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Lake secondary production fueled by rapid transfer of low molecular weight organic carbon from terrestrial sources to aquatic consumers
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap. (Arcum)
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2010 (Engelska)Ingår i: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 13, nr 7, s. 870-880Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Ecology Letters (2010) Abstract 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-km(2) 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.

Ort, förlag, år, upplaga, sidor
2010. Vol. 13, nr 7, s. 870-880
Nyckelord [en]
Allochthony, lake secondary production, low molecular weight organic carbon
Identifikatorer
URN: urn:nbn:se:umu:diva-34753DOI: 10.1111/j.1461-0248.2010.01483.xISI: 000278798100010PubMedID: 20482576OAI: oai:DiVA.org:umu-34753DiVA, id: diva2:324693
Tillgänglig från: 2010-06-16 Skapad: 2010-06-16 Senast uppdaterad: 2018-06-08Bibliografiskt granskad

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Berggren, MartinKarlsson, JanJonsson, AndersGiesler, ReinerBergström, Ann-KristinJansson, Mats

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