Ocean acidification compromises energy management in Sparus aurata (Pisces: Teleostei)

The effects of ocean acidification mediated by an increase in water pCO(2) levels on marine organisms are currently under debate. Elevated CO2 concentrations in the seawater induce several physiological responses in teleost fish, including acid-base imbalances and osmoregulatory changes. However, th...

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Bibliographic Details
Published in:Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology
Main Authors: Ruiz-Jarabo, I., Gregorio, SF, Alves, Alexandra, Mancera, J. M., Fuentes, Juan
Format: Article in Journal/Newspaper
Language:English
Published: ELSEVIER SCIENCE INC 2021
Subjects:
Energy management
Fish
Intermediary metabolism
Ocean acidification
Sparus aurata
Biochemistry & Molecular Biology
Physiology
Zoology
Online Access:http://hdl.handle.net/10400.1/16956
https://doi.org/10.1016/j.cbpa.2021.110911
Description
Summary:The effects of ocean acidification mediated by an increase in water pCO(2) levels on marine organisms are currently under debate. Elevated CO2 concentrations in the seawater induce several physiological responses in teleost fish, including acid-base imbalances and osmoregulatory changes. However, the consequences of CO2 levels enhancement on energy metabolism are mostly unknown. Here we show that 5 weeks of exposure to hypercapnia (950 and 1800 mu atm CO2) altered intermediary metabolism of gilthead seabream (Sparus aurata) compared to fish acclimated to current ocean values (440 mu atm CO2). We found that seabream compromises its physiological acid-base balance with increasing water CO2 levels and the subsequent acidification. Intestinal regions (anterior, mid, and rectum) engaged in maintaining this balance are thus altered, as seen for Na+/K+ ATPase and the vacuolar-type H+-ATPase activities. Moreover, liver and muscle counteracted these effects by increasing catabolic routes e.g., glycogenolysis, glycolysis, amino acid turnover, and lipid catabolism, and plasma energy metabolites were altered. Our results demonstrate how a relatively short period of 5 weeks of water hypercapnia is likely to disrupt the acid-base balance, osmoregulatory capacity and intermediary metabolism in S. aurata. However, long-term studies are necessary to fully understand the consequences of ocean acidification on growth and other energy-demanding activities, such as reproduction. Ministry of Science and Higher EducationMinistry of Science and Higher Education, PolandEuropean Commission; European Social Funds through the Portuguese National Science Foundation (FCT)Portuguese Foundation for Science and Technology [PTDC/MAR-BIO/3034/2014]; Portuguese Foundation for Science and Technology (FCT)Portuguese Foundation for Science and Technology [UIDB/04326/2020]

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