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ID: 281068.0, MPI für Evolutionsbiologie / Ecophysiology
Utilisation of dissolved organic carbon from different sources by pelagic bacteria in an acidic mining lake
Authors:Kamjunke, Norbert; Bohn, Christiane; Grey, Jonathan
Date of Publication (YYYY-MM-DD):2006-03
Title of Journal:Archiv für Hydrobiologie
Journal Abbrev.:Arch. Hydrobiol.
Issue / Number:3
Start Page:355
End Page:364
Review Status:not specified
Audience:Not Specