Effects of rising temperature on pelagic biogeochemistry in mesocosm systems: a comparative analysis of the AQUASHIFT Kiel experiments
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A comparative analysis of data, obtained during four indoor-mesocosm experiments with natural spring plankton communities from the Baltic Sea, was conducted to investigate whether biogeochemical cycling is affected by an increase in water temperature of up to 6 °C above present-day conditions. In all experiments, warming stimulated in particular heterotrophic bacterial processes and had an accelerating effect on the temporal development of phytoplankton blooms. This was also mirrored in the build-up and partitioning of organic matter between particulate and dissolved phases. Thus, warming increased both the magnitude and rate of dissolved organic carbon (DOC) build-up, whereas the accumulation of particulate organic carbon (POC) and phosphorus (POP) decreased with rising temperature. In concert, the observed temperature-mediated changes in biogeochemical components suggest strong shifts in the functioning of marine pelagic food webs and the ocean’s biological carbon pump, hence providing potential feedback mechanisms to Earth’s climate system.
KeywordsParticulate Organic Matter Particulate Organic Carbon Experimental Warming Dissolve Organic Phosphorus Bloom Period
We would like to thank A. Ludwig, N. Händel and P. Fritsche for their technical assistance in sample preparation and analysis. All members of the Kiel AQUASHIFT-team are appreciated for their help during the experiments. We are particularly grateful to E. Zöllner and the anonymous reviewers for their comments on an earlier version of this manuscript. This work was supported by Deutsche Forschungsgemeinschaft (DFG) grant no. RI 598/2-3 to U. R. and A. E. and by the Helmholtz Association (contract no. HZ-NG-102 to A. E.).
- Breithaupt P (2009) The impact of climate change on phytoplankton-bacterioplankton interactions. Dissertation, Christian-Albrechts-University, Kiel, GermanyGoogle Scholar
- Gargas E (1975) A manual for phytoplankton primary production studies in the Baltic. Baltic Mar Biol 2:1–88Google Scholar
- Kroeker KJ, Kordas RL, Crim RN, Singh GG (2010) Meta-analysis reveals negative yet variable effects of ocean acidification on marine organisms. Ecol Lett. doi: 10.1111/j.1461-0248.2010.01518x
- Lewandowska AM, Breithaupt P, Hillebrand H, Hoppe HG, Jürgens K, Sommer U (2011) Responses of primary productivity to increased temperature and phytoplankton diversity. J Sea Res. doi: 10.1016/j.seares.2011.10.003
- Meehl GA, Stocker TF, Collins WD, Friedlingstein P, Gaye AT, Gregory JM, Kitoh A, Knutti R, Murphy JM, Noda A, Raper SCB, Watterson IG, Weaver AJ, Zhao ZC (2007) Global climate projections. In: Solomon S, Qin MMD, Chen Z, Marquis M, Averyt KB, Tignor M, Miller HL (eds) Climate change 2007: the physical science basis. Contribution of working group I to the fourth assessment report of the intergovernmental panel on climate change. Cambridge University Press, Cambridge, pp 747–845Google Scholar
- Redfield AC, Ketchum BM, Richards FA (1963) The influence of organism on the composition of sea-water. In: Hill MN (ed) The sea. Wiley, New York, pp 26–77Google Scholar
- Sarmiento JL, Slater R, Barber R, Bopp L, Doney SC, Hirst AC, Kleypas J, Matear R, Mikolajewicz U, Monfray P, Soldatov V, Spall SA, Stouffer R (2004) Response of ocean ecosystems to climate warming. Glob Biogeochem Cycles 18:GB3003Google Scholar
- Steemann Nielsen E (1952) The use of radioactive carbon (14C) for measuring production in the sea. J Cons Int Explor Mer 18:117–140Google Scholar
- Wohlers J (2009) The impact of climate change on phytoplankton-bacterioplankton interactions. Dissertation, Christian-Albrechts-University, Kiel, GermanyGoogle Scholar