Edwards, W. J. The Ohio State University, edwards.196@osu.edu
Culver, D. J. The Ohio State University, culver.3@osu.edu

 
THE ROLE OF TURBULENT MIXING IN BENTHIC-PELAGIC COUPLING IN THE WESTERN BASIN OF LAKE ERIE (USA)
 
In the western basin of Lake Erie, zebra mussels represent a large benthic biomass (150 g dry soft tissue/m2 at our site). However, their ability to impact the algal supply in the pelagic depends on the delivery of pelagic phytoplankton to the zebra mussels in the benthic boundry layer. To investigate this rate of delivery, we measured three-dimensional velocities in 25 cm intervals from the bottom to 3 m at our site with an acoustic doppler profiler (ADP), measured vertical phytoplankton distributions and deployed growth cages with zebra mussels throughout the summer. We used the velocity data to calculate the friction (shear) velocity, u*, and the roughness length z0 and from these quantities calculated the turbulent diffusisvity, K(z), with respect to depth. Using both the vertical profiles of phytoplankton and seasonal vertical distributions of phytoplankton provided by growth cage data with a bioenergetics model, we calculated the flux of phytoplankton into the boudry layer during the growing season. We will compare the algal depletion caused by zebra mussels to production and the impacts of other filter feeders, helping to determine the relative importance of the mussels in the ecosystem.
 
Day: Wednesday, Feb. 3
Time: 09:45 - 10:00am
Location: Eldorado Hotel
 
Code: SS03WE0945E