FN Archimer Export Format
PT J
TI Energy metabolism of juvenile scallops Nodipecten subnodosus under acute increased temperature and low oxygen availability
BT 
AF Salgado-García, Rosa L.
   Kraffe, Edouard
   Tripp-Valdez, Miguel A.
   Ramírez-Arce, Jose L.
   Artigaud, Sebastien
   FLYE SAINTE MARIE, Jonathan
   Mathieu-Resuge, Margaux
   Sicard, M. Teresa
   Arellano-Martínez, Marcial
   Racotta, Ilie S.
AS 1:1,2;2:3;3:2;4:2;5:3;6:3;7:3;8:2;9:1;10:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Centro Interdisciplinario de Ciencias Marinas (CICIMAR), Instituto Politécnico Nacional (IPN), La Paz, B.C.S, Mexico
   Centro de Investigaciones Biológicas del Noroeste, S. C. (CIBNOR), La Paz, B.C.S, Mexico
   University of Brest, CNRS, IRD, Ifremer, LEMAR, F-29280, Plouzane, France
C2 CICIMAR, MEXICO
   CIBNOR, MEXICO
   UBO, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   copubli-int-hors-europe
   copubli-sud
IF 2.3
TC 2
UR https://archimer.ifremer.fr/doc/00819/93109/99972.pdf
LA English
DT Article
DE ;Bivalve;Growth;Hypoxia;Tolerance;Warming
AB 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 O2 L−1 or PO2 156.9 mmHg), acute hyperthermia under normoxia (treatment T: 30 °C, ∼6.0 mg O2 L−1 or PO2 150.9 mmHg) or acute hyperthermia plus hypoxia (treatment TH: 30 °C, ∼2.5 mg O2 L−1 or PO2 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. 
PY 2023
PD APR
SO Comparative Biochemistry And Physiology A-molecular & Integrative Physiology
SN 1095-6433
PU Elsevier BV
VL 278
UT 000995007800001
DI 10.1016/j.cbpa.2023.111373
ID 93109
ER

EF