Divergent responses of Atlantic cod to ocean acidification and food limitation.

Stiasny, Martina H. , Sswat, Michael , Mittermayer, Felix H. , Falk-Petersen, Inger-Britt, Schnell, Nalani K., Puvanendran, Velmurugu, Mortensen, Atle, Reusch, Thorsten B. H. and Clemmesen, Catriona (2018) Divergent responses of Atlantic cod to ocean acidification and food limitation. Global Change Biology . DOI 10.1111/gcb.14554.

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Abstract

In order to understand the effect of global change on marine fishes, it is imperative to quantify the effects on fundamental parameters such as survival and growth. Larval survival and recruitment of the Atlantic cod (Gadus morhua) were found to be heavily impaired by end-of-century levels of ocean acidification. Here, we analysed larval growth among 35–36 days old surviving larvae, along with organ development and ossification of the skeleton. We combined CO2treatments (ambient: 503 µatm, elevated: 1,179 µatm) with food availability in order to evaluate the effect of energy limitation in addition to the ocean acidification stressor. As expected, larval size (as a proxy for growth) and skeletogenesis were positively affected by high food availability. We found significant interactions between acidification and food availability. Larvae fed ad libitum showed little difference in growth and skeletogenesis due to the CO2 treatment. Larvae under energy limitation were significantly larger and had further developed skeletal structures in the elevated CO2 treatment compared to the ambient CO2 treatment. However, the elevated CO2 group revealed impairments in critically important organs, such as the liver, and had comparatively smaller functional gills indicating a mismatch between size and function. It is therefore likely that individual larvae that had survived acidification treatments will suffer from impairments later during ontogeny. Our study highlights important allocation trade-off between growth and organ development, which is critically important to interpret acidification effects on early life stages of fish.

Document Type: Article
Keywords: early life stages; energy limitation; food regimes; Gadus morhua; gill development; histology; laboratory experiment; lipid content; ossification; RNA/DNA ratios
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1111/gcb.14554
ISSN: 1354-1013
Projects: BIOACID, BONUS BIO-C3
Date Deposited: 04 Feb 2019 10:35
Last Modified: 06 Feb 2019 11:21
URI: http://oceanrep.geomar.de/id/eprint/45660

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