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Lake secondary production fueled by rapid transfer of low molecular weight organic carbon from terrestrial sources to aquatic consumers

Author:
  • Martin Berggren
  • Lena Ström
  • Hjalmar Laudon
  • Jan Karlsson
  • Anders Jonsson
  • Reiner Giesler
  • Ann-Kristin Bergstrom
  • Mats Jansson
Publishing year: 2010
Language: English
Pages: 870-880
Publication/Series: Ecology Letters
Volume: 13
Issue: 7
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

P>Carbon of terrestrial origin often makes up a significant share of consumer biomass in unproductive lake ecosystems. However, the mechanisms for terrestrial support of lake secondary production are largely unclear. By using a modelling approach, we show that terrestrial export of dissolved labile low molecular weight carbon (LMWC) compounds supported 80% (34-95%), 54% (19-90%) and 23% (7-45%) of the secondary production by bacteria, protozoa and metazoa, respectively, in a 7-km2 boreal lake (conservative to liberal estimates in brackets). Bacterial growth on LMWC was of similar magnitude as that of primary production (PP), and grazing on bacteria effectively channelled the LMWC carbon to higher trophic levels. We suggest that rapid turnover of forest LMWC pools enables continuous export of fresh photosynthates and other labile metabolites to aquatic systems, and that substantial transfer of LMWC from terrestrial sources to lake consumers can occur within a few days. Sequestration of LMWC of terrestrial origin, thus, helps explain high shares of terrestrial carbon in lake organisms and implies that lake food webs can be closely dependent on recent terrestrial PP.

Keywords

  • Physical Geography
  • low molecular weight organic
  • Allochthony
  • lake secondary production
  • carbon

Other

Published
  • ISSN: 1461-023X
E-mail: lena [dot] strom [at] nateko [dot] lu [dot] se

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Dept of Physical Geography and Ecosystem Science

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Department of Physical Geography and Ecosystem Science
Lund University
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