The Antarctic notothenioid fish Pagothenia borchgrevinki is thermally flexible: acclimation changes oxygen consumption

Robinson, Esme; Davison, William

doi:10.1007/s00300-007-0361-4

Cited by 78 publications

(58 citation statements)

References 40 publications

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“…The initial spike in oxidative damage observed in this study along with the increased metabolic rates previously observed within the first week of acclimation (Robinson and Davison, 2008a;Robinson and Davison, 2008b;Strobel et al, 2012;Enzor et al, 2013) may signal a surge in protein synthesis and turnover as the cellular environment is restructured. The slow decline of metabolic rates seen in previous studies, connected with the precipitous drop-off in damaged proteins seen in this study, may in turn signal that the initial energy expenditure has led to a more stable cellular environment.…”

Section: Predicting Winners and Losers In Global Climate Change Scenamentioning

confidence: 49%

“…In addition to changes seen at the cellular level, there is some evidence at the level of the whole organism that performance in these cold-adapted notothenioids may be optimal at elevated temperatures. Davison and colleagues have described similar effects of temperature on the RMR of P. borchgrevinki and also found that elevated temperature increases metabolic scope in these cold-adapted fish, with a maximal factorial scope occurring at +3°C (Seebacher et al, 2005;Lowe and Davison, 2006;Franklin et al, 2007;Robinson and Davison, 2008a;Robinson and Davison, 2008b). Thus, in the context of balancing energy expenditures and protecting metabolic scope, at least some Antarctic fish may perform better under future Southern Ocean conditions than previously predicted.…”

Section: Predicting Winners and Losers In Global Climate Change Scenamentioning

confidence: 74%

“…The effects of increased temperature on Antarctic fish have been well documented (Somero and DeVries, 1967;Forster et al, 1987;Davison et al, 1990;Pörtner, 2008;Robinson and Davison, 2008a;Robinson and Davison, 2008b). At the level of the whole organism, an early study from Somero and DeVries (Somero and DeVries, 1967) illustrated a narrow thermal window exists in which notothenioids can survive; however, more recent studies have shown that notothenioid fishes have retained the capacity to acclimate to increased temperatures (Seebacher et al, 2005;Franklin et al, 2007;Robinson and Davison, 2008a;Robinson and Davison, 2008b;Bilyk and DeVries, 2011;Bilyk et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…At the level of the whole organism, an early study from Somero and DeVries (Somero and DeVries, 1967) illustrated a narrow thermal window exists in which notothenioids can survive; however, more recent studies have shown that notothenioid fishes have retained the capacity to acclimate to increased temperatures (Seebacher et al, 2005;Franklin et al, 2007;Robinson and Davison, 2008a;Robinson and Davison, 2008b;Bilyk and DeVries, 2011;Bilyk et al, 2012). While these studies provide evidence that Antarctic fish are capable of acclimating to an increase in temperature, there is little information about the cost of acclimation on a cellular level.…”

Section: Introductionmentioning

confidence: 99%

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Is warmer better? Decreased oxidative damage in notothenioid fish after long-term acclimation to multiple stressors

Enzor

Place

2014

Journal of Experimental Biology

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Antarctic fish of the suborder Notothenioidei have evolved several unique adaptations to deal with subzero temperatures. However, these adaptations may come with physiological trade-offs, such as an increased susceptibility to oxidative damage. As such, the expected environmental perturbations brought on by global climate change have the potential to significantly increase the level of oxidative stress and cellular damage in these endemic fish. Previous single stressor studies of the notothenioids have shown they possess the capacity to acclimate to increased temperatures, but the cellularlevel effects remain largely unknown. Additionally, there is little information on the ability of Antarctic fish to respond to ecologically relevant environmental changes where multiple variables change concomitantly. We have examined the potential synergistic effects that increased temperature and Ṗ CO2 have on the level of protein damage in Trematomus bernacchii, Pagothenia borchgrevinki and Trematomus newnesi, and combined these measurements with changes in total enzymatic activity of catalase (CAT) and superoxide dismutase (SOD) in order to gauge tissue-specific changes in antioxidant capacity. Our findings indicate that total SOD and CAT activity levels displayed only small changes across treatments and tissues. Short-term acclimation to decreased seawater pH and increased temperature resulted in significant increases in oxidative damage. Surprisingly, despite no significant change in antioxidant capacity, cellular damage returned to near-basal levels, and significantly decreased in T. bernacchii, after long-term acclimation. Overall, these data suggest that notothenioid fish currently maintain the antioxidant capacity necessary to offset predicted future ocean conditions, but it remains unclear whether this capacity comes with physiological trade-offs.

