We thank C. Vacek, P. Chivala, and R. Newman for help with fieldwork. Funding
was provided by the South Dakota Department of Game, Fish, and Parks through
Federal Aid in Sport Fish Restoration Project Number F-15-R, Study Number 1563.
The South Dakota Cooperative Fish and Wildlife Research Unit is jointly sponsored
by the U. S. Geological Survey, South Dakota Division of Wildlife, Wildlife
Management Institute, and South Dakota State University.
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