Oxygen-dependence of upper thermal limits in fishes

Ern, Rasmus; Norin, Tommy; Gamperl, A. Kurt; Esbaugh, Andrew J.

doi:10.1242/jeb.143495

Cited by 123 publications

(157 citation statements)

References 40 publications

(49 reference statements)

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“…These results suggest the possibility of associations among these traits in O. mykiss , but comparisons among only three strains are insufficient to provide firm conclusions on the relationships of these traits and CT max and this potential association should be assessed further by examining individual‐level correlations in the future. Furthermore, although the potential for limitation of aerobic scope to play a role in determining CT max has been demonstrated in some species (Chen et al., ), it is not the case in all species (Wang et al., ; Ern et al., , ).…”

Section: Discussionmentioning

confidence: 99%

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A rainbow trout Oncorhynchus mykiss strain with higher aerobic scope in normoxia also has superior tolerance of hypoxia

Zhang

Healy

Vandersteen³

et al. 2018

Journal of Fish Biology

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This study compared parr from three strains of rainbow trout Oncorhynchus mykiss to examine intraspecific variation in metabolic traits, hypoxia tolerance and upper thermal tolerance in this species. At the strain level, variation in absolute aerobic scope (AAS), critical oxygen level (O ), incipient lethal oxygen saturation (ILOS) and critical thermal maximum (CT ) generally exhibited consistent differences among the strains, suggesting the possibility of functional associations among these traits. This possibility was further supported at the individual level by a positive correlation between ILOS and O and a negative correlation between O and AAS. These results indicate that intraspecific differences in hypoxia tolerance among strains of O. mykiss may be primarily determined by differences in the ability to maintain oxygen uptake in hypoxia and that variation in aerobic scope in normoxia probably plays a role in determining the ability of these fish to sustain metabolism aerobically as water oxygen saturation is reduced.

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Section: Discussionmentioning

confidence: 99%

“…Furthermore, although the potential for limitation of aerobic scope to play a role in determining CT max has been demonstrated 500 Y. Z H A N G E T A L. in some species (Chen et al, 2015), it is not the case in all species (Wang et al, 2014;Ern et al, 2016Ern et al, , 2017.…”

Section: E V I D E N C E F O R a S S O C I At I O N S A M O N G M E Tmentioning

confidence: 99%

A rainbow trout Oncorhynchus mykiss strain with higher aerobic scope in normoxia also has superior tolerance of hypoxia

Zhang

Healy

Vandersteen³

et al. 2018

Journal of Fish Biology

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“…Temperatures employed during these measurements were also noted as respiratory responses when subject to hypoxia are temperature dependent (e.g. Ern, Norin, Gamperl, & Esbaugh, 2016).…”

Section: Published Data On Oxygen Consumption Ratesmentioning

confidence: 99%

Thermal limits in native and alien freshwater peracarid Crustacea: The role of habitat use and oxygen limitation

et al. 2018

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In order to predict which species can successfully cope with global warming and how other environmental stressors modulate their vulnerability to climate‐related environmental factors, an understanding of the ecophysiology underpinning thermal limits is essential for both conservation biology and invasion biology.Heat tolerance and the extent to which heat tolerance differed with oxygen availability were examined for four native and four alien freshwater peracarid crustacean species, with differences in habitat use across species. Three hypotheses were tested: (1) Heat and lack of oxygen synergistically reduce survival of species; (2) patterns in heat tolerance and the modulation thereof by oxygen differ between alien and native species and between species with different habitat use; (3) small animals can better tolerate heat than large animals, and this difference is more pronounced under hypoxia.To assess heat tolerances under different oxygen levels, animal survival was monitored in experimental chambers in which the water temperature was ramped up (0.25°C min−1). Heat tolerance (CTmax) was scored as the cessation of all pleopod movement, and heating trials were performed under hypoxia (5 kPa oxygen), normoxia (20 kPa) and hyperoxia (60 kPa).Heat tolerance differed across species as did the extent by which heat tolerance was affected by oxygen conditions. Heat‐tolerant species, for example, Asellus aquaticus and Crangonyx pseudogracilis, showed little response to oxygen conditions in their CTmax, whereas the CTmax of heat‐sensitive species, for example, Dikerogammarus villosus and Gammarus fossarum, was more plastic, being increased by hyperoxia and reduced by hypoxia.In contrast to other studies on crustaceans, alien species were not more heat‐tolerant than native species. Instead, differences in heat tolerance were best explained by habitat use, with species from standing waters being heat tolerant and species from running waters being heat sensitive. In addition, larger animals displayed lower critical maximum temperature, but only under hypoxia. An analysis of data available in the literature on metabolic responses of the study species to temperature and oxygen conditions suggests that oxygen conformers and species whose oxygen demand rapidly increases with temperature (low activation energy) may be more heat sensitive.The alien species D. villosus appeared most susceptible to hypoxia and heat stress. This may explain why this species is very successful in colonizing new areas in littoral zones with rocky substrate which are well aerated due to continuous wave action generated by passing ships or prevailing winds. This species is less capable of spreading to other waters which are poorly oxygenated and where C. pseudogracilis is the more likely dominant alien species. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.13050/suppinfo is available for this article.

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“…This is supported experimental work in humans, which demonstrates that arterial PO 2 decreases linearly with inspired PO 2 under maximum exercise ( 21 ). The maximum metabolic rates measured under hypoxia for several fish species( 22–25 ) and for the subterranean mole rat( 26 ) are all much lower than measurements made at or above P crit-max and are within 10-20% of the values predicted as α*PO 2 (Fig. 2B; Table S1).…”

Section: Mainmentioning

confidence: 60%

Oxygen supply capacity in animals evolves to meet maximum demand at the current oxygen partial pressure regardless of size or temperature

Seibel

Deutsch

2019

Preprint

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AbstractPhysiological oxygen supply capacity is associated with athletic performance and cardiovascular health and is thought to cause hypometabolic scaling in diverse species. Environmental oxygen is widely believed to be limiting of metabolic rate and aerobic scope, setting thermal tolerance and body size limits with implications for species diversity and biogeography. Here we derive a quantifiable linkage between maximum and basal metabolic rate and their temperature, size and oxygen dependencies. We show that, regardless of size or temperature, the capacity for oxygen supply precisely matches the maximum evolved demand at the highest persistently available oxygen pressure which, for most species assessed, is the current atmospheric pressure. Any reduction in oxygen partial pressure from current values will result in a decrement in maximum metabolic performance. However, oxygen supply capacity does not constrain thermal tolerance and does not cause hypometabolic scaling. The critical oxygen pressure, typically viewed as an indicator of hypoxia tolerance, instead reflects adaptations for aerobic scope. This simple new relationship redefines many important physiological concepts and alters their ecological interpretation.One sentence summary: Metabolism is not oxygen limited

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Oxygen-dependence of upper thermal limits in fishes

Cited by 123 publications

References 40 publications

A rainbow trout Oncorhynchus mykiss strain with higher aerobic scope in normoxia also has superior tolerance of hypoxia

A rainbow trout Oncorhynchus mykiss strain with higher aerobic scope in normoxia also has superior tolerance of hypoxia

Thermal limits in native and alien freshwater peracarid Crustacea: The role of habitat use and oxygen limitation

Oxygen supply capacity in animals evolves to meet maximum demand at the current oxygen partial pressure regardless of size or temperature

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