Dépôt numérique
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Temperature, oxygen and diet modulate gene transcription and metabolic capacities in yellow perch.

Grasset, Julie; Bougas, Bérénice; Campbell, Peter G. C.; Bernatchez, Louis; Couture, Patrice (2014). Temperature, oxygen and diet modulate gene transcription and metabolic capacities in yellow perch. Canadian Journal of Fisheries and Aquatic Sciences / Journal canadien des sciences halieutiques et aquatiques , vol. 71 , nº 11. p. 1635-1641. DOI: 10.1139/cjfas-2014-0059.

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Résumé

To unambiguously interpret the impacts of environmental contamination on fish condition, it is important to understand the confounding effects of natural environmental factors. In this study, we measured the effects of temperature (11°C, 20°C, 28°C), oxygen level and dietary restriction on yellow perch (Perca flavescens) using biometric endpoints, and enzymatic and transcriptomic endpoints in liver. The Fulton condition factor (FCF) and pyloric cæca index were significantly correlated (Spearman coefficient = 0.18; p-value = 0.0002) and decreased under heat stress. Both hypoxia and dietary restriction also negatively affected the FCF. These changes, indicating modifications in growth and energy accumulation, were also detected at the enzymatic level. Glucose-6-phosphate dehydrogenase activity was only affected by temperature while nucleoside diphosphate kinase activity decreased under hypoxic and restricted diet conditions. Temperature stress was also observed at the transcription level for genes associated with energy metabolism, oxidative stress response, and apoptosis. This study will contribute to a better understanding of the influences of natural stressors on these biomarkers of condition and metabolic capacities, which are commonly used in ecotoxicological studies.

Type de document: Article
Mots-clés libres: biometry; diet; ecotoxicology; environmental factor; enzyme activity; gene expression; heat balance; hypoxia; metabolism; oxidation; oxygen; perciform; pollution effect; temperature effect
Centre: Centre Eau Terre Environnement
Date de dépôt: 11 avr. 2018 20:15
Dernière modification: 13 avr. 2018 13:34
URI: http://espace.inrs.ca/id/eprint/3765

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