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Main Library
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Elevated temperature and deposited sediment jointly affect early life history traits in southernmost Arctic char populations.
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- Author(s): Mari, Lisandrina (AUTHOR); Daufresne, Martin (AUTHOR); Guillard, Jean (AUTHOR); Evanno, Guillaume (AUTHOR); Lasne, Emilien (AUTHOR)
- Source:
Canadian Journal of Fisheries & Aquatic Sciences. 2021, Vol. 78 Issue 6, p744-751. 8p. - Source:
- Additional Information
- Subject Terms:
- Abstract: The combination of global warming and local stressors can have dramatic consequences on freshwater biota. Sediment deposition is an important pressure that can affect benthic species and benthic ontogenetic stages (eggs and larvae) habitat quality. However, knowledge on the effects of sediment in a warming context is lacking. We used a common garden approach to examine the effects of combined exposure to elevated temperature and deposited sediment on early life history traits in offspring of four wild Arctic char (Salvelinus alpinus) populations, originating from geographically isolated lakes at the southern edge of the species range. We report interactive effects of temperature and sediment, with higher temperature exacerbating the negative effects of sediments on the duration of the incubation period and on the body size – yolk expenditure trade-off during development. Our results highlight that reevaluating the impacts of sediment on organisms under the lens of global warming and at the scale of several wild populations is needed to improve our understanding of how vulnerable species can respond to environmental changes. [ABSTRACT FROM AUTHOR]
- Abstract: La combinaison du réchauffement planétaire et de facteurs de stress locaux peut avoir des conséquences dramatiques sur le biote d'eau douce. Le dépôt de sédiments exerce une importante pression qui peut avoir une incidence sur les espèces benthiques et la qualité de l'habitat de différents stades ontogénétiques (œufs et larves) d'organismes benthiques. Les connaissances sur les effets des sédiments dans un contexte de réchauffement manquent toutefois. Nous utilisons une approche de jardin commun pour examiner les effets de l'exposition combinée à des températures accrues et à des sédiments sur des caractères des premières étapes du cycle biologique de la progéniture de quatre populations sauvages d'ombles chevaliers (Salvelinus alpinus) issus de lacs isolés géographiquement situés à la limite sud de l'aire de répartition de l'espèce. Nous faisons état d'effets interactifs de la température et des sédiments, des températures élevées exacerbant les effets négatifs des sédiments sur la durée de la période d'incubation et sur le compromis entre la taille du corps et l'utilisation du vitellus durant le développement. Nos résultats soulignent le fait qu'il est nécessaire de réévaluer les impacts des sédiments sur les organismes dans une optique du réchauffement planétaire et à l'échelle de plusieurs populations sauvages, afin d'améliorer la compréhension des réactions possibles d'espèces vulnérables aux changements environnementaux. [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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