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Changes in Arctic marine bacterial carbon metabolism in response to increasing temperature

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Abstract

Arctic areas of deep-water convection have a large potential for export of organic carbon from surface waters into the deep sea and, therefore, are an important part of the global carbon cycle. As the Arctic is reportedly heating up faster than any other part of the planet, temperature-driven changes in the biogeochemical cycling in these areas can be very significant. Here, we study the regulation of bacterial carbon metabolism, which process vast amounts of organic carbon, by temperature and the availability of resources. The response of bacterial production and respiration of natural bacterial assemblages from the Fram Strait was studied by experimental manipulations of temperature and resources in combination. Both bacterial production and respiration were enhanced by temperature so that the total bacterial carbon demand increased sixfold following a temperature increase of 6°C. Respiration responded more strongly than production so that bacterial growth efficiency decreased with increasing temperature. Although neither production nor respiration was limited by resource availability under in situ conditions, the response to temperature was higher in resource-amended treatments, indicative of a substrate-temperature interaction regulating both components of bacterial metabolism. In conclusion, the results show that warming can result in a substantial increase of the carbon flow through bacteria and that most of the carbon consumed would be released as CO2. Moreover, the results suggest that both temperature and availability of resources need to be considered to accurately be able to predict changes in bacterial carbon metabolism in response to climate change.

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Acknowledgments

This research is a contribution to the Arctic Tipping Points project (www.eu-atp.org) funded by FP7 of the European Union (contract #226248), iAOOS, a Complementary Action from the Spanish Ministry of Science and Education (reference CGL2007-28773-E/ANT) and the ARCTOS network. Financial support was provided by the Norwegian Research Council through its International Polar Year programme and the project iAOOS NorwayClosing the Loop (grant # 176096/S30; http://www.iaoos.no). We thank the crew and captain of the University of Tromsø research vessel Jan Mayen for support, and Raquel Vaquer Sunyer, Tobias Tamelander, Sigrid Øygarden, Alexey Pavlov and Marit Reigstad for assistance. We are indebted to the Arctic sea fog that came just in time to study a 97% eclipse of the sun with our bare eyes.

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Correspondence to Emma S. Kritzberg.

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Kritzberg, E.S., Duarte, C.M. & Wassmann, P. Changes in Arctic marine bacterial carbon metabolism in response to increasing temperature. Polar Biol 33, 1673–1682 (2010). https://doi.org/10.1007/s00300-010-0799-7

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  • DOI: https://doi.org/10.1007/s00300-010-0799-7

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