Status and movement of adfluvial brook trout Salvelinus fontinalis at Isle Royale,Michigan, Lake Superior |
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| Affiliation: | 1. U.S. Fish and Wildlife Service, Lower Mississippi River Fish and Wildlife Conservation Office, 111 E. Elizabeth St., Tupelo, MS 38804, United States;2. U.S. Fish and Wildlife Service, Ashland Fish and Wildlife Conservation Office, 2800 Lake Shore Dr. E. Ashland, Wisconsin 54806, United States;1. Department of Geography, Environment, and Spatial Sciences, Michigan State University, Geography Building, 673 Auditorium Rd, East Lansing, MI 48824, United States;1. Department of Environmental Science, Penn State Erie – The Behrend College, Erie, PA 16563, USA;2. Dutton e-Education Institute, Penn State University, University Park, PA 16802, USA;1. Illinois State Geological Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, 701 North Point Drive, Winthrop Harbor, IL 60096, USA;2. Department of Chemical and Biological Sciences, Youngstown State University, One University Plaza, Youngstown, OH 44555, USA;3. Department of Geography and the Environment, Suite G67, Mendel Science Center, Villanova University, 800 E. Lancaster Avenue, Villanova, PA 19085, USA;1. University of Notre Dame, Department of Biological Sciences, 100 Galvin Life Sciences Center, Notre Dame, IN 46556, USA;2. Northern Michigan University, Department of Biology, 1401 Presque Isle Avenue, Marquette, MI 49855, USA;3. U.S. Geological Survey, Great Lakes Science Center, 1451 Green Road, Ann Arbor, MI 48105, USA;1. School of the Environment, University of Windsor, Windsor, Ontario N9J 3C5, Canada;2. Great Lakes Institute for Environmental Research (GLIER), University of Windsor, Windsor, Ontario N9J 3C5, Canada |
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| Abstract: | Adfluvial brook trout Salvelinus fontinalis populations in the Lake Superior basin have suffered declines over the last century due to habitat degradation and exploitation. Natural resources agencies throughout the basin have restored habitat and implemented restrictive angling regulations as tools to protect remnant coaster brook trout populations, but the success of these practices is unknown in some locations. We used electrofishing and passive integrated transponder (PIT) tag movement data from 2008 to 2020 to describe population characteristics, temporal trends, and adfluvial life history of coaster brook trout in Washington Harbor, Isle Royale National Park, Lake Superior after implementation of catch-and-release regulations in 2004. Our results document the presence of an adfluvial coaster brook trout population in Washington Harbor, Isle Royale. Temporal trends indicate that brook trout abundance and distribution in Washington Harbor increased since earlier observations in the late 1990s and early 2000s likely due to enactment of protective regulations, and increased stream flows and water levels observed in recent years in both Washington Creek and Lake Superior, respectively. Annual tag detection of Washington Harbor brook trout in Washington Creek at the antenna arrays varied from 25% in 2009 to 100% in 2011 and 2013, and averaged 60.7% throughout the study. Peak in adfluvial brook trout use of Washington Creek was from August – October with few detections occurring outside of the presumed spawning period. This study provides valuable insight into the population characteristics, movement patterns, and temporal increase in abundance of an adfluvial brook trout population in Lake Superior. |
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| Keywords: | Brook trout Coaster Lake Superior |
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