Warm Acclimation Increases Mitochondrial Efficiency in Fish: A Compensatory Mechanism to Reduce the Demand for Oxygen

Voituron, Yann; Roussel, Damien; Teulier, Loïc; Vagner, Marie; Ternon, Q; Romestaing, Caroline; Dubillot, Emmanuel; Lefrançois, C.

doi:10.1086/716904

Cited by 6 publications

(1 citation statement)

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“…Because metabolic rate ultimately reflects the rate of ATP turnover, changes in the P:O ratio would alter the relationship between Ṁ O 2 and metabolic rate. The P:O ratio depends upon the substrate used for mitochondrial metabolism ( Hinkle, 2005 ) and it varies according to physiological state and ecological conditions ( Koch et al, 2021 ; Le Roy et al, 2021 ; Thoral et al, 2021 ; Voituron et al, 2022 ). In the strictest sense, therefore, metabolic rates (including MMR), are most directly measured as the rate of heat production, i.e.…”

Section: Introductionmentioning

confidence: 99%

Estimating maximum oxygen uptake of fishes during swimming and following exhaustive chase – different results, biological bases and applications

Rees,

Reemeyer,

Binning

et al. 2024

Journal of Experimental Biology

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The maximum rate at which animals take up oxygen from their environment (ṀO2,max) is a crucial aspect of their physiology and ecology. In fishes, ṀO2,max is commonly quantified by measuring oxygen uptake either during incremental swimming tests or during recovery from an exhaustive chase. In this Commentary, we compile recent studies that apply both techniques to the same fish and show that the two methods typically yield different mean estimates of ṀO2,max for a group of individuals. Furthermore, within a group of fish, estimates of ṀO2,max determined during swimming are poorly correlated with estimates determined during recovery from chasing (i.e. an individual's ṀO2,max is not repeatable across methods). One explanation for the lack of agreement is that these methods measure different physiological states, each with their own behavioural, anatomical and biochemical determinants. We propose that these methods are not directly interchangeable but, rather, each is suited to address different questions in fish biology. We suggest that researchers select the method that reflects the biological contexts of their study, and we advocate for the use of accurate terminology that acknowledges the technique used to elevate ṀO2 (e.g. peak ṀO2,swim or peak ṀO2,recovery). If the study's objective is to estimate the ‘true’ ṀO2,max of an individual or species, we recommend that pilot studies compare methods, preferably using repeated-measures designs. We hope that these recommendations contribute new insights into the causes and consequences of variation in ṀO2,max within and among fish species.

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