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Section: Predicting Winners and Losers In Global Climate Change Scenamentioning

confidence: 49%

Section: Predicting Winners and Losers In Global Climate Change Scenamentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Is warmer better? Decreased oxidative damage in notothenioid fish after long-term acclimation to multiple stressors

Enzor

Place

2014

Journal of Experimental Biology

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“…Both cardiac function and metabolism were altered in response to acclimation to 4°C for 4-5weeks in the redblooded notothenioid Pagothenia borchgevinki (Franklin et al, 2007;Robinson and Davison, 2008;Seebacher et al, 2005). In addition, previous studies have shown that the CT max of notothenioids is influenced by thermal history and significantly increased by warm acclimation (Bilyk and Devries, 2011;Bilyk and Devries, 2012).…”

Section: Thermal Plasticity Of Antarctic Notothenioidsmentioning

confidence: 96%

Exposure to critical thermal maxima causes oxidative stress in hearts of white- but not red-blooded Antarctic notothenioid fishes

Mueller

Devor

Grim

et al. 2012

Journal of Experimental Biology

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SUMMARYAntarctic icefishes have a significantly lower critical thermal maximum (CT max ) compared with most red-blooded notothenioid fishes. We hypothesized that the lower thermal tolerance of icefishes compared with red-blooded notothenioids may stem from a greater vulnerability to oxidative stress as temperature increases. Oxidative muscles of icefishes have high volume densities of mitochondria, rich in polyunsaturated fatty acids, which can promote the production of reactive oxygen species (ROS). Moreover, icefishes have lower levels of antioxidants compared with red-blooded species. To test our hypothesis, we measured levels of oxidized proteins and lipids, and transcript levels and maximal activities of antioxidants in heart ventricle and oxidative pectoral adductor muscle of icefishes and red-blooded notothenioids held at 0°C and exposed to their CT max . Levels of oxidized proteins and lipids increased in heart ventricle of some icefishes but not in red-blooded species in response to warming, and not in pectoral adductor muscle of any species. Thus, increases in oxidative damage in heart ventricles may contribute to the reduced thermal tolerance of icefishes. Despite an increase in oxidative damage in hearts of icefishes, neither transcript levels nor activities of antioxidants increased, nor did they increase in any tissue of any species in response to exposure to CT max . Rather, transcript levels of the enzyme superoxide dismutase (SOD) decreased in hearts of icefishes and the activity of SOD decreased in hearts of the red-blooded species Gobionotothen gibberifrons. These data suggest that notothenioids may have lost the ability to elevate levels of antioxidants in response to heat stress.

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How will fish that evolved at constant sub‐zero temperatures cope with global warming? Notothenioids as a case study

Patarnello¹,

Verde

Prisco

et al. 2011

BioEssays

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Current climate change has raised concerns over the fate of the stenothermal Antarctic marine fauna (animals that evolved to live in narrow ranges of cold temperatures). The present paper focuses on Notothenioidei, a taxonomic group that dominates Antarctic fish. Notothenioids evolved in the Southern Ocean over the last 20 million years, providing an example of a marine species flock with unique adaptations to the cold at morphological, physiological and biochemical levels. Their phenotypic modifications are often accompanied by 'irreversible' genomic losses or gene amplifications. On a micro-evolutionary scale, relatively 'shallow' genetic variation is observed, on account of past fluctuations in population size, and a significant genetic structure is evident, suggesting low population connectivity. These features suggest that Antarctic fish might have relatively little potential to adapt to global warming, at least at a genetic level. The extent of their phenotypic plasticity, which is evident to some degree, awaits further research.

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The Antarctic notothenioid fish Pagothenia borchgrevinki is thermally flexible: acclimation changes oxygen consumption

Cited by 78 publications

References 40 publications

Is warmer better? Decreased oxidative damage in notothenioid fish after long-term acclimation to multiple stressors

Is warmer better? Decreased oxidative damage in notothenioid fish after long-term acclimation to multiple stressors

Exposure to critical thermal maxima causes oxidative stress in hearts of white- but not red-blooded Antarctic notothenioid fishes

How will fish that evolved at constant sub‐zero temperatures cope with global warming? Notothenioids as a case study

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