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

Berggren, Martin LU ; Ström, Lena LU ; Laudon, Hjalmar; Karlsson, Jan; Jonsson, Anders; Giesler, Reiner; Bergstrom, Ann-Kristin and Jansson, Mats (2010) In Ecology Letters 13(7). p.870-880
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
low molecular weight organic, Allochthony, lake secondary production, carbon
in
Ecology Letters
volume
13
issue
7
pages
870 - 880
publisher
Wiley-Blackwell
external identifiers
  • wos:000278798100010
  • scopus:77954701952
ISSN
1461-023X
DOI
10.1111/j.1461-0248.2010.01483.x
language
English
LU publication?
yes
id
c3ef5bb3-1a85-49df-a0ca-ec744e8609f4 (old id 1630481)
date added to LUP
2010-07-21 15:39:20
date last changed
2018-07-08 03:16:27
@article{c3ef5bb3-1a85-49df-a0ca-ec744e8609f4,
  abstract     = {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.},
  author       = {Berggren, Martin and Ström, Lena and Laudon, Hjalmar and Karlsson, Jan and Jonsson, Anders and Giesler, Reiner and Bergstrom, Ann-Kristin and Jansson, Mats},
  issn         = {1461-023X},
  keyword      = {low molecular weight organic,Allochthony,lake secondary production,carbon},
  language     = {eng},
  number       = {7},
  pages        = {870--880},
  publisher    = {Wiley-Blackwell},
  series       = {Ecology Letters},
  title        = {Lake secondary production fueled by rapid transfer of low molecular weight organic carbon from terrestrial sources to aquatic consumers},
  url          = {http://dx.doi.org/10.1111/j.1461-0248.2010.01483.x},
  volume       = {13},
  year         = {2010},
}