Metabolic adaptation to warm water in fish

Jutfelt, Fredrik

doi:10.1111/1365-2435.13558

Cited by 34 publications

(25 citation statements)

References 30 publications

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“…In the present study, we examined the thermal sensitivity and acclimation potential of Atlantic salmon cardiac mitochondrial function to provide a more comprehensive picture of how acclimation to warm temperatures affects the metabolic capacity of this highly aerobic, moderately eurythermal, fish species at temperatures just below, at, and above their CT Max . The importance of cardiac mitochondrial thermal plasticity for cardiorespiratory performance, and potentially in heart failure, is discussed in the context of climate change and metabolic adaption in fish 2 , 55 .…”

Section: Discussionmentioning

confidence: 99%

Improved mitochondrial function in salmon (Salmo salar) following high temperature acclimation suggests that there are cracks in the proverbial ‘ceiling’

Gerber

Clow

Mark

et al. 2020

Sci Rep

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Mitochondrial function can provide key insights into how fish will respond to climate change, due to its important role in heart performance, energy metabolism and oxidative stress. However, whether warm acclimation can maintain or improve the energetic status of the fish heart when exposed to short-term heat stress is not well understood. We acclimated Atlantic salmon, a highly aerobic eurythermal species, to 12 and 20 °C, then measured cardiac mitochondrial functionality and integrity at 20 °C and at 24, 26 and 28 °C (this species’ critical thermal maximum ± 2 °C). Acclimation to 20 °C vs. 12 °C enhanced many aspects of mitochondrial respiratory capacity and efficiency up to 24 °C, and preserved outer mitochondrial membrane integrity up to 26 °C. Further, reactive oxygen species (ROS) production was dramatically decreased at all temperatures. These data suggest that salmon acclimated to ‘normal’ maximum summer temperatures are capable of surviving all but the most extreme ocean heat waves, and that there is no ‘tradeoff’ in heart mitochondrial function when Atlantic salmon are acclimated to high temperatures (i.e., increased oxidative phosphorylation does not result in heightened ROS production). This study suggests that fish species may show quite different acclimatory responses when exposed to prolonged high temperatures, and thus, susceptibility to climate warming.

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Section: Discussionmentioning

confidence: 99%

Improved mitochondrial function in salmon (Salmo salar) following high temperature acclimation suggests that there are cracks in the proverbial ‘ceiling’

Gerber

Clow

Mark

et al. 2020

Sci Rep

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show abstract

“…Ectotherms possess a suite of cardiorespiratory responses to meet the challenges of changes in temperature and the associated changes in metabolic demand ( Jutfelt, 2020 ; Seebacher et al, 2014 ). Eurythermal fishes who are regularly exposed to frequent thermal variations on tidal, diel, and seasonal time scales, may not experience large impacts of thermal variability on their cardiac performance.…”

Section: Discussionmentioning

confidence: 99%

Effect of thermal variation on the cardiac thermal limits of a eurythermal marine teleost (Girella nigricans)

Schwieterman

Hardison

Eliason

2022

Current Research in Physiology

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“…Here, our results demonstrate that populations with a recent and multigenerational history of exposure to warmer temperatures (i.e., geothermal source populations) display a significantly reduced temperature sensitivity of metabolism. Moreover, at warmer acclimation temperatures, populations with a warmer thermal history show lower metabolic rates than populations from ambient conditions, suggesting that multigenerational processes (e.g., plasticity, adaptation) may counteract the metabolic consequences of temperature rise (Jutfelt, 2020 ; Sandblom et al, 2016 ). Further, we show that boldness and activity were positively related to metabolic rates across individuals from all populations combined at the individual level.…”

Section: Discussionmentioning

confidence: 99%

Multigenerational exposure to increased temperature reduces metabolic rate but increases boldness in Gambusia affinis

Moffett

Fryxell

Simon

2022

Ecology and Evolution

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Acute exposure to warming temperatures increases minimum energetic requirements in ectotherms. However, over and within multiple generations, increased temperatures may cause plastic and evolved changes that modify the temperature sensitivity of energy demand and alter individual behaviors. Here, we aimed to test whether populations recently exposed to geothermally elevated temperatures express an altered temperature sensitivity of metabolism and behavior. We expected that long‐term exposure to warming would moderate metabolic rate, reducing the temperature sensitivity of metabolism, with concomitant reductions in boldness and activity. We compared the temperature sensitivity of metabolic rate (acclimation at 20 vs. 30°C) and allometric slopes of routine, standard, and maximum metabolic rates, in addition to boldness and activity behaviors, across eight recently divergent populations of a widespread fish species (Gambusia affinis). Our data reveal that warm‐source populations express a reduced temperature sensitivity of metabolism, with relatively high metabolic rates at cool acclimation temperatures and relatively low metabolic rates at warm acclimation temperatures compared to ambient‐source populations. Allometric scaling of metabolism did not differ with thermal history. Across individuals from all populations combined, higher metabolic rates were associated with higher activity rates at 20°C and bolder behavior at 30°C. However, warm‐source populations displayed relatively bolder behavior at both acclimation temperatures compared to ambient‐source populations, despite their relatively low metabolic rates at warm acclimation temperatures. Overall, our data suggest that in response to warming, multigenerational exposure (e.g., plasticity, adaptation) may not result in trait change directed along a simple “pace‐of‐life syndrome” axis, instead causing relative decreases in metabolism and increases in boldness. Ultimately, our data suggest that multigenerational warming may produce a novel combination of physiological and behavioral traits, with consequences for animal performance in a warming world.

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Metabolic adaptation to warm water in fish

Cited by 34 publications

References 30 publications

Improved mitochondrial function in salmon (Salmo salar) following high temperature acclimation suggests that there are cracks in the proverbial ‘ceiling’

Improved mitochondrial function in salmon (Salmo salar) following high temperature acclimation suggests that there are cracks in the proverbial ‘ceiling’

Effect of thermal variation on the cardiac thermal limits of a eurythermal marine teleost (Girella nigricans)

Multigenerational exposure to increased temperature reduces metabolic rate but increases boldness in Gambusia affinis

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