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Rainbow trout movement behavior and habitat occupancy are influenced by sex and Pacific salmon presence in an Alaska river system.
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- Author(s): Fraley, Kevin M.; Falke, Jeffrey A.; McPhee, Megan V.; Prakash, Anupma
- Source:
Canadian Journal of Fisheries & Aquatic Sciences; 2018, Vol. 75 Issue 4, p525-537, 13p- Subject Terms:
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- Abstract: We used spatially continuous field-measured and remotely sensed aquatic habitat characteristics paired with weekly ground-based telemetry tracking and snorkel surveys to describe movements and habitat occupancy of adult rainbow trout ( Oncorhynchus mykiss) ( N = 82) in a runoff-fed, salmon-influenced southcentral Alaska river system. We found that during the ice-free feeding season (June through September) rainbow trout occurrence was associated more with fine-scale (channel unit) characteristics relative to coarse-scale (stream reach) variables. The presence of Pacific salmon ( Oncorhynchus spp., which provide an important seasonal food subsidy) and habitat size were particularly useful predictors. Weekly movement distance differed between pre- and postspawning salmon arrival, but did not vary by sex. Habitat quality, season, and the arrival of spawning salmon influenced the likelihood of rainbow trout movement, and fish moved farther to seek out higher-quality habitats. Because rainbow trout respond to habitat factors at multiple scales and seek out salmon-derived subsidies, it will be important to take a multiscale approach in protecting trout and salmon populations and managing the associated fisheries. [ABSTRACT FROM AUTHOR]
- Abstract: Nous avons utilisé des caractéristiques des habitats aquatiques continues dans l'espace mesurées sur le terrain et par télédétection, jumelées à des relevés hebdomadaires par télémétrie au sol et par plongée en apnée pour décrire les déplacements et l'occupation de l'habitat de truites arc-en-ciel adultes ( Oncorhynchus mykiss) ( N = 82) dans un réseau hydrographique influencé par les saumons et alimenté par ruissellement du centre-sud de l'Alaska. Nous avons constaté que, durant la période d'alimentation durant laquelle les eaux sont libres de glace (de juin à septembre), la présence de truites arc-en-ciel était plus fortement associée à des caractéristiques de petite échelle (unité de chenal) que des variables d'échelle plus grande (tronçon de cours d'eau). La présence de saumons du Pacifique ( Oncorhynchus spp., qui fournissent un important apport alimentaire saisonnier) et la taille de l'habitat étaient des prédicteurs particulièrement utiles. La distance de déplacement hebdomadaire était différente entre l'arrivée de saumons pré- et post-frai, mais ne variait pas selon le sexe. La qualité de l'habitat, la saison et l'arrivée des saumons en frai influençaient la probabilité de déplacement des truites arc-en-ciel, et les poissons se déplaçaient sur de plus grandes distances pour trouver des habitats de plus grande qualité. Parce que les truites arc-en-ciel réagissent à des facteurs associés à l'habitat à différentes échelles et qu'elles cherchent des apports provenant des saumons, il est important d'employer une approche multiéchelle pour la protection des populations de truites et de saumons et la gestion des pêches associées. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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