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Deciphering lifelong thermal niche using otolith δ18O thermometry within supplemented lake trout (Salvelinus namaycush) populations

Morissette Olivier, Bernatchez Louis, Wiedenbeck Michael et Sirois Pascal. (2020). Deciphering lifelong thermal niche using otolith δ18O thermometry within supplemented lake trout (Salvelinus namaycush) populations. Freshwater Biology, 65, (6), p. 1114-1127.

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URL officielle: https://dx.doi.org/doi:10.1111/fwb.13497

Résumé

1. The selection of thermal habitat by fish is strongly regulated by physiology and behaviour. However, delineation of a species lifelong thermal niche remains tech-nically challenging. Lake trout (Salvelinus namaycush) survival and productivity are recognised as being tightly linked to a somewhat restricted thermal habitat. The factors guiding temperature selection during each life stage remain poorly understood.

2. In this study, we tested the significant factors controlling the realised thermal niche of lake trout from two southern Quebec small boreal lakes that experienced supplementation stocking during the last 20 years. We used oxygen stable isotope (δ18O) thermometry of otolith calcium carbonates (aragonite) using secondary-ion mass spectrometry to estimate experienced lifelong temperatures. We investi-gated the thermal habitat of lake trout with known genotypes (local, hybrid, and stocked).

3. Ontogeny and genetic origin influenced temperature selection in both studied lake trout populations. Young-of-the-year consistently used warmer, shallower habitats (10.7 ± 2.6°C, 7.5 m depth) prior to a juvenile transition to colder and deeper waters (8.5 ± 3.3°C, 10 m depth). Stocked lake trout, originating from a genetically distinct ecotype, exhibited a more variable thermal niche, with some individuals consistently using warmer habitat (10.4 ± 1°C) than local fish. Their hybrid progeny also occupied a warmer thermal niche, intermediate to the paren-tal strains. We propose that increased fat content and genetic origin are potential explanatory factors for warmer temperature use.

4. This study reiterates that high-resolution otolith δ18O thermometry is a uniquely well-suited approach for unravelling the multiple factors that influence lifelong temperature selection in fish. Our results illustrate that the realised thermal niche is influenced by a genetic–environment interaction.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0046-5070
Volume:65
Numéro:6
Pages:p. 1114-1127
Version évaluée par les pairs:Oui
Date:2020
Identifiant unique:10.1111/fwb.13497
Sujets:Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Unités de recherche > Chaire de recherche sur les espèces aquatiques exploitées (CREAE)
Mots-clés:early life, ontogeny, oxygen stable isotopes, secondary-ion mass spectrometry, SIMS, thermal boundaries
Déposé le:26 nov. 2022 20:09
Dernière modification:15 juin 2023 15:50
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