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Tuesday, February 7 • 1:20pm - 5:00pm
Overview of Symposium (S8). Fate of Freshwater Mussels 20+ Years after the Dreissenid Invasion

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Organizer(s)/Convener(s): 
Diane Waller, US Geological Survey, Upper Midwest Environmental Sciences Center; dwaller@usgs.gov (member of Invasive Mussel Collaborative)
Michelle Bartsch, US Geological Survey, Upper Midwest Environmental Sciences Center; mbartsch@usgs.gov (member of Mussel Coordination Team). 

Abstract: The arrival of dreissenid mussels to the Great Lakes in the late 1980s exacerbated the decline of native freshwater (unionid) mussel communities that were already imperiled from habitat loss and degradation. Dreissenids have since spread throughout the Midwest with varying effects on native mussels, ranging from complete extirpation in some habitats to co-existence in others. The symposium will focus on the state of unionids 20+ years after the initial dreissenid invasion, the future outlook for unionids as dreissenids continue to expand their range, and management actions to prevent and reverse further loss of native communities. Presentations will be invited that document changes in unionid communities from the initial invasion of dreissenids to the present, including examples from habitats in which unionids have been extirpated to those in which they continue to survive. The symposium will continue with presentations on dreissenid control strategies for protection or restoration of unionids, including projects that partner public resource agencies with private landowners to control dreissenid mussels in native mussel habitat. The session will conclude with a moderated discussion to prioritize management needs for dreissenid control in select unionid habitats to protect existing communities or restore extirpated populations.

Tuesday February 7, 2017 1:20pm - 5:00pm
Grand Ballroom A

Attendees (4)