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

Kritzberg, Emma LU ; Granéli, Wilhelm LU ; Bjork, Jessica; Brönmark, Christer LU ; Hallgren, Per LU ; Nicolle, Alice LU ; Persson, Anders LU and Hansson, Lars-Anders LU (2014) In Freshwater Biology 59(2). p.325-336
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
brownification, carbon metabolism, climate change, sedimentation, temperature
in
Freshwater Biology
volume
59
issue
2
pages
325 - 336
publisher
Wiley-Blackwell
external identifiers
  • wos:000329370800010
  • scopus:84891631944
ISSN
0046-5070
DOI
10.1111/fwb.12267
project
BECC
MICCS - Molecular Interactions Controlling soil Carbon Sequestration
language
English
LU publication?
yes
id
fe73b012-4a11-4ff2-921c-6e10cdc85c6e (old id 4326985)
date added to LUP
2014-02-24 15:46:08
date last changed
2017-11-19 03:49:35
@article{fe73b012-4a11-4ff2-921c-6e10cdc85c6e,
  abstract     = {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.},
  author       = {Kritzberg, Emma and Granéli, Wilhelm and Bjork, Jessica and Brönmark, Christer and Hallgren, Per and Nicolle, Alice and Persson, Anders and Hansson, Lars-Anders},
  issn         = {0046-5070},
  keyword      = {brownification,carbon metabolism,climate change,sedimentation,temperature},
  language     = {eng},
  number       = {2},
  pages        = {325--336},
  publisher    = {Wiley-Blackwell},
  series       = {Freshwater Biology},
  title        = {Warming and browning of lakes: consequences for pelagic carbon metabolism and sediment delivery},
  url          = {http://dx.doi.org/10.1111/fwb.12267},
  volume       = {59},
  year         = {2014},
}