Effects of acclimation temperature on the thermal tolerance, hypoxia tolerance and swimming performance of two endangered fish species in China

Zhou, Long-Yan; Fu, Shi‐Jian; Fu, Cheng; Ling, Hong; Li, Xiu-Ming

doi:10.1007/s00360-018-01201-9

Cited by 27 publications

(11 citation statements)

References 49 publications

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“…Temperature was measured, in the half of the tank holding the fish, to the nearest 0.1°C, and was homogeneous throughout this region. During the CT max trial, temperature was increased at 0.3°C min −1 , the standard rate recommended for zebrafish [34,35,38,39] and other freshwater fishes [40][41][42][43].…”

Section: Methodsmentioning

confidence: 99%

Hypoxia inducible factor-1 α knockout does not impair acute thermal tolerance or heat hardening in zebrafish

Joyce

Perry

2020

Biol. Lett.

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The rapid increase in critical thermal maximum (CT max ) in fish (or other animals) previously exposed to critically high temperature is termed ‘heat hardening’, which likely represents a key strategy to cope with increasingly extreme environments. The physiological mechanisms that determine acute thermal tolerance, and the underlying pathways facilitating heat hardening, remain debated. It has been posited, however, that exposure to high temperature is associated with tissue hypoxia and may be associated with the increased expression of hypoxia-inducible factor-1 (Hif-1). We studied acute thermal tolerance in zebrafish ( Danio rerio ) lacking functional Hif-1 α paralogs (Hif-1aa and Hif-1ab double knockout; Hif-1 α −/− ), which are known to exhibit markedly reduced hypoxia tolerance. We hypothesized that Hif-1 α −/− zebrafish would suffer reduced acute thermal tolerance relative to wild type and that the heat hardening ability would be lost. However, on the contrary, we observed that Hif-1 α −/− and wild-type fish did not differ in CT max , and both genotypes exhibited heat hardening of a similar degree when CT max was re-tested 48 h later. Despite exhibiting impaired hypoxia tolerance, Hif-1 α −/− zebrafish display unaltered thermal tolerance, suggesting that these traits are not necessarily functionally associated. Hif-1 α is accordingly not required for short-term acclimation in the form of heat hardening.

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Section: Methodsmentioning

confidence: 99%

Hypoxia inducible factor-1 α knockout does not impair acute thermal tolerance or heat hardening in zebrafish

Joyce

Perry

2020

Biol. Lett.

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“…Either aquarium heaters or chillers were used to adjust treatment temperatures at a rate of 2°C/day until they reached the assigned treatment (Fangue et al ., 2014). After reaching the treatment temperature, fish were acclimated for 14 days before beginning experiments—similar acclimation lengths have been used in other studies of fish thermal biology (McDonnell and Chapman, 2016; Malekar et al ., 2018; Zhou et al ., 2019). Unless otherwise noted, fish were fed a daily ration of commercial flake food and dried bloodworms.…”

Section: Methodsmentioning

confidence: 99%

Temperature effects on performance and physiology of two prairie stream minnows

Frenette

Bruckerhoff

Tobler

et al. 2019

Conservation Physiology

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“…To assess the upper thermal limits of fishes (and other ectotherms), many studies have estimated critical thermal maximum (CT max ), typically quantified as the temperature at which the fish loses equilibrium in response to acute linear temperature increases (Del Rio et al, 2019; McDonnell & Chapman, 2015; Zhou et al, 2019). Specifically, the fish is exposed to increasing water temperature at a standard rapid rate of increase (often 0.3°C per minute) until loss of equilibrium (LOE) (Becker & Genoway, 1979; Lutterschmidt & Hutchison, 1997).…”

Section: Introductionmentioning

confidence: 99%

Take time to look at the fish: Behavioral response to acute thermal challenge in two Amazonian cichlids

Kochhann

Sarmento²,

Oliveira

et al. 2021

J Exp Zool Pt A

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Critical thermal maximum (CTmax) is often used as an index of upper thermal tolerance in fishes; however, recent studies have shown that some fishes exhibit agitation or avoidance behavior well before the CTmax is reached. In this study, we quantified behavioral changes during CTmax trials in two Amazonian cichlids, Apistogramma agassizii and Mesonauta insignis. The thermal agitation temperature (Tag) was recorded as the temperature at which fish left cover and began swimming in an agitated manner, and four behaviors (duration of sheltering, digging, activity, and aquatic surface respiration [ASR]) were compared before and after Tag. Both A. agassizii and M. insignis exhibited high critical thermal maxima, 40.8°C and 41.3°C, respectively. Agitation temperature was higher in M. insignis (37.3°C) than in A. agassizii (35.4°C), indicating that A. agassizii has a lower temperature threshold at which avoidance behavior is initiated. Activity level increased and shelter use decreased with increased temperatures, and patterns were similar between the two species. Digging behavior increased after Tag in both species, but was higher in A. agassazii and may reflect its substrate‐oriented ecology. ASR (ventilating water at the surface film) was extremely rare before Tag, but increased in both cichlid species after Tag and was greater in M. insignis than in A. agassizii. This suggests that fish were experiencing physiological hypoxia at water temperatures approaching CTmax. These results demonstrate that acute thermal challenge can induce a suite of behavioral changes in fishes that may provide additional, ecologically relevant information on thermal tolerance.

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Effects of acclimation temperature on the thermal tolerance, hypoxia tolerance and swimming performance of two endangered fish species in China

Cited by 27 publications

References 49 publications

Hypoxia inducible factor-1 α knockout does not impair acute thermal tolerance or heat hardening in zebrafish

Hypoxia inducible factor-1 α knockout does not impair acute thermal tolerance or heat hardening in zebrafish

Temperature effects on performance and physiology of two prairie stream minnows

Take time to look at the fish: Behavioral response to acute thermal challenge in two Amazonian cichlids

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