Acclimation to cyclic hypoxia improves thermal tolerance and copper survival in the caridean shrimp Palaemon varians

Peruzza, Luca; Thatje, Sven; Hauton, Chris

doi:10.1016/j.cbpa.2021.111010

Cited by 6 publications

(5 citation statements)

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“…Data on the acclimation effects of mild or intermittent hypoxia that allow higher tolerance to more severe hypoxic treatments have indicated that at least some such hormesis effects exist (Borowiec & Scott, 2020;Hermes-Lima et al, 2015;Peruzza et al, 2021;Yang et al, 2013). However, details of transcriptional and biochemical…”

Section: Introductionmentioning

confidence: 99%

“…Some of these studies report data consistent with rapid appearance of local adaptation to geographically variable hypoxia likelihood (Brennan et al, 2018; Pédron et al, 2017; Regan et al, 2017; Schulte, 2014). Data on the acclimation effects of mild or intermittent hypoxia that allow higher tolerance to more severe hypoxic treatments have indicated that at least some such hormesis effects exist (Borowiec & Scott, 2020; Hermes‐Lima et al, 2015; Peruzza et al, 2021; Yang et al, 2013). However, details of transcriptional and biochemical plasticity behind these acclimation effects are not well understood.…”

Section: Introductionmentioning

confidence: 99%

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The interplay between prior selection, mild intermittent exposure, and acute severe exposure in phenotypic and transcriptional response to hypoxia

Ekwudo

Malek

Anderson

et al. 2022

Ecology and Evolution

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Hypoxia has profound and diverse effects on aerobic organisms, disrupting oxidative phosphorylation and activating several protective pathways. Predictions have been made that exposure to mild intermittent hypoxia may be protective against more severe exposure and may extend lifespan. Here we report the lifespan effects of chronic, mild, intermittent hypoxia, and short‐term survival in acute severe hypoxia in four clones of Daphnia magna originating from either permanent or intermittent habitats. We test the hypothesis that acclimation to chronic mild intermittent hypoxia can extend lifespan through activation of antioxidant and stress‐tolerance pathways and increase survival in acute severe hypoxia through activation of oxygen transport and storage proteins and adjustment to carbohydrate metabolism. Unexpectedly, we show that chronic hypoxia extended the lifespan in the two clones originating from intermittent habitats but had the opposite effect in the two clones from permanent habitats, which also showed lower tolerance to acute hypoxia. Exposure to chronic hypoxia did not protect against acute hypoxia; to the contrary, Daphnia from the chronic hypoxia treatment had lower acute hypoxia tolerance than normoxic controls. Few transcripts changed their abundance in response to the chronic hypoxia treatment in any of the clones. After 12 h of acute hypoxia treatment, the transcriptional response was more pronounced, with numerous protein‐coding genes with functionality in oxygen transport, mitochondrial and respiratory metabolism, and gluconeogenesis, showing upregulation. While clones from intermittent habitats showed somewhat stronger differential expression in response to acute hypoxia than those from permanent habitats, contrary to predictions, there were no significant hypoxia‐by‐habitat of origin or chronic‐by‐acute treatment interactions. GO enrichment analysis revealed a possible hypoxia tolerance role by accelerating the molting cycle and regulating neuron survival through upregulation of cuticular proteins and neurotrophins, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The interplay between prior selection, mild intermittent exposure, and acute severe exposure in phenotypic and transcriptional response to hypoxia

Ekwudo

Malek

Anderson

et al. 2022

Ecology and Evolution

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“…The ‘oxygen and capacity limitation of thermal tolerance’ hypothesis (OCLTT) predicts lower thermal tolerances under anoxic conditions in most aquatic ectotherms, due to the fact that the aerobic metabolic demand cannot be met under the absence of oxygen ( Pörtner, 2001 ; McBryan et al, 2013 ; Jung et al, 2020 ; Earhart et al, 2022 ; Pörtner et al, 2017 ; Jutfelt et al, 2018 ). However there are several examples that show acclimation to hypoxia increases thermal tolerance in fishes ( Burleson and Silva, 2011 ; Del Rio et al, 2021 ; Peruzza et al, 2021 ; Ern et al, 2023 ) and we therefore hypothesize that hypoxia might not affect thermal tolerances of our study species since they are acclimated and even evolutionarily adapted to severe hypoxia.…”

