Abstract
Movements and dispersal distances of acoustically-tagged adult lake charr Salvelinus namaycush were estimated based on detections at acoustic receivers in Lake Huron during 2010–2014. Most lake charr were detected only at receivers proximate to their release location or were not detected at all, but 3–9% of tagged lake charr were detected at receivers located over 100 km from their release location. Several fish made extensive repeated migrations within the lake, some at the scale of the entire main basin. Our observations show that some lake charr individuals repeat a similar pattern each year of moving long distances, and some fish were observed to show annual fidelity to presumed foraging sites in the spring at a spatial scale of approximately 200 km. Our telemetry-based estimates were minimum estimates of dispersal, as the placement of receivers within Lake Huron was not optimal for detection of lake charr and did not cover the majority of the lake. Further study of long-distance movement in lake charr is necessary to fully understand the implications of this behavior to lake charr ecology, population dynamics, and management in the Great Lakes.
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Acknowledgments
We thank E. Larson, H. Thompson, C. Wright, L. Lesmeister, D. Operhall, B. Lamoreux, Z. Wickert, J. Osga, Z. Holmes, J. Hinderer, S. Farha, R. Darnton, K. Smith, and P. Wigren for assistance with field work. Lake charr were provided by P. Barbeaux and the Chippewa Ottawa Resource Authority (thanks to M. Ebener, R. Reining, A. Handziak, and D. Pine). A. Cottrill and M. Vinson provided valuable technical reviews of a previous version of this manuscript. This work was funded by the Great Lakes Fishery Commission through Great Lakes Restoration Initiative appropriations (GL-00E23010-3). This paper is contribution 47 of the Great Lakes Acoustic Telemetry Observation System (GLATOS). All sampling and handling of fish were carried out in accordance with guidelines for the care and use of fishes by the American Fisheries Society. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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Riley, S.C., Binder, T.R., Tucker, T.R. et al. Evidence of repeated long-distance movements by lake charr Salvelinus namaycush in Lake Huron. Environ Biol Fish 101, 531–545 (2018). https://doi.org/10.1007/s10641-018-0714-6
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DOI: https://doi.org/10.1007/s10641-018-0714-6