Thermal tolerance traits of the undulated surf clam Paphia undulata based on heart rate and physiological energetics

Aquaculture ◽  
2019 ◽  
Vol 498 ◽  
pp. 343-350 ◽  
Author(s):  
Pengfei Zhang ◽  
Tian Zhao ◽  
Long Zhou ◽  
Guodong Han ◽  
Yawei Shen ◽  
...  
Keyword(s):  
Heart Rate ◽  
Thermal Tolerance ◽  
Surf Clam ◽  
Physiological Energetics

scholarly journals Impact of anthropogenic ocean acidification on thermal tolerance of the spider crab <i>Hyas araneus</i>

2009 ◽  
Vol 6 (2) ◽  
pp. 2837-2861 ◽  
Author(s):  
K. Walther ◽  
F. J. Sartoris ◽  
C. Bock ◽  
H. O. Pörtner
Keyword(s):  
Heart Rate ◽  
Thermal Tolerance ◽  
Thermal Sensitivity ◽  
Co2 Concentration ◽  
Spider Crab ◽  
Thermal Window ◽  
Co2 Levels ◽  
Hyas Araneus ◽  
Q10 Values ◽  
Critical Temperature Tc

Abstract. Future scenarios project combined developments of elevated CO2 concentrations and global warming and their impact on marine ecosystems. The synergistic impact of both factors was addressed by studying the effect of CO2 accumulation on thermal tolerance of the cold-eurythermal spider crab Hyas araneus. Animals were exposed to present day normocapnia (380 ppm CO2), CO2 levels expected towards 2100 (710 ppm) and beyond (3000 ppm). Heart rate and haemolymph PO2 (PeO2) were measured during progressive short term cooling from 10 to 0°C and during warming from 10 to 25°C. An increase of PeO2 occurred during cooling with highest values reached at 0°C under all three CO2 levels. Heart rate increased during warming until a critical temperature (Tc) was reached. The putative Tc under normocapnia was presumably >25°C, from where it fell to 23.5°C under 710 ppm and then 21.1°C under 3000 ppm. At the same time, thermal sensitivity, as seen in the Q10 values of heart rate, rose with increasing CO2 concentration in the warmth. Our results suggest a narrowing of the thermal window of Hyas araneus under moderate increases in CO2 levels by exacerbation of the heat or cold induced oxygen and capacity limitation of thermal tolerance.

Thermal tolerance by embryos and larvae of the surf clam Spisula solidissima

1984 ◽  
Vol 34 (1) ◽  
pp. 162-169 ◽  
Author(s):  
W.H. Roosenburg ◽  
D.A. Wright ◽  
M. Castagna
Keyword(s):  
Thermal Tolerance ◽  
Spisula Solidissima ◽  
Surf Clam

scholarly journals Neural dysfunction at the upper thermal limit in the zebrafish

2020 ◽  
Author(s):  
Anna H. Andreassen ◽  
Petter Hall ◽  
Pouya Khatibzadeh ◽  
Fredrik Jutfelt ◽  
Florence Kermen
Keyword(s):  
Heart Rate ◽  
Heat Stress ◽  
High Temperatures ◽  
Neural Activity ◽  
Thermal Tolerance ◽  
Oxygen Availability ◽  
Adult Zebrafish ◽  
Thermal Limit ◽  
Larval Zebrafish ◽  
Upper Thermal Limit

ABSTRACTUnderstanding animal thermal tolerance is crucial to predict how animals will respond to increasingly warmer temperatures, and to mitigate the impact of the climate change on species survival. Yet, the physiological mechanisms underlying animal thermal tolerance are largely unknown. In this study, we developed a method for measuring upper thermal limit (CTmax) in larval zebrafish (Danio rerio) and found that it occurs at similar temperatures as in adult zebrafish. We discovered that CTmax precedes a transient, heat-induced brain-wide depolarization during heat ramping. By monitoring heart rate, we established that cardiac function is sub-optimal during the period where CTmax and brain depolarization occur. In addition, we found that oxygen availability affects both locomotor neural activity and CTmax during a heat stress. The findings of this study suggest that neural impairment due to limited oxygen availability at high temperatures can cause CTmax in zebrafish.HighlightsLarval zebrafish reach their critical thermal limit (CTmax) at similar temperature as adult zebrafishAcute heat stress causes a brain-wide spreading depolarization near the upper thermal limitCTmax precedes brain-wide depolarizationHeart rate declines at high temperatures but is maintained during CTmax and brain depolarizationNeural activity is impaired prior to CTmax and brain-wide depolarizationOxygen availability in the water affects both CTmax and neural activity

scholarly journals Impact of anthropogenic ocean acidification on thermal tolerance of the spider crab <i>Hyas araneus</i>

