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Anttila K, Mauduit F, Kanerva M, Götting M, Nikinmaa M, Claireaux G. Cardiovascular oxygen transport and peripheral oxygen extraction capacity contribute to acute heat tolerance in European seabass. Comp Biochem Physiol A Mol Integr Physiol 2023; 275:111340. [PMID: 36347467 DOI: 10.1016/j.cbpa.2022.111340] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 10/23/2022] [Accepted: 11/02/2022] [Indexed: 11/08/2022]
Abstract
This study evaluated whether different parameters describing cardiovascular function, energy metabolism, oxygen transport and oxidative stress were related to the critical thermal maximum (CTMAX) of European seabass (Dicentrarchus labrax) and if there were differential changes in these parameters during and after heat shock in animals with different CTMAX in order to characterize which physiological features make seabass vulnerable to heat waves. Seabass (n = 621) were tested for CTMAX and the physiological parameters were measured in individuals with good or poor temperature tolerance before and after a heat shock (change in temperature from 15 °C to 28 °C in 1.5 h). Fish with good thermal tolerance had larger ventricles with higher maximal heart rate during the heat shock than individuals with poor tolerance. Furthermore, they initially had a high ventricular Ca2+-ATPase activity, which was reduced to a similar level as in fish with poor tolerance following heat shock. The activity of heart lactate dehydrogenase increased in fish with high tolerance, when they were exposed to heat shock, while the aerobic enzyme activity did not differ between groups. The tolerant individuals had smaller red muscle fibers with higher myoglobin content than the poorly tolerant ones. The poorly tolerant individuals had higher hematocrit, which increased with heat shock in both groups. The poorly tolerant individuals had also higher activity of enzymes related to oxidative stress especially after heat shock. In general, CTMAX was not depending on merely one physiological factor but several organ and cellular parameters were related to the CTMAX of seabass and when working in combination they might protect the highly tolerant seabass from future heat waves.
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Affiliation(s)
- Katja Anttila
- Department of Biology, University of Turku, FI-20014 Turku, Finland.
| | - Florian Mauduit
- Université de Bretagne Occidentale, LEMAR (UMR 6539), Unité PFOM-ARN, Centre Ifremer de Bretagne, Plouzané 29280, France
| | - Mirella Kanerva
- Department of Biology, University of Turku, FI-20014 Turku, Finland
| | - Miriam Götting
- Department of Biology, University of Turku, FI-20014 Turku, Finland
| | - Mikko Nikinmaa
- Department of Biology, University of Turku, FI-20014 Turku, Finland
| | - Guy Claireaux
- Université de Bretagne Occidentale, LEMAR (UMR 6539), Unité PFOM-ARN, Centre Ifremer de Bretagne, Plouzané 29280, France
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Pettinau L, Lancien F, Zhang Y, Mauduit F, Ollivier H, Farrell AP, Claireaux G, Anttila K. Warm, but not hypoxic acclimation, prolongs ventricular diastole and decreases the protein level of Na +/Ca 2+ exchanger to enhance cardiac thermal tolerance in European sea bass. Comp Biochem Physiol A Mol Integr Physiol 2022; 272:111266. [PMID: 35772648 DOI: 10.1016/j.cbpa.2022.111266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 06/24/2022] [Accepted: 06/24/2022] [Indexed: 10/17/2022]
Abstract
One of the physiological mechanisms that can limit the fish's ability to face hypoxia or elevated temperature, is maximal cardiac performance. Yet, few studies have measured how cardiac electrical activity and associated calcium cycling proteins change with acclimation to those environmental stressors. To examine this, we acclimated European sea bass for 6 weeks to three experimental conditions: a seasonal average temperature in normoxia (16 °C; 100% air sat.), an elevated temperature in normoxia (25 °C; 100% air sat.) and a seasonal average temperature in hypoxia (16 °C; 50% air sat.). Following each acclimation, the electrocardiogram was measured to assess how acclimation affected the different phases of cardiac cycle, the maximal heart rate (fHmax) and cardiac thermal performance during an acute increase of temperature. Whereas warm acclimation prolonged especially the diastolic phase of the ventricular contraction, reduced the fHmax and increased the cardiac arrhythmia temperature (TARR), hypoxic acclimation was without effect on these functional indices. We measured the level of two key proteins involved with cellular relaxation of cardiomyocytes, i.e. sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA) and Na+/Ca2+ exchanger (NCX). Warm acclimation reduced protein level of both NCX and SERCA and hypoxic acclimation reduced SERCA protein levels without affecting NCX. The changes in ventricular NCX level correlated with the observed changes in diastole duration and fHmax as well as TARR. Our results shed new light on mechanisms of cardiac plasticity to environmental stressors and suggest that NCX might be involved with the observed functional changes, yet future studies should also measure its electrophysiological activity.
