Ocean acidification ameliorates harmful effects of warming in primary consumer

• Published in: Ecology and Evolution
• Main Authors: Pedersen, Sindre Andre, Hanssen, Anja Elise
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley Open Access 2018
• Subjects: Calanus finmarchicus; Ocean acidification; Subarctic
• Online Access: http://hdl.handle.net/11250/2478376; https://doi.org/10.1002/ece3.3526

Climate change-induced warming and ocean acidification are considered two imminent threats to marine biodiversity and current ecosystem structures. Here, we have for the first time examined an animal's response to a complete life cycle of exposure to co-occurring warming (+3°C) and ocean acidification (+1,600 μatm CO2), using the key subarctic planktonic copepod, Calanus finmarchicus, as a model species. The animals were generally negatively affected by warming, which significantly reduced the females’ energy status and reproductive parameters (respectively, 95% and 69%–87% vs. control). Unexpectedly, simultaneous acidification partially offset the negative effect of warming in an antagonistic manner, significantly improving reproductive parameters and hatching success (233%–340% improvement vs. single warming exposure). The results provide proof of concept that ocean acidification may partially offset negative effects caused by warming in some species. Possible explanations and ecological implications for the observed antagonistic effect are discussed. publishedVersion This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2017 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.