2009 ◽  
Vol 6 (10) ◽  
pp. 2207-2215 ◽  
Author(s):  
K. Walther ◽  
F. J. Sartoris ◽  
C. Bock ◽  
H. O. Pörtner
Keyword(s):  
Heart Rate ◽  
Thermal Tolerance ◽  
Thermal Sensitivity ◽  
Co2 Concentration ◽  
Spider Crab ◽  
Ambient Temperatures ◽  
Thermal Window ◽  
Co2 Levels ◽  
Hyas Araneus ◽  
Q10 Values

Abstract. Future scenarios for the oceans project combined developments of CO2 accumulation and global warming and their impact on marine ecosystems. The synergistic impact of both factors was addressed by studying the effect of elevated CO2 concentrations on thermal tolerance of the cold-eurythermal spider crab Hyas araneus from the population around Helgoland. Here ambient temperatures characterize the southernmost distribution limit of this species. Animals were exposed to present day normocapnia (380 ppm CO2), CO2 levels expected towards 2100 (710 ppm) and beyond (3000 ppm). Heart rate and haemolymph PO2 (PeO2) were measured during progressive short term cooling from 10 to 0°C and during warming from 10 to 25°C. An increase of PeO2 occurred during cooling, the highest values being reached at 0°C under all three CO2 levels. Heart rate increased during warming until a critical temperature (Tc) was reached. The putative Tc under normocapnia was presumably >25°C, from where it fell to 23.5°C under 710 ppm and then 21.1°C under 3000 ppm. At the same time, thermal sensitivity, as seen in the Q10 values of heart rate, rose with increasing CO2 concentration in the warmth. Our results suggest a narrowing of the thermal window of Hyas araneus under moderate increases in CO2 levels by exacerbation of the heat or cold induced oxygen and capacity limitation of thermal tolerance.

scholarly journals Influence of the coronary circulation on thermal tolerance and cardiac performance during warming in rainbow trout

2017 ◽  
Vol 312 (4) ◽  
pp. R549-R558 ◽  
Author(s):  
Andreas Ekström ◽  
Michael Axelsson ◽  
Albin Gräns ◽  
Jeroen Brijs ◽  
Erik Sandblom
Keyword(s):  
Heart Rate ◽  
Blood Flow ◽  
Rainbow Trout ◽  
Cardiac Function ◽  
Thermal Tolerance ◽  
Coronary Flow ◽  
Coronary Circulation ◽  
Cardiac Performance ◽  
Juvenile Trout

Thermal tolerance in fish may be related to an oxygen limitation of cardiac function. While the hearts of some fish species receive oxygenated blood via a coronary circulation, the influence of this oxygen supply on thermal tolerance and cardiac performance during warming remain unexplored. Here, we analyzed the effect in vivo of acute warming on coronary blood flow in adult sexually mature rainbow trout ( Onchorhynchus mykiss) and the consequences of chronic coronary ligation on cardiac function and thermal tolerance in juvenile trout. Coronary blood flow at 10°C was higher in females than males (0.56 ± 0.08 vs. 0.30 ± 0.08 ml·min−1·g ventricle−1), and averaged 0.47 ± 0.07 ml·min−1·g ventricle−1 across sexes. Warming increased coronary flow in both sexes until 14°C, at which it peaked and plateaued at 0.78 ± 0.1 and 0.61 ± 0.1 ml·min−1·g ventricle−1 in females and males, respectively. Thus, the scope for increasing coronary flow was 101% in males, but only 39% in females. Coronary-ligated juvenile trout exhibited elevated heart rate across temperatures, reduced Arrhenius breakpoint temperature for heart rate (23.0 vs. 24.6°C), and reduced upper critical thermal maximum (25.3 vs. 26.3°C). To further analyze the effects of coronary flow restriction on cardiac rhythmicity, electrocardiogram characteristics were determined before and after coronary occlusion in anesthetized trout. Occlusion resulted in reduced R-wave amplitude and an elevated S-T segment, indicating myocardial ischemia, while heart rate was unaffected. This suggests that the tachycardia in ligated trout across temperatures in vivo was mainly to compensate for reduced cardiac contractility to maintain cardiac output. Moreover, our findings show that coronary flow increases with warming in a sex-specific manner. This may improve whole animal thermal tolerance, presumably by sustaining cardiac oxygenation and contractility at high temperatures.

