TEMPERATURE | Measures of Thermal Tolerance

Beitinger, Thomas L.; Lutterschmidt, William I.

doi:10.1016/b978-0-12-374553-8.00200-8

Cited by 58 publications

(49 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This lifestyle exposes sturgeon to many environmental conditions, including changes in salinity, turbidity, flow/current speed, and temperature (Beamesderfer and Farr, 1997). Temperature is considered one of the most important factors influencing the survival, distribution, ecology, behaviour and physiology of fishes (Fry, 1947;Brett, 1956;Beitinger et al, 2000;Beitinger and Lutterschmidt, 2011). Dredging, damming and effluent runoff from refineries and factories (Rajaguru, 2002) have greatly influenced temperature profiles in aquatic environments (Beamesderfer and Farr, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…metabolism) in various sturgeon species (Secor and Gunderson, 1998;Mayfield and Cech, 2004;Patterson et al, 2013;Kieffer et al, 2014), less is generally known about the thermal tolerance of this group of animals (summarized in Zhang and Kieffer, 2014). Quantifying a species' upper thermal tolerance has become increasingly important for the understanding of this critical aspect of fish ecology (Murchie et al, 2011) as well as the potential impacts of climate change (Beitinger and Lutterschmidt, 2011). Thermal tolerance in animals can be studied using various approaches; of these, the critical thermal maximum test (CTmax) is the most relevant (Beitinger et al, 2000) and is often used to provide an ecologically and physiologically valuable reference point that can signal an early sign of thermal stress (Stewart and Allen, 2014).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Critical thermal maxima and hematology for juvenile Atlantic (Acipenser oxyrinchusMitchill 1815) and shortnose (Acipenser brevirostrumLesueur, 1818) sturgeons

Spear

Kieffer

2016

J. Appl. Ichthyol.

View full text Add to dashboard Cite

Summary The critical thermal maximum (CTmax) and the associated hematological response of juvenile (~145 g, n = 8 for both species) Atlantic Acipenser oxyrinchus and shortnose Acipenser brevirostrum sturgeons acclimated to 15°C were determined using a heating rate of 8°C h−1. The critical thermal maximum averaged 30.8°C and 31.6°C for Atlantic and shortnose sturgeon, respectively, and values fell within the range noted for other sturgeon species. Oxygen‐carrying capacity (hemoglobin and hematocrit) measures were generally unaffected by thermal stress. Plasma lactate levels increased from 0.5 mm to 4 mm following temperature stress in both species. Both plasma glucose and potassium levels increased following CTmax, however, these levels were about double in the shortnose sturgeon. Lastly, plasma sodium and chloride levels were significantly depressed (by more than 10%) following thermal stress in shortnose sturgeon, whereas only chloride levels decreased in Atlantic sturgeon. Taken together, while CTmax values were similar, thermal stress resulted in different hematological profiles; these differences are consistent when compared to other stressors, and may be related to the phylogenetic position and thus could reflect the evolutionary history of these two species.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical thermal maxima and hematology for juvenile Atlantic (Acipenser oxyrinchusMitchill 1815) and shortnose (Acipenser brevirostrumLesueur, 1818) sturgeons

Spear

Kieffer

2016

J. Appl. Ichthyol.

View full text Add to dashboard Cite

show abstract

“…With predicted increases in average global temperatures, as well as an increased frequency of transient extreme heat waves (Diffenbaugh and Field, 2013), fish populations will likely be more exposed to temperatures outside of their thermal tolerance range in the future. Temperature tolerance has been suggested to be an important determinant of species geographical distribution (Sunday et al, 2012), yet the physiological mechanisms determining the upper critical thermal maximum (CT max ) are still not well understood (Beitinger and Lutterschmidt, 2011;Clark et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Thermal sensitivity and phenotypic plasticity of cardiac mitochondrial metabolism in European perch, Perca fluviatilis

