Contrasting patterns of energy metabolism in northern vs southern peripheral European flounder populations exposed to temperature rising and hypoxia

• Published in: Marine Environmental Research
• Main Authors: Pédron, Nicolas, Le Du, Jessy, Charrier, Grégory, Zambonino-Infante, Jose-Luis, Le Bayon, Nicolas, Vasconcelos, Rita P., Fonseca, Vanessa F., Le Grand, Fabienne, Laroche, Jean
• Other Authors: Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Brest (UBO), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Marine and Environmental Sciences Centre Portugal (MARE), Instituto Universitário de Ciências Psicológicas, Sociais e da Vida (ISPA), ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2017
• Subjects: ACL; Platichthys flesus; global change; climate-change; gene-expression; Bioenergetics; adaptive divergence; chemical stress; Interacting stressors; intraspecific variation; juvenile turbot; platichthys-flesus l; Thermal tolerance; yellow perch; envir; socio; Turbot
• Online Access: https://doi.org/10.1016/j.marenvres.2017.06.010; https://hal.archives-ouvertes.fr/hal-02613078

WOS:000407981500023 A two months common garden experiment was carried out to explore the potential differences of energy metabolism in northern core (France, 50 degrees N and 47 degrees N)vs southern peripheral (Portugal, 41 degrees N) populations of European flounder Platichthys flesus, submitted to cold condition (CC: water temperature = 10 degrees C) and to warm and hypoxic condition (WHC: water temperature = 22 degrees C, and moderate hypoxia with O-2 saturation = 40% during the last 6 days). Convergent growth rates (in length) were observed in the different populations and conditions, when the southern peripheral population of Portugal did not grow under cold conditions. A general reduction in liver lipid storage was observed in all populations subjected to WHC when compared to CC, whereas muscle lipid storage was unaffected. The thermal and hypoxia treatment induced changes in muscle phospholipids (PL) ratios: phosphatidylserine/PL, phosphatidylinositol/PL, between northern and southern populations. Fish from northern estuaries displayed marked anaerobiosis in WHC (increased liver LDH activity) vs marked aerobiosis under CC (higher muscle CS and CCO activities). Contrariwise, fish from the southern estuary displayed equilibrium between anaerobiosis and aerobiosis activities in WHC. Flounders from the southern population exhibited generally lower G6PDH activity (proxy for anabolism and for defense against oxidative damage), tissue-specific anaerobiosis response (muscle LDH activity) and lower CS and CCO muscle activities (aerobiosis markers) when compared to northern populations. Globally, these inter-population differences in bioenergetics suggest that southern peripheral vs northern core populations have developed differential capacity to cope with interacting stressors and that much of this variation is more likely due to local adaptation.