Abstract
Fish die-offs during warming events have rarely or ever been recorded within arctic watersheds. The 2001 mortality of anadromous brook charr (Salvelinus fontinalis) in the Sutton River in the Hudson Bay Lowlands may be the first documented case of an increasing number of such events, as climate warming affects north latitude systems. Warm air temperatures (daily maximums >30°C) combined with unusual thermal stratification conditions in the upstream lake appeared to have created the lethal conditions, but changing marine environments likely triggered the event. This highly productive brook charr population depends heavily on the local marine environment, not only for food, but also to moderate the continental climate of the region. The steadily shortening ice season in Hudson Bay appears to be greatly increasing the vulnerability of anadromous stocks to warming events.
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Guest editors: C. Adams, E. Brännas, B. Dempson, R. Knudsen, I. McCarthy, M. Power, I. Winfield / Developments in the Biology, Ecology and Evolution of Charr
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Gunn, J., Snucins, E. Brook charr mortalities during extreme temperature events in Sutton River, Hudson Bay Lowlands, Canada. Hydrobiologia 650, 79–84 (2010). https://doi.org/10.1007/s10750-010-0201-3
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DOI: https://doi.org/10.1007/s10750-010-0201-3