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Understanding summertime thermal refuge use by adult Atlantic salmon using remote sensing, river temperature monitoring, and acoustic telemetry.

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Frechette, Danielle M.; Dugdale, Stephen J.; Dodson, Julian J.; Bergeron, Normand (2018). Understanding summertime thermal refuge use by adult Atlantic salmon using remote sensing, river temperature monitoring, and acoustic telemetry. Canadian Journal of Fisheries and Aquatic Sciences / Journal canadien des sciences halieutiques et aquatiques , vol. 74 , nº 11. p. 1999-2019. DOI: 10.1139/cjfas-2017-0422.

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Résumé

Adult Atlantic salmon return to natal rivers several months before spawning, and during summer, can be subjected to temperatures that exceed their upper temperature tolerance limits. Salmon use thermal refuges to minimize exposure to high temperatures, but little information exists regarding behavioral thermoregulation by adult Atlantic salmon. We examined behavioral thermoregulation by Atlantic salmon during summer in-river residence in a Quebec river with a novel combination of thermal infrared (TIR) remote sensing, river temperature monitoring, and acoustic telemetry. Adults engaged in behavioural thermoregulation at cooler ambient river temperatures (17-19◦C) than previously recorded for this species and maintained body temperature within a narrow range (16-20◦C) via use of cool and warm refuges. Adults used large, stable, stratified pools as refuges, allowing multiple individuals to thermoregulate simultaneously without leaving the pool. Low river discharge and high temperatures can be physical barriers to salmon migration, preventing them from accessing suitable refuges (e.g. pools). Identifying and maintaining connectivity to thermal refuges may be critical for persistence of Atlantic salmon populations as climate changes and rivers warm.

Type de document: Article
Mots-clés libres: Salmo salar; Sauon atlantiqyue; tolérance thermique; température de l'eau; rivière; Québec;
Centre: Centre Eau Terre Environnement
Date de dépôt: 27 août 2018 20:41
Dernière modification: 12 déc. 2018 16:13
URI: http://espace.inrs.ca/id/eprint/7135

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