Section: Introductionmentioning

confidence: 89%

Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia

Pacher,

Hernández-Román,

Juarez-Lopez

et al. 2024

Biology Open

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The thermal ecology of ectotherm animals has gained considerable attention in the face of human-induced climate change. Particularly in aquatic species, the experimental assessment of critical thermal limits (CTmin and CTmax) may help to predict possible effects of global warming on habitat suitability and ultimately species survival. Here we present data on the thermal limits of two endemic and endangered extremophile fish species, inhabiting a geothermally heated and sulfur-rich spring system in southern Mexico: The sulfur molly (Poecilia sulphuraria) and the widemouth gambusia (Gambusia eurystoma). Besides physiological challenges induced by toxic hydrogen sulfide and related severe hypoxia during the day, water temperatures have been previously reported to exceed those of nearby clearwater streams. We now present temperature data for various locations and years in the sulfur spring complex and conducted laboratory thermal tolerance tests (CTmin and CTmax) both under normoxic and severe hypoxic conditions in both species. Average CTmax limits did not differ between species when dissolved oxygen was present. However, critical temperature (CTmax=43.2°C) in P. sulphuraria did not change when tested under hypoxic conditions, while G. eurystoma on average had a lower CTmax when oxygen was absent. Based on this data we calculated both species' thermal safety margins and used a TDT (thermal death time) model framework to relate our experimental data to observed temperatures in the natural habitat. Our findings suggest that both species live near their thermal limits during the annual dry season and are locally already exposed to temperatures above their critical thermal limits. We discuss these findings in the light of possible physiological adaptions of the sulfur-adapted fish species and the anthropogenic threats for this unique system.

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“…Based on the 'oxygen and capacity limitation of thermal tolerance' hypothesis (OCLTT) we predicted lower thermal tolerances under anoxic conditions in our study species due to the fact that the aerobic metabolic demand cannot be met when under hypoxic conditions thus leading to a decrease in thermal tolerance (Pörtner 2001, McBryan et al 2013, Jung et al 2020, Earhart et al 2022 (Pörtner et al 2017, Jutfelt et al 2018. Alternatively, there are several examples that show acclimation to hypoxia increases thermal tolerance in fishes (Burleson and Silva 2011a, Del Rio et al 2021, Peruzza et al 2021, Ern et al 2023) and we could thus also predict that hypoxia might not affect thermal tolerances of our study species that are acclimated and even evolutionary adapted to severe hypoxia. Here, O 2 -independent anaerobic metabolism might be predominant which leaves these species unaffected in there thermal tolerances when tested under hypoxia.…”

Section: Introductionmentioning

confidence: 91%

Increased thermal tolerance under anoxic conditions in an extremophile fish from hot sulfur springs in Mexico

Pacher,

Hernández-Román,

Juarez-Lopez

et al. 2023

Preprint

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The thermal ecology of ectotherm animals has gained considerable attention in the face of human induced climate change. Particularly in aquatic species the experimental assessment of critical thermal limits (CTmin and CTmax) may help to predict possible effects of global warming on habitat suitability and ultimately species survival. Here we present data on the thermal limits of two endemic and endangered extremophile fish species, inhabiting a geothermally heated and sulfur-rich spring system in Southern Mexico: The sulfur molly (Poecilia sulphuraria) and the widemouth gambusia (Gambusia eurystoma). Besides physiological challenges induced by toxic hydrogen sulfide and related severe hypoxia during the day, water temperatures have been previously reported to exceed those of nearby clearwater streams. We now present temperature data for various locations and years in the sulphur spring complex and conducted laboratory thermal tolerance tests (CTmin and CTmax) both under normoxic as well as sever hypoxic conditions in both species. Average CTmax limits did not differ between species under normoxic conditions. Surprisingly P. sulphuraria was found to reach a higher critical temperature (CTmax = 43.2 C) when tested under hypoxic conditions, while G. eurystoma on average had a lower CTmax when oxygen was absent. Based on this data we calculated both species thermal safety margins and used a TDT (thermal death time) model framework to relate our experimental data to observed temperatures in the natural habitat. Our findings suggest, that both species live near their thermal limits during the annual dry season and are locally already exposed to temperatures above their critical thermal limits. We discuss these findings in the light of possible physiological adaptions of the sulfur-adapted fish species and the anthropogenic threats for this unique system.

show abstract

Acclimation to cyclic hypoxia improves thermal tolerance and copper survival in the caridean shrimp Palaemon varians

Cited by 6 publications

References 50 publications

The interplay between prior selection, mild intermittent exposure, and acute severe exposure in phenotypic and transcriptional response to hypoxia

The interplay between prior selection, mild intermittent exposure, and acute severe exposure in phenotypic and transcriptional response to hypoxia

Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia

Increased thermal tolerance under anoxic conditions in an extremophile fish from hot sulfur springs in Mexico

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