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Cardiac mitochondrial plasticity and thermal sensitivity in a fish inhabiting an artificially heated ecosystem
Univ Moncton, Dept Chem & Biochem, Moncton, NB E1A 3E9, Canada;Univ Gothenburg, Dept Biol & Environm Sci, S-40530 Gothenburg, Sweden;Univ Quebec Rimouski, Dept Biol, Rimouski, PQ G5L 3A1, Canada.
Univ Gothenburg, Dept Biol & Environm Sci, S-40530 Gothenburg, Sweden.
Univ Montreal, Dept Biol Sci, Montreal, PQ H2V 2S9, Canada.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.ORCID iD: 0000-0002-3157-7289
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 17832Article in journal (Refereed) Published
Abstract [en]

Some evidence suggests that cardiac mitochondrial functions might be involved in the resilience of ectotherms such as fish to environmental warming. Here, we investigated the effects of acute and chronic changes in thermal regimes on cardiac mitochondrial plasticity and thermal sensitivity in perch (Perca fluviatilis) from an artificially heated ecosystem; the "Biotest enclosure" (similar to 25 degrees C), and from an adjacent area in the Baltic Sea with normal temperatures (reference, similar to 16 degrees C). We evaluated cardiac mitochondrial respiration at assay temperatures of 16 and 25 degrees C, as well as activities of lactate dehydrogenase (LDH) and citrate synthase (CS) in Biotest and reference perch following 8 months laboratory-acclimation to either 16 or 25 degrees C. While both populations exhibited higher acute mitochondrial thermal sensitivity when acclimated to their natural habitat temperatures, this sensitivity was lost when Biotest and reference fish were acclimated to 16 and 25 degrees C, respectively. Moreover, reference fish displayed patterns of metabolic thermal compensation when acclimated to 25 degrees C, whereas no changes were observed in Biotest perch acclimated to 16 degrees C, suggesting that cardiac mitochondrial metabolism of Biotest fish expresses local adaptation. This study highlights the adaptive responses of cardiac mitochondria to environmental warming, which can impact on fish survival and distribution in a warming climate.

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NATURE PUBLISHING GROUP , 2019. Vol. 9, article id 17832
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Zoology
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URN: urn:nbn:se:uu:diva-400043DOI: 10.1038/s41598-019-54165-3ISI: 000499328600001PubMedID: 31780821OAI: oai:DiVA.org:uu-400043DiVA, id: diva2:1380120
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Swedish Research CouncilSwedish Research Council FormasVinnovaEU, FP7, Seventh Framework ProgrammeAvailable from: 2019-12-18 Created: 2019-12-18 Last updated: 2019-12-18Bibliographically approved

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