Abstract
In Arctic Alaska the anadromous char, Dolly Varden Salvelinus malma is a highly important subsistence fish to local residents living subsistence-based lifestyles. While in the ocean, very little is known about the marine ecology of Dolly Varden. Therefore, to examine this species’ marine habitat occupancy, dispersal, and behavior, we attached pop-up satellite archival tags (PSATs) to Dolly Varden (n = 52) outmigrating from a river, which flows into the Arctic Ocean. Seven tagged fish demonstrated the first documented northwesterly dispersal to offshore areas of the Russian Chukchi Sea. While at sea, these fish demonstrated transits of 30–60 km·day−1, affinity for the first 5 m of the water column, and diel patterns in depth occupancy, while experiencing a thermal environment of generally 3–7 °C. Eight other fish likely occupied nearshore waters of northwestern Alaska. These nearshore dispersers all experienced highly fluctuating daily temperatures (0–15 °C), shallow depths (< 6 m), and appeared to quickly transit in a southerly direction. Because of its ability to rapidly transit broad areas of the Outer Continental Shelf, in addition to its frequent occupation of shallow water, Dolly Varden may be exposed to increased emerging human activities in the Arctic Ocean, such as hydrocarbon development and shipping.
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Acknowledgments
Study collaboration and funding was provided in part by the U.S. Department of Interior, Bureau of Ocean Energy Management Environmental Studies Program through the University of Alaska Fairbanks Coastal Marine Institute (BOEM Cooperative Agreement M12AC00006). Generous in-kind/matching funds were provided by Red Dog Mine operated by Teck, Inc., the Alaska Department of Fish and Game, and the University of Alaska Fairbanks School of Fisheries and Ocean Sciences. Invaluable student funding for Michael Courtney was provided by the University of Alaska Fairbank’s Undergraduate Research & Scholarly Activity, Pollock Conservation Cooperative Research Center, and the Rasmuson Fisheries Research Center. Finally, we thank Chris Zimmerman, Matt Evenson, Tom Taube, Mark Evans, Chris Eckert, Rebecca Hager, the employees and contractors of Red Dog Mine, and the residents of Kivalina, AK for their generous support.
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Courtney, M.B., Scanlon, B.S., Rikardsen, A.H. et al. Marine behavior and dispersal of an important subsistence fish in Arctic Alaska, the Dolly Varden. Environ Biol Fish 99, 209–222 (2016). https://doi.org/10.1007/s10641-015-0468-3
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DOI: https://doi.org/10.1007/s10641-015-0468-3