Energy metabolism of juvenile scallops Nodipecten subnodosus under acute increased temperature and low oxygen availability - Université de Bretagne Occidentale Access content directly
Journal Articles Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology Year : 2023

Energy metabolism of juvenile scallops Nodipecten subnodosus under acute increased temperature and low oxygen availability

Abstract

High temperature increases energy demand in ectotherms, limiting their physiological capability to cope with hypoxic events. The present study aimed to assess the metabolic tolerance of juvenile Nodipecten subnodosus scallops to acute hyperthermia combined with moderate hypoxia. A previous study showed that juveniles exhibited a high upper temperature limit (32 • C), but the responses of juveniles to combined hyperthermia and low dissolved oxygen are unknown. Scallops were exposed to control conditions (treatment C: 22 • C, ~7.1 mg O 2 L − 1 or PO 2 156.9 mmHg), acute hyperthermia under normoxia (treatment T: 30 • C, ~6.0 mg O 2 L − 1 or PO 2 150.9 mmHg) or acute hyperthermia plus hypoxia (treatment TH: 30 • C, ~2.5 mg O 2 L − 1 or PO 2 62.5 mmHg) for 18 h. In T, juveniles exhibited an enhanced oxygen consumption, together with a decrease in adenylate energy charge (AEC) and arginine phosphate (ArgP), and with no changes in metabolic enzyme activity in the muscle. In TH, scallops maintained similar AEC and ArgP levels in muscle as those observed in T treatment. This response occurred along with the accumulation of inosine monophosphate and hypoxanthine. Besides, reduced citrate synthase and pyruvate kinase activities, enhanced hexokinase activity, and a higher octopine dehydrogenase/ lactate dehydrogenase ratio in the mantle indicated the onset of anaerobiosis in TH. These responses indicate that juvenile scallops showed tissue-specific compensatory responses regarding their energy balance under moderate hypoxia at high temperatures. Our results give an insight into the tolerance limit of this species to combined hyperthermia and hypoxia in its northern limit of distribution.
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Dates and versions

hal-04132384 , version 1 (19-06-2023)

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Rosa L Salgado-García, Edouard Kraffe, Miguel A Tripp-Valdez, Jose L Ramírez-Arce, Sebastien Artigaud, et al.. Energy metabolism of juvenile scallops Nodipecten subnodosus under acute increased temperature and low oxygen availability. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 2023, 278, ⟨10.1016/j.cbpa.2023.111373⟩. ⟨hal-04132384⟩
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