scholarly journals Oxygen limitation of thermal tolerance in cod, Gadus morhua L., studied by magnetic resonance imaging and on-line venous oxygen monitoring

2004 ◽  
Vol 287 (4) ◽  
pp. R902-R910 ◽  
Author(s):  
Gisela Lannig ◽  
Christian Bock ◽  
Franz J. Sartoris ◽  
Hans O. Pörtner
Keyword(s):  
Magnetic Resonance Imaging ◽  
Heart Rate ◽  
Blood Flow ◽  
Magnetic Resonance ◽  
Cardiac Arrhythmia ◽  
Thermal Tolerance ◽  
Gadus Morhua ◽  
Venous Blood Flow ◽  
Resonance Imaging ◽  
Temperature Dependent

The hypothesis of an oxygen-limited thermal tolerance due to restrictions in cardiovascular performance at extreme temperatures was tested in Atlantic cod, Gadus morhua (North Sea). Heart rate, changes in arterial and venous blood flow, and venous oxygen tensions were determined during an acute temperature change to define pejus (“getting worse”) temperatures that border the thermal optimum range. An exponential increase in heart rate occurred between 2 and 16°C (Q10 = 2.38 ± 0.35). Thermal sensitivity was reduced beyond 16°C when cardiac arrhythmia became visible. Flow-weighted magnetic resonance imaging (MRI) measurements of temperature-dependent blood flow revealed no exponential but a hyperbolic increase of blood flow with a moderate linear increase at temperatures >4°C. Therefore, temperature-dependent heart rate increments are not mirrored by similar increments in blood flow. Venous Po2 (PvO2), which reflects the quality of oxygen supply to the heart of cod (no coronary circulation present), followed an inverse U-shaped curve with highest PvO2 levels at 5.0 ± 0.2°C. Thermal limitation of circulatory performance in cod set in below 2°C and beyond 7°C, respectively, characterized by decreased PvO2. Further warming led to a sharp drop in PvO2 beyond 16.1 ± 1.2°C in accordance with the onset of cardiac arrhythmia and, likely, the critical temperature. In conclusion, progressive cooling or warming brings cod from a temperature range of optimum cardiac performance into a pejus range, when aerobic scope falls before critical temperatures are reached. These patterns might cause a shift in the geographical distribution of cod with global warming.

scholarly journals Adrenergic tone benefits cardiac performance and warming tolerance in two teleost fishes that lack a coronary circulation

2021 ◽  
Author(s):  
Andreas Ekström ◽  
Erika Sundell ◽  
Daniel Morgenroth ◽  
Erik Sandblom
Keyword(s):  
Heart Rate ◽  
Cardiac Function ◽  
High Temperatures ◽  
Oxygen Delivery ◽  
Thermal Tolerance ◽  
Heart Function ◽  
Perca Fluviatilis ◽  
Cardiac Performance ◽  
Adrenergic Stimulation

AbstractTolerance to acute environmental warming in fish is partly governed by the functional capacity of the heart to increase systemic oxygen delivery at high temperatures. However, cardiac function typically deteriorates at high temperatures, due to declining heart rate and an impaired capacity to maintain or increase cardiac stroke volume, which in turn has been attributed to a deterioration of the electrical conductivity of cardiac tissues and/or an impaired cardiac oxygen supply. While autonomic regulation of the heart may benefit cardiac function during warming by improving myocardial oxygenation, contractility and conductivity, the role of these processes for determining whole animal thermal tolerance is not clear. This is in part because interpretations of previous pharmacological in vivo experiments in salmonids are ambiguous and were confounded by potential compensatory increases in coronary oxygen delivery to the myocardium. Here, we tested the previously advanced hypothesis that cardiac autonomic control benefits heart function and acute warming tolerance in perch (Perca fluviatilis) and roach (Rutilus rutilus); two species that lack coronary arteries and rely entirely on luminal venous oxygen supplies for cardiac oxygenation. Pharmacological blockade of β-adrenergic tone lowered the upper temperature where heart rate started to decline in both species, marking the onset of cardiac failure, and reduced the critical thermal maximum (CTmax) in perch. Cholinergic (muscarinic) blockade had no effect on these thermal tolerance indices. Our findings are consistent with the hypothesis that adrenergic stimulation improves cardiac performance during acute warming, which, at least in perch, increases acute thermal tolerance.

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