Ekström

Sandblom

Blier

et al. 2016

Journal of Experimental Biology

View full text Add to dashboard Cite

Cellular and mitochondrial metabolic capacity of the heart has been suggested to limit performance of fish at warm temperatures. We investigated this hypothesis by studying the effects of acute temperature increases (16, 23, 30, 32.5 and 36°C) on the thermal sensitivity of 10 key enzymes governing cardiac oxidative and glycolytic metabolism in two populations of European perch (Perca fluviatilis) field-acclimated to 15.5 and 22.5°C, as well as the effects of acclimation on cardiac lipid composition. In both populations of perch, the activity of glycolytic ( pyruvate kinase and lactate dehydrogenase) and tricarboxylic acid cycle ( pyruvate dehydrogenase and citrate synthase) enzymes increased with acute warming. However, at temperatures exceeding 30°C, a drastic thermally induced decline in citrate synthase activity was observed in the cold-and warmacclimated populations, respectively, indicating a bottleneck for producing the reducing equivalents required for oxidative phosphorylation. Yet, the increase in aspartate aminotransferase and malate dehydrogenase activities occurring in both populations at temperatures exceeding 30°C suggests that the malate-aspartate shuttle may help to maintain cardiac oxidative capacities at high temperatures. Warm acclimation resulted in a reorganization of the lipid profile, a general depression of enzymatic activity and an increased fatty acid metabolism and oxidative capacity. Although these compensatory mechanisms may help to maintain cardiac energy production at high temperatures, the activity of the electron transport system enzymes, such as complexes I and IV, declined at 36°C in both populations, indicating a thermal limit of oxidative phosphorylation capacity in the heart of European perch.

show abstract

“…The experiment was repeated, except a mesh barrier was placed at the air-water interface to prevent emersion (n ¼ 11-18 per group). Acute thermal tolerance was defined as the temperature at which fish lost equilibrium, which provides a proxy for the physiological upper temperature limit [15]. All fish recovered fully.…”

Section: Methods (A) Emersion Plasticitymentioning

confidence: 99%

Out of the frying pan into the air—emersion behaviour and evaporative heat loss in an amphibious mangrove fish ( Kryptolebias marmoratus )

et al. 2015

View full text Add to dashboard Cite

Amphibious fishes often emerse (leave water) when faced with unfavourable water conditions. How amphibious fishes cope with the risks of rising water temperatures may depend, in part, on the plasticity of behavioural mechanisms such as emersion thresholds. We hypothesized that the emersion threshold is reversibly plastic and thus dependent on recent acclimation history rather than on conditions during early development. Kryptolebias marmoratus were reared for 1 year at 25 or 308C and acclimated as adults (one week) to either 25 or 308C before exposure to an acute increase in water temperature. The emersion threshold temperature and acute thermal tolerance were significantly increased in adult fish acclimated to 308C, but rearing temperature had no significant effect. Using a thermal imaging camera, we also showed that emersed fish in a low humidity aerial environment (308C) lost significantly more heat (3.38C min 21) than those in a high humidity environment (1.68C min 21). In the field, mean relative humidity was 84%. These results provide evidence of behavioural avoidance of high temperatures and the first quantification of evaporative cooling in an amphibious fish. Furthermore, the avoidance response was reversibly plastic, flexibility that may be important for tropical amphibious fishes under increasing pressures from climatic change.

show abstract

TEMPERATURE | Measures of Thermal Tolerance

Cited by 58 publications

References 13 publications

Critical thermal maxima and hematology for juvenile Atlantic (Acipenser oxyrinchusMitchill 1815) and shortnose (Acipenser brevirostrumLesueur, 1818) sturgeons

Critical thermal maxima and hematology for juvenile Atlantic (Acipenser oxyrinchusMitchill 1815) and shortnose (Acipenser brevirostrumLesueur, 1818) sturgeons

Thermal sensitivity and phenotypic plasticity of cardiac mitochondrial metabolism in European perch, Perca fluviatilis

Out of the frying pan into the air—emersion behaviour and evaporative heat loss in an amphibious mangrove fish ( Kryptolebias marmoratus )

Contact Info

Product

Resources

About