Coping with climatic extremes: Dietary fat content decreased the thermal resilience of barramundi (Lates calcarifer)

Isaza, Daniel F. Gomez; Cramp, Rebecca L.; Smullen, Richard P.; Glencross, Brett; Franklin, Craig E.

doi:10.1016/j.cbpa.2019.01.004

Cited by 23 publications

(17 citation statements)

References 58 publications

(77 reference statements)

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“…While we did not observe a diet difference here, diet quality and quantity can alter thermal limits in ectotherms; (Fishes: Hoar and Cottle, 1952;Craig, Neill and Gatlin, 1995;Abdel-Ghany et al, 2019, Gomez et al, 2019Lee et al, 2016;Turko et al, 2020;Woiwode and Adelman, 1992). Most previous studies used formulated diets varying in lipid composition; thus, dietary lipid composition may be a primary factor affecting thermal limits.…”

Section: Thermal Limits Increased With Temperature But Did Not Differ Across Diet Treatmentsmentioning

confidence: 57%

Diet mediates thermal performance traits: implications for marine ectotherms

Hardison

Kraskura

Wert

et al. 2021

Journal of Experimental Biology

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Thermal acclimation is a key process enabling ectotherms to cope with temperature change. To undergo a successful acclimation response, ectotherms require energy and nutritional building blocks obtained from their diet. However, diet is often overlooked as a factor that can alter acclimation responses. Using a temperate omnivorous fish, opaleye (Girella nigricans), as a model system, we tested the hypotheses that 1) diet can impact the magnitude of thermal acclimation responses and 2) traits vary in their sensitivity to both temperature acclimation and diet. We fed opaleye a simple omnivorous diet (ad libitum Artemia sp. and Ulva sp.) or a carnivorous diet (ad libitum Artemia sp.) at two ecologically relevant temperatures (12 and 20°C) and measured a suite of whole animal (growth, sprint speed, metabolism), organ (cardiac thermal tolerance), and cellular-level traits (oxidative stress, glycolytic capacity). When opaleye were offered two diet options compared to one, they had reduced cardiovascular thermal performance and higher standard metabolic rate under conditions representative of the maximal seasonal temperature the population experiences (20°C). Further, sprint speed and absolute aerobic scope were insensitive to diet and temperature, while growth was highly sensitive to temperature but not diet, and standard metabolic rate and maximum heart rate were sensitive to both diet and temperature. Our results reveal that diet influences thermal performance in trait-specific ways, which could create diet trade-offs for generalist ectotherms living in thermally variable environments. Ectotherms that alter their diet may be able to regulate their performance at different environmental temperatures.

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Section: Thermal Limits Increased With Temperature But Did Not Differ Across Diet Treatmentsmentioning

confidence: 57%

Diet mediates thermal performance traits: implications for marine ectotherms

Hardison

Kraskura

Wert

et al. 2021

Journal of Experimental Biology

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“…This was speculated to be the reason for a similar increase in thermal tolerance in wild-caught Drosophila after being brought into the laboratory (Krebs et al , 2001). Diet is also known to modulate the thermal tolerance in fish (Hoar and Cottle, 1952; Gomez Isaza et al , 2019), so the shift from a natural diet to laboratory diet (dry food and artemia) could have increased the thermal tolerance. The laboratory-held fish were fasted for 24 hours prior to testing their thermal tolerance, while the feeding state of the fish in the wild was unknown (but no food was provided during the 6 hours holding period before the CT max test commenced).…”

Section: Discussionmentioning

confidence: 99%

Are model organisms representative for climate change research? Testing thermal tolerance in wild and laboratory zebrafish populations

