Research Update

Effects of Boating on Critical Fish Habitat

Michigan’s bays and channels are ecologically valuable coastal resources that provide nursery areas for fish and resting and feeding areas for migrating waterfowl.

Over the past few decades, this near shore habitat has undergone dramatic changes in response to residential development and increased human activity. Escalating boat traffic and boat sizes compound these impacts, especially in areas with seawalls. According to University of Michigan biologist Paul Webb, waves generated by boats are reflected lakeward, and this magnified turbulence affects the stability of critical fish habitat.

“On sheltered water bodies, these waves are the equivalent of boat-induced storms,” says Webb. “The waves are more frequent and unpredictable for the fish community than naturally occurring storm waves.”

Webb is leading Sea Grant funded research in the Les Cheneaux region of Michigan’s eastern Upper Peninsula to help clarify the link between natural- and human-generated waves on the near shore aquatic environment and fish community response.

Using the principles of fluid dynamics, researchers are comparing wave and water flow patterns on several bays that differ in exposure, bathymetry and boat traffic. In 2005, investigators surveyed contrasting sites at Marquette Bay, Cedarville Channel, Cedarville Bay and Boot Island.

Project results will help guide management and restoration of shoreline habitat to protect and improve biological functions of this important aquatic zone.

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