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Warming and browning of lakes: consequences for pelagic carbon metabolism and sediment delivery

Author:
  • Emma Kritzberg
  • Wilhelm Granéli
  • Jessica Bjork
  • Christer Brönmark
  • Per Hallgren
  • Alice Nicolle
  • Anders Persson
  • Lars-Anders Hansson
Publishing year: 2014
Language: English
Pages: 325-336
Publication/Series: Freshwater Biology
Volume: 59
Issue: 2
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

1. Thousands of lakes in the Northern Hemisphere are experiencing a continuous increase in water temperature and colour. While increasing temperature is an effect of climate change, several factors are suggested to drive the increasing water colour, including climate change, altered land use and reversed acidification. 2. In this mesocosm study, we study the effects on pelagic production and sedimentation of organic carbon from a 3 degrees C increase in temperature, a doubling of water colour and a combination of increased temperature and water colour. These manipulations correspond to the predicted development in water colour and temperature in northern temperate systems within the life time of the next generation. 3. The water and plankton communities in the mesocosms were taken from an oligohumic and mesotrophic lake, and the increase in water colour was achieved by the additions of water from a humic lake. The experiment ran from early March to late October. 4. In accordance with our predictions and previous cross-system analyses, net carbon production (NCP) and organic carbon sedimentation decreased in response to increasing water colour. 5. At odds with current theory, NCP and sedimentation increased in heated treatments, as not only respiration but also gross production increased in response to temperature. There were no synergistic effects between warming and browning. 6. These results imply that warming may enhance pelagic delivery of organic carbon to sediments. This could potentially offset a reduction in burial efficiency of organic carbon, which has been projected based on a positive relationship between carbon mineralisation in sediments and temperature.

Keywords

  • Ecology
  • brownification
  • carbon metabolism
  • climate change
  • sedimentation
  • temperature

Other

Published
  • BECC
  • MICCS - Molecular Interactions Controlling soil Carbon Sequestration
  • ISSN: 0046-5070
Anders Persson
E-mail: anders [dot] persson [at] biol [dot] lu [dot] se

Senior lecturer

Aquatic ecology

+46 46 222 83 67

E-D113

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