Morgan

Sundin

Finnøen

et al. 2019

Conservation Physiology

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Model organisms can be useful for studying climate change impacts, but it is unclear whether domestication to laboratory conditions has altered their thermal tolerance and therefore how representative of wild populations they are. Zebrafish in the wild live in fluctuating thermal environments that potentially reach harmful temperatures. In the laboratory, zebrafish have gone through four decades of domestication and adaptation to stable optimal temperatures with few thermal extremes. If maintaining thermal tolerance is costly or if genetic traits promoting laboratory fitness at optimal temperature differ from genetic traits for high thermal tolerance, the thermal tolerance of laboratory zebrafish could be hypothesized to be lower than that of wild zebrafish. Furthermore, very little is known about the thermal environment of wild zebrafish and how close to their thermal limits they live. Here, we compared the acute upper thermal tolerance (critical thermal maxima; CTmax) of wild zebrafish measured on-site in West Bengal, India, to zebrafish at three laboratory acclimation/domestication levels: wild-caught, F1 generation wild-caught and domesticated laboratory AB-WT line. We found that in the wild, CTmax increased with increasing site temperature. Yet at the warmest site, zebrafish lived very close to their thermal limit, suggesting that they may currently encounter lethal temperatures. In the laboratory, acclimation temperature appeared to have a stronger effect on CTmax than it did in the wild. The fish in the wild also had a 0.85–1.01°C lower CTmax compared to all laboratory populations. This difference between laboratory-held and wild populations shows that environmental conditions can affect zebrafish’s thermal tolerance. However, there was no difference in CTmax between the laboratory-held populations regardless of the domestication duration. This suggests that thermal tolerance is maintained during domestication and highlights that experiments using domesticated laboratory-reared model species can be appropriate for addressing certain questions on thermal tolerance and global warming impacts.

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“…Moreover, the AS of 28°C-acclimated fish declined with increasing test temperature as a result of the thermal dependence of _ M O2,standard increasing at a greater rate than that of _ M O2,max . A narrowing of AS has been reported for various fish species exposed acutely to elevated temperatures (Clark et al, 2011;Healy and Schulte, 2012;Nilsson et al, 2009;Rummer et al, 2015), although it is recognised that this pattern does not hold true for all species (Gomez Isaza et al, 2019;Gräns et al, 2014;Poletto et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Evidence for this hypothesis comes from the finding that for some species, oxygen delivery mechanisms are unable to meet oxygen demands at high temperatures because of physiological constraints on cardiac, respiratory and blood-oxygen delivery mechanisms (Adamczewska and Morris, 1994;Anttila et al, 2013;Beers and Sidell, 2011;Ekström et al, 2019;Eliason et al, 2013;Muñoz et al, 2018;Pörtner and Knust, 2007;Sandblom et al, 2016). However, the generality of this concept has been brought into question (Jutfelt et al, 2018) as it is not broadly applicable across species (Gomez Isaza et al, 2019;Gräns et al, 2014;Norin et al, 2014;Poletto et al, 2017), suggesting that mechanisms other than a mismatch in oxygen supply may be at play. Indeed, causal evidence to show that a reduction in oxygen transport (i.e.…”

Section: Introductionmentioning

confidence: 99%

Thermal acclimation offsets the negative effects of nitrate on aerobic scope and performance

Isaza

Cramp

Franklin

2020

Journal of Experimental Biology

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Rising temperatures are set to imperil freshwater fishes as climate change ensues unless compensatory strategies are employed. However, the presence of additional stressors, such as elevated nitrate concentrations, may affect the efficacy of compensatory responses. Here, juvenile silver perch (Bidyanus bidyanus) were exposed to current-day summer temperatures (28°C) or a future climate-warming scenario (32°C) and simultaneously exposed to one of three ecologically relevant nitrate concentrations (0, 50 or 100 mg l−1). We measured indicators of fish performance (growth, swimming), aerobic scope (AS) and upper thermal tolerance (CTmax) to test the hypothesis that nitrate exposure would increase susceptibility to elevated temperatures and limit thermal compensatory responses. After 8 weeks of acclimation, the thermal sensitivity and plasticity of AS and swimming performance were tested at three test temperatures (28, 32, 36°C). The AS of 28°C-acclimated fish declined with increasing temperature, and the effect was more pronounced in nitrate-exposed individuals. In these fish, declines in AS corresponded with poorer swimming performance and a 0.8°C decrease in CTmax compared with unexposed fish. In contrast, acclimation to 32°C masked the effects of nitrate; fish acclimated to 32°C displayed a thermally insensitive phenotype whereby locomotor performance remained unchanged, AS was maintained and CTmax was increased by ∼1°C irrespective of nitrate treatment compared with fish acclimated to 28°C. However, growth was markedly reduced in 32°C-acclimated compared with 28°C-acclimated fish. Our results indicate that nitrate exposure increases the susceptibility of fish to acute high temperatures, but thermal compensation can override some of these potentially detrimental effects.

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Coping with climatic extremes: Dietary fat content decreased the thermal resilience of barramundi (Lates calcarifer)

Cited by 23 publications

References 58 publications

Diet mediates thermal performance traits: implications for marine ectotherms

Diet mediates thermal performance traits: implications for marine ectotherms

Are model organisms representative for climate change research? Testing thermal tolerance in wild and laboratory zebrafish populations

Thermal acclimation offsets the negative effects of nitrate on aerobic scope and performance

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