Acclimation to warmer temperature reversibly improves high-temperature hypoxia tolerance in both diploid and triploid brook charr, Salvelinus fontinalis

Jensen, Rebecca R; Benfey, Tillmann J.

doi:10.1016/j.cbpa.2021.111099

Cited by 6 publications

(1 citation statement)

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“…In fish exposed to heatwave conditions, hypoxia tolerance at 20 °C was not different from that of pre-heatwave fish tested at 13 °C, indicating complete compensation of this trait 48 . In comparison, most fish species demonstrate little or no compensation of hypoxia tolerance with warming, and if they www.nature.com/scientificreports/ do, compensation is generally only partial and only occurs across a relatively small range of temperatures 49,50 . Juvenile sturgeon thus exhibit a much greater degree of cross-tolerance than has been demonstrated for most fish species.…”

Section: Discussionmentioning

confidence: 99%

Heatwave resilience of juvenile white sturgeon is associated with epigenetic and transcriptional alterations

Earhart,

Blanchard,

Strowbridge

et al. 2023

Sci Rep

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Heatwaves are increasing in frequency and severity, posing a significant threat to organisms globally. In aquatic environments heatwaves are often associated with low environmental oxygen, which is a deadly combination for fish. However, surprisingly little is known about the capacity of fishes to withstand these interacting stressors. This issue is particularly critical for species of extreme conservation concern such as sturgeon. We assessed the tolerance of juvenile white sturgeon from an endangered population to heatwave exposure and investigated how this exposure affects tolerance to additional acute stressors. We measured whole-animal thermal and hypoxic performance and underlying epigenetic and transcriptional mechanisms. Sturgeon exposed to a simulated heatwave had increased thermal tolerance and exhibited complete compensation for the effects of acute hypoxia. These changes were associated with an increase in mRNA levels involved in thermal and hypoxic stress (hsp90a, hsp90b, hsp70 and hif1a) following these stressors. Global DNA methylation was sensitive to heatwave exposure and rapidly responded to acute thermal and hypoxia stress over the course of an hour. These data demonstrate that juvenile white sturgeon exhibit substantial resilience to heatwaves, associated with improved cross-tolerance to additional acute stressors and involving rapid responses in both epigenetic and transcriptional mechanisms.

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Section: Discussionmentioning

confidence: 99%