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Maury Olivier, Poggiale J. C., Aumont Olivier. (2019). Damage-related protein turnover explains inter-specific patterns of maintenance rate and suggests modifications of the DEB theory. Journal of Sea Research, 143 (Special Issue), 35-47. ISSN 1385-1101

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Titre
Damage-related protein turnover explains inter-specific patterns of maintenance rate and suggests modifications of the DEB theory
Année de publication2019
Type de documentArticle référencé dans le Web of Science WOS:000453497600005
AuteursMaury Olivier, Poggiale J. C., Aumont Olivier.
SourceJournal of Sea Research, 2019, 143 (Special Issue), p. 35-47. ISSN 1385-1101
RésuméMaintenance is the energy that living organisms are bound to use to maintain their structure in a viable state. It includes all the metabolic and physiological costs that are not directly associated to the production of biomass (growth and reproduction) or to development (maturation). In the framework of the DEB theory, the somatic maintenance rate can either be proportional to organism structural volume V or, more marginally, to structural surface V-2/3. Being mostly associated to similar metabolic processes, volume-specific maintenance costs are not expected to vary substantially at both intra- and inter-specific levels. In the DEB theory, the volume-specific maintenance rate [P-M] is therefore supposed to keep constant from birth to death and to remain approximately constant between species. However, a recent meta-analysis of DEB parameters estimated using the Add-my-Pet collection (Kooijman, 2014) reveals troubling patterns apparently violating this inter-specific scaling rule and challenging the DEB theory. It is indeed shown in this study that empirically-derived volume-specific maintenance rates scale approximately with L-m(-0,4) and display a very high variability around this trend. Overall, estimated maintenance rates in Add-my-Pet span over three to four orders of magnitude, thus invalidating the assumption of constant maintenance rate between species, which underpins the covariation rules for parameter values of the DEB theory. In an attempt to address this major problem for the DEB theory, we propose a simple physiological mechanism that would simultaneously explain the apparent decrease of volume-specific maintenance rate with ultimate size and its apparent variability for a given range of maximum size. Our proposition consists in making protein (and more generally structure) turnover explicit in maintenance and linking protein damage rate to aerobic metabolism and the production of ROS, which are decreasing with both structural volume and maximum structural volume. We show that this implies that the actual volume specific maintenance rate varies both at the intra- and inter-specific levels in a range very similar to what is observed in the Add-my-Pet data estimations. If true, this implies that the apparent decrease of volume-specific maintenance rate with ultimate size is an artefact and it requires modifications of the standard DEB theory in order to capture empirical inter-specific scaling patterns of DEB-parameters while keeping the consistency of the theory at both intra- and inter-specific levels.
Plan de classementSciences fondamentales / Techniques d'analyse et de recherche [020] ; Ecologie, systèmes aquatiques [036]
LocalisationFonds IRD [F B010074827]
Identifiant IRDfdi:010074827
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010074827

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