Food availability modulates the combined effects of ocean acidification and warming on fish growth

Type Article
Date 2020-02
Language English
Author(s) Cominassi Louise1, Moyano Marta1, Claireaux Guy2, Howald Sarah1, 3, Mark Felix C.1, 3, Zambonino-Infante Jose-LuisORCID4
Affiliation(s) 1 : Institute of Marine Ecosystem and Fisheries Science, Center for Earth System Research and Sustainability (CEN), University of Hamburg, 22767, Hamburg, Germany
2 : Université de Bretagne Occidentale, LEMAR (UMR 6539), Centre Ifremer de Bretagne, 29280, Plouzané, France
3 : Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Integrative Ecophysiology, 27570, Bremerhaven, Germany
4 : Ifremer, LEMAR (UMR 6539), Laboratory of Adaptation, Reproduction and Nutrition of Fish, Centre Ifremer de Bretagne, 29280, Plouzané, France
Source Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2020-02 , Vol. 10 , N. 1 , P. 2338 (12p.)
DOI 10.1038/s41598-020-58846-2
WOS© Times Cited 3
Abstract

When organisms are unable to feed ad libitum they may be more susceptible to negative effects of environmental stressors such as ocean acidification and warming (OAW). We reared sea bass (Dicentrarchus labrax) at 15 or 20 °C and at ambient or high PCO2 (650 versus 1750 µatm PCO2; pH = 8.1 or 7.6) at ad libitum feeding and observed no discernible effect of PCO2 on the size-at-age of juveniles after 277 (20 °C) and 367 (15 °C) days. Feeding trials were then conducted including a restricted ration (25% ad libitum). At 15 °C, growth rate increased with ration but was unaffected by PCO2. At 20 °C, acidification and warming acted antagonistically and low feeding level enhanced PCO2 effects. Differences in growth were not merely a consequence of lower food intake but also linked to changes in digestive efficiency. The specific activity of digestive enzymes (amylase, trypsin, phosphatase alkaline and aminopeptidase N) at 20 °C was lower at the higher PCO2 level. Our study highlights the importance of incorporating restricted feeding into experimental designs examining OAW and suggests that ad libitum feeding used in the majority of the studies to date may not have been suitable to detect impacts of ecological significance.

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