**ABSTRACT NOT FOR CITATION WITHOUT AUTHOR PERMISSION. The title, authors, and abstract for this completion report are provided below. For a copy of the full completion report, please contact the author via e-mail at jaustin@d.umn.edu. Questions? Contact the GLFC via email at frp@glfc.org or via telephone at 734-662-3209.**
Reproductive behavior of wild and hatchery
lake trout in the Drummond Island Refuge, Lake Huron: Modeling and physical
observations component
Austin, J. A.1
1Large
Lakes Observatory
University of Minnesota
Duluth, MN 55812
April 2015
ABSTRACT:
As an addendum to
acoustic fishery work performed in the vicinity of Drummond Island, we made
observations of physical parameters and configured a numerical model to help to
put bio-acoustic observations into a broader context. Observations consisted of deployments of
thermistors during the 2012, 2013, and 2014 field seasons coincident with a
subset of the acoustic array, as well as the deployment of an acoustic Doppler
current meter (ADCP) at a single site in 2013. The thermistor array provided
data on temperature along the lake floor in the vicinity of the deployment. A
clear seasonal signal is present, along with indications of lateral motion,
undulations of the thermocline, and a weak near-inertial signal in the vicinity
of the thermocline. ADCP observations showed activity in three spectral bands:
the near –inertial band (~16h) associated with the rotation of the earth,
diurnal tides (24h), and the primary Helmholtz mode (~67h), which represents
the exchange of water between Lakes Michigan and Huron.
A numerical model was
configured to simulate circulation in the vicinity of the study site; the model
consisted of a fully but coarsely resolved Lake Huron and