EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/22/2018 | 10:00 AM - 10:15 AM | DEPTH AND SEASON-SPECIFIC TRENDS IN INVASIVE QUAGGA MUSSEL GROWTH AND IMPLICATIONS FOR ECOLOGICAL IMPACTS | 430 B
DEPTH AND SEASON-SPECIFIC TRENDS IN INVASIVE QUAGGA MUSSEL GROWTH AND IMPLICATIONS FOR ECOLOGICAL IMPACTS
The introduction of invasive zebra and quagga mussels (Dreissena polymorpha and D. rostriformis bugensis, respectively) has profoundly impacted freshwater ecosystems across North America. The NOAA Great Lakes Environmental Research Laboratory’s annual benthic survey of southern Lake Michigan reveals depth-specific population trajectories for quagga mussels, including declines in biomass at 30-50m and 50-90m and increases at depths >90m. To explore what is influencing these observed patterns, we conducted in situ field experiments to measure quagga mussel growth at multiple time-points over the course of one year and at two depths. The mussels were contained in cages at 45m and 90m in southeastern Lake Michigan. We discovered that a majority of mussel growth occurred during the fall and winter for mussels at 45m, and just the winter for mussels at 90m. Our finding that growth largely occurs following fall turnover suggests that mussels might be impacted by prolonged stratification resulting from warmer surface waters late in the season. Ultimately, the results from these studies will help to elucidate the population trajectories of quagga mussels in Lake Michigan, which can be used to anticipate future ecological impacts.
- Invasive
- Great Lakes
- Monitoring
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Presenters/Authors
Ashley Elgin
(), NOAA Great Lakes Environmental Research Laboratory, ashley.elgin@noaa.gov;
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Paul Glyshaw
(), Cooperative Institute for Great Lakes Research, University of Michigan, pglyshaw@umich.edu;
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