Future ocean warming may prove beneficial for the northern population of European seabass, but ocean acidification will not

Type Article
Date 2019-11
Language English
Author(s) Howald Sarah1, 2, Cominassi Louise2, Le Bayon Nicolas3, Claireaux Guy3, 4, Mark Felix C.1
Affiliation(s) 1 : Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Integrative Ecophysiology, 27570 Bremerhaven, Germany
2 : Institute of Marine Ecosystem and Fisheries Science, Center for Earth System Research and Sustainability (CEN), University of Hamburg, 22767 Hamburg, Germany
3 : Ifremer, LEMAR (UMR 6539), Laboratory of Adaptation, and Nutrition of Fish, Centre Ifremer de Bretagne, 29280 Plouzané, France
4 : Université de Bretagne Occidentale, LEMAR (UMR 6539), 29280 Plouzané, France
Source Journal Of Experimental Biology (0022-0949) (The Company of Biologists), 2019-11 , Vol. 222 , N. 21 , P. (?)
DOI 10.1242/jeb.213017
WOS© Times Cited 5
Keyword(s) Mitochondrial respiration, Developmental acclimation, Temperate teleost, Heart

The world's oceans are acidifying and warming as a result of increasing atmospheric CO2 concentrations. The thermal tolerance of fish greatly depends on the cardiovascular ability to supply the tissues with oxygen. The highly oxygen-dependent heart mitochondria thus might play a key role in shaping an organism's tolerance to temperature. The present study aimed to investigate the effects of acute and chronic warming on the respiratory capacity of European sea bass (Dicentrarchus labrax L.) heart mitochondria. We hypothesized that acute warming would impair mitochondrial respiratory capacity, but be compensated for by life-time conditioning. Increasing PCO2 may additionally cause shifts in metabolic pathways by inhibiting several enzymes of the cellular energy metabolism. Among other shifts in metabolic pathways, acute warming of heart mitochondria of cold life-conditioned fish increased leak respiration rate, suggesting a lower aerobic capacity to synthesize ATP with acute warming. However, thermal conditioning increased mitochondrial functionality, e.g. higher respiratory control ratios in heart mitochondria of warm life-conditioned compared with cold life-conditioned fish. Exposure to high PCO2 synergistically amplified the effects of acute and long-term warming, but did not result in changes by itself. This high ability to maintain mitochondrial function under ocean acidification can be explained by the fact that seabass are generally able to acclimate to a variety of environmental conditions. Improved mitochondrial energy metabolism after warm conditioning could be due to the origin of this species in the warm waters of the Mediterranean. Our results also indicate that seabass are not yet fully adapted to the colder temperatures in their northern distribution range and might benefit from warmer temperatures in these latitudes.

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Howald Sarah, Cominassi Louise, Le Bayon Nicolas, Claireaux Guy, Mark Felix C. (2019). Future ocean warming may prove beneficial for the northern population of European seabass, but ocean acidification will not. Journal Of Experimental Biology, 222(21), (?). Publisher's official version : https://doi.org/10.1242/jeb.213017 , Open Access version : https://archimer.ifremer.fr/doc/00592/70446/