12:00 PM | POPULATION DYNAMICS OF NEW ZEALAND MUD SNAILS IN A NORTHERN MICHIGAN STREAM | 430 B
POPULATION DYNAMICS OF NEW ZEALAND MUD SNAILS IN A NORTHERN MICHIGAN STREAM
New Zealand mud snails (NZMS) were identified from samples collected from the East Branch Au Sable River in May 2015 during routine macroinvertebrate surveys. Consequently, we conducted two (May and August) macroinvertebrate surveys during 2016 and three surveys (February, May, and August) during 2017 to quantify NZMS abundance and track macroinvertebrate communities. Results indicate that NZMS density in the lower East Branch Au Sable River has increased relatively rapidly, reaching over 30,000 m2 in three years. When comparing just May samples or August samples, NZMS densities have increased each year. Populations persisted through the winter at 15,000 m2, primarily as juveniles. NZMS have spread downstream to the Main Branch of the Au Sable where densities have increased more slowly. In the Main Branch above the East Branch confluence, densities have remained very low. Non-NZMS invertebrate densities in the lower East Branch Au Sable initially increased (May 2016) then decreased (May 2017) to near 2015 densities. At current NZMS densities, non-NZMA invertebrate densities appear to be stable, but nutrient discharge from an aquaculture facility has increased algal production and may moderate their response.
- Invertebrate
- Population
- Periphyton
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Presenters/Authors
Mark Luttenton
(), Annis Water Resources Institute, Grand Valley State University, luttentm@gvsu.edu;
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Justin Wegner
(), Annis Water Resources Institute, Grand Valley State University, wegnerju@mail.gvsu.edu;
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