<i>In situ</i>cardiac performance of Pacific bluefin tuna hearts in response to acute temperature change

Blank, Jason M.; Morrissette, Jeffery M.; Landeira-Fernandez, Ana M.; Blackwell, Susanna B.; Williams, Thomas D.; Block, Barbara A.

doi:10.1242/jeb.00820

Cited by 122 publications

(108 citation statements)

References 63 publications

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“…A further mechanism could be a reduction in enzymatic efficiency at lower temperatures, leading to higher aerobic costs and increased thermogenesis. Cooler temperatures are also associated with bradycardia, which may result in lowered cardiac output and reduced rates of oxygen delivery to the digestive tissues, and consequently a lower rate of food metabolism (Blank et al, 2004). Our results also indicate that there may be an interaction between ambient temperature and diet; we found that temperature had a larger effect on HIF for sardine meals than for squid meals, although this interaction was not significant.…”

Section: Discussionmentioning

confidence: 43%

Quantifying energy intake in Pacific bluefin tuna (Thunnus orientalis) using the heat increment of feeding

Whitlock

Walli

Cermeño

et al. 2013

Journal of Experimental Biology

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SUMMARYUsing implanted archival tags, we examined the effects of meal caloric value, food type (sardine or squid) and ambient temperature on the magnitude and duration of the heat increment of feeding in three captive juvenile Pacific bluefin tuna. The objective of our study was to develop a model that can be used to estimate energy intake in wild fish of similar body mass. Both the magnitude and duration of the heat increment of feeding (measured by visceral warming) showed a strong positive correlation with the caloric value of the ingested meal. Controlling for meal caloric value, the extent of visceral warming was significantly greater at lower ambient temperature. The extent of visceral warming was also significantly higher for squid meals compared with sardine meals. By using a hierarchical Bayesian model to analyze our data and treating individuals as random effects, we demonstrate how increases in visceral temperature can be used to estimate the energy intake of wild Pacific bluefin tuna of similar body mass to the individuals used in our study. Supplementary material available online at

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Section: Discussionmentioning

confidence: 43%

Quantifying energy intake in Pacific bluefin tuna (Thunnus orientalis) using the heat increment of feeding

Whitlock

Walli

Cermeño

et al. 2013

Journal of Experimental Biology

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“…Both the aerobic scope (e.g. Brett, 1962;Ultsch et al, 1980;McKenzie et al, 2012;Eliason et al, 2013a;Killen et al, 2014;Del Raye and Weng, 2015) and ƒ H (Stillman, 2002;Blank et al, 2004;Braby and Somero, 2006;Franklin et al, 2007;Sidhu et al, 2014;Chen et al, 2013;Verhille et al, 2013;Anttila et al, 2014;Ferreira et al, 2014) measurements have been reinstituted to investigate the thermal niches of fishes in this era of rapid climate change. We tested the hypothesis that the cardio-respiratory system of B. saida would thermally acclimate at 0.5, 3.5 and 6.5°C.…”

Section: Introductionmentioning

confidence: 99%

Acclimation potential of Arctic cod (Boreogadus saida Lepechin) from the rapidly warming Arctic Ocean

Drost

Carmack

et al. 2016

Journal of Experimental Biology

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As a consequence of the growing concern about warming of the Arctic Ocean, this study quantified the thermal acclimation responses of Boreogadus saida, a key Arctic food web fish. Physiological rates for cardio-respiratory functions as well as critical maximum temperature (T c,max ) for loss of equilibrium (LOE) were measured. The transition temperatures for these events (LOE, the rate of oxygen uptake and maximum heart rate) during acute warming were used to gauge phenotypic plasticity after thermal acclimation from 0.5°C up to 6.5°C for 1 month (respiratory and T c,max measurements) and 6 months (cardiac measurements). T c,max increased significantly by 2.3°C from 14.9°C to 17.1°C with thermal acclimation, while the optimum temperature for absolute aerobic scope increased by 4.5°C over the same range of thermal acclimation. Warm acclimation reset the maximum heart rate to a statistically lower rate, but the first Arrhenius breakpoint temperature during acute warming was unchanged. The hierarchy of transition temperatures was quantified at three acclimation temperatures and was fitted inside a Fry temperature tolerance polygon to better define ecologically relevant thermal limits to performance of B. saida. We conclude that B. saida can acclimate to 6.5°C water temperatures in the laboratory. However, at this acclimation temperature 50% of the fish were unable to recover from maximum swimming at the 8.5°C test temperature and their cardio-respiratory performance started to decline at water temperatures greater than 5.4°C. Such costs in performance may limit the ecological significance of B. saida acclimation potential.

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“…The thermal sensitivity of the tuna heart may therefore limit the niche occupied by tunas [6]. Indeed, cooling causes bradycardia and an associated reduction in cardiac output in bluefin and yellowfin (T. albacares) tunas [7,8]. However, the Pacific bluefin tuna heart generates greater contractile force and maintains cardiac rhythm at colder temperatures than its tropical sister taxa [7,9].…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, cooling causes bradycardia and an associated reduction in cardiac output in bluefin and yellowfin (T. albacares) tunas [7,8]. However, the Pacific bluefin tuna heart generates greater contractile force and maintains cardiac rhythm at colder temperatures than its tropical sister taxa [7,9]. Understanding cardiac thermal sensitivity in the tunas may help to delineate the key steps that protect cardiac function in the cold.…”

Section: Introductionmentioning

confidence: 99%

Warm fish with cold hearts: thermal plasticity of excitation–contraction coupling in bluefin tuna

et al. 2010

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Bluefin tuna have a unique physiology. Elevated metabolic rates coupled with heat exchangers enable bluefin tunas to conserve heat in their locomotory muscle, viscera, eyes and brain, yet their hearts operate at ambient water temperature. This arrangement of a warm fish with a cold heart is unique among vertebrates and can result in a reduction in cardiac function in the cold despite the elevated metabolic demands of endothermic tissues. In this study, we used laser scanning confocal microscopy and electron microscopy to investigate how acute and chronic temperature change affects tuna cardiac function. We examined the temporal and spatial properties of the intracellular Ca ] i , indicating that temperature change limits cardiac myocyte performance. Importantly, we show that thermal acclimation offered partial compensation for these direct effects of temperature. Prolonged cold exposure (more than four weeks) increased the amplitude and kinetics of D[Ca 2þ ] i by increasing intracellular Ca 2þ cycling through the sarcoplasmic reticulum (SR). These functional findings are supported by electron microscopy, which revealed a greater volume fraction of ventricular SR in cold-acclimated tuna myocytes. The results indicate that SR function is crucial to the performance of the bluefin tuna heart in the cold. We suggest that SR Ca 2þ cycling is the malleable unit of cellular Ca 2þ flux, offering a mechanism for thermal plasticity in fish hearts. These findings have implications beyond endothermic fish and may help to delineate the key steps required to protect vertebrate cardiac function in the cold.

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In situcardiac performance of Pacific bluefin tuna hearts in response to acute temperature change

Cited by 122 publications

References 63 publications

Quantifying energy intake in Pacific bluefin tuna (Thunnus orientalis) using the heat increment of feeding

Quantifying energy intake in Pacific bluefin tuna (Thunnus orientalis) using the heat increment of feeding

Acclimation potential of Arctic cod (Boreogadus saida Lepechin) from the rapidly warming Arctic Ocean

Warm fish with cold hearts: thermal plasticity of excitation–contraction coupling in bluefin tuna

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