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Affiliation(s)
- Luca Pettinau
- Department of Biology, University of Turku, 20014 Turku, Finland.
| | - Frédéric Lancien
- Université de Bretagne Occidentale, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France
| | - Yangfan Zhang
- Department of Zoology, Faculty of Land and Food System, University of British Columbia, Vancouver, British Columbia, Canada. https://twitter.com/theYangfanZHANG
| | - Florian Mauduit
- Université de Bretagne Occidentale, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France
| | - Hélène Ollivier
- Université de Bretagne Occidentale, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France
| | - Anthony P Farrell
- Department of Zoology, Faculty of Land and Food System, University of British Columbia, Vancouver, British Columbia, Canada
| | - Guy Claireaux
- Université de Bretagne Occidentale, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France
| | - Katja Anttila
- Department of Biology, University of Turku, 20014 Turku, Finland. https://twitter.com/anttilaLab
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Hollins J, Thambithurai D, Koeck B, Crespel A, Bailey DM, Cooke SJ, Lindström J, Parsons KJ, Killen SS. A physiological perspective on fisheries-induced evolution. Evol Appl 2018; 11:561-576. [PMID: 29875803 PMCID: PMC5978952 DOI: 10.1111/eva.12597] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 12/22/2017] [Accepted: 01/08/2018] [Indexed: 02/06/2023] Open
Abstract
There is increasing evidence that intense fishing pressure is not only depleting fish stocks but also causing evolutionary changes to fish populations. In particular, body size and fecundity in wild fish populations may be altered in response to the high and often size‐selective mortality exerted by fisheries. While these effects can have serious consequences for the viability of fish populations, there are also a range of traits not directly related to body size which could also affect susceptibility to capture by fishing gears—and therefore fisheries‐induced evolution (FIE)—but which have to date been ignored. For example, overlooked within the context of FIE is the likelihood that variation in physiological traits could make some individuals within species more vulnerable to capture. Specifically, traits related to energy balance (e.g., metabolic rate), swimming performance (e.g., aerobic scope), neuroendocrinology (e.g., stress responsiveness) and sensory physiology (e.g., visual acuity) are especially likely to influence vulnerability to capture through a variety of mechanisms. Selection on these traits could produce major shifts in the physiological traits within populations in response to fishing pressure that are yet to be considered but which could influence population resource requirements, resilience, species’ distributions and responses to environmental change.
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Affiliation(s)
- Jack Hollins
- Institute of Biodiversity, Animal Health and Comparative Medicine University of Glasgow Glasgow UK
| | - Davide Thambithurai
- Institute of Biodiversity, Animal Health and Comparative Medicine University of Glasgow Glasgow UK
| | - Barbara Koeck
- Institute of Biodiversity, Animal Health and Comparative Medicine University of Glasgow Glasgow UK
| | - Amelie Crespel
- Institute of Biodiversity, Animal Health and Comparative Medicine University of Glasgow Glasgow UK
| | - David M Bailey
- Institute of Biodiversity, Animal Health and Comparative Medicine University of Glasgow Glasgow UK
| | - Steven J Cooke
- Fish Ecology and Conservation Physiology Laboratory Department of Biology and Institute of Environmental Science Carleton University Ottawa ON Canada
| | - Jan Lindström
- Institute of Biodiversity, Animal Health and Comparative Medicine University of Glasgow Glasgow UK
| | - Kevin J Parsons
- Institute of Biodiversity, Animal Health and Comparative Medicine University of Glasgow Glasgow UK
| | - Shaun S Killen
- Institute of Biodiversity, Animal Health and Comparative Medicine University of Glasgow Glasgow UK
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