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Acclimation and acute temperature effects on population differences in oxidative phosphorylation.

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Area of Science:

  • Physiology
  • Environmental Science
  • Biochemistry

Background:

  • Temperature significantly impacts organismal metabolism across various timescales.
  • Understanding thermal effects on cardiac metabolism is crucial for predicting species' responses to climate change.

Purpose of the Study:

  • To investigate the effects of acute temperature and acclimation on cardiac oxidative phosphorylation (OxPhos) in three Fundulus taxa.
  • To identify evolved differences in OxPhos among Fundulus populations and their thermal plasticity.

Main Methods:

  • Quantified six cardiac OxPhos traits (state 3, E state, complex I, II, IV activities, LEAK ratio) in Fundulus species.
  • Fish were acclimated to 12°C and 28°C and then acutely exposed to 12°C, 20°C, and 28°C.

Main Results:

  • Acute temperature affected all measured OxPhos traits.
  • Acclimation significantly influenced state 3 respiration and the LEAK ratio.
  • Significant interactions were observed between acclimation, population, and acute temperature for various OxPhos traits, particularly state 3 and complex I.

Conclusions:

  • Acclimation alters the acute temperature response of cardiac OxPhos, with effects varying based on acclimation and assay temperatures.
  • Population-specific differences in OxPhos become more apparent at the extremes of the thermal range, suggesting evolved adaptations.
  • These findings highlight the complex interplay between temperature, acclimation, and evolved physiological traits in fish metabolism.