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Increased temperature, rather than elevated CO2, modulates the carbon assimilation of the Arctic kelps Saccharina latissima and Laminaria solidungula

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Abstract

Ocean acidification and warming are affecting with special intensity the Arctic Ocean. Arctic coastal ecosystems are dominated by kelp forests with a high biomass production, which are expected to be directly affected by the increases in CO2 and temperature. This study presents the different physiological responses of the Arctic kelps Saccharina latissima and Laminaria solidungula from Kongsfjorden (Svalbard) cultured at 4 and 9 °C in combination with current (390 ppm) and increased (1200 ppm) levels of atmospheric CO2. Both species were largely unaffected by increased CO2 conditions. Carbon fixation was not influenced by CO2, indicating that photosynthesis was C-saturated at present levels, and 13C isotopic discrimination values from algal tissue suggested no deactivation of carbon concentrating mechanisms at increased CO2 levels. Inhibition of photosynthesis by carbonic anhydrases (CAs) inhibitors highlighted the important role of external CAs in inorganic carbon acquisition in Arctic kelps. Saccharina latissima showed a significantly higher growth rate at 9 °C than at 4 °C, probably due to the decrease in the dark respiration rate observed. Growth rate of L. solidungula was not affected by temperature or CO2, and increases in photosynthesis at 9 °C could be partially related to a higher dissolved organic carbon release rate. The photochemical performance of both species was not altered by any of the treatments. These results suggest that S. latissima might be more benefited than L. solidungula in a future warmer Arctic, while both populations seem to be resilient to higher CO2 concentrations.

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Acknowledgements

This work was performed at the International Arctic Environmental Research and Monitoring Facility at Ny-Ålesund, Spitsbergen, Norway. We thank the AWI diving team for collecting algal samples and Elisabeth Helmke (AWI) for assistance with 14C counting.

Funding

This study was financed by the project CGL2015-67014-R from the Spanish Ministry for Economy and Competitiveness. Concepcion Iñiguez and M. Rosario Lorenzo were supported by a FPU Grant from the Spanish Ministry for Education.

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  1. Department of Ecology, Faculty of Sciences, University of Malaga, Boulevard Louis Pasteur s/n, 29010, Málaga, Spain

    Concepción Iñiguez, Raquel Carmona, M. Rosario Lorenzo, F. Xavier Niell & Francisco J. L. Gordillo

  2. Department of Functional Ecology, Helmholtz Centre for Marine and Polar Research, Alfred-Wegener-Institute, Am Handelshafen 12, 27570, Bremerhaven, Germany

    Christian Wiencke

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  1. Concepción Iñiguez
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Iñiguez, C., Carmona, R., Lorenzo, M.R. et al. Increased temperature, rather than elevated CO2, modulates the carbon assimilation of the Arctic kelps Saccharina latissima and Laminaria solidungula . Mar Biol 163, 248 (2016). https://doi.org/10.1007/s00227-016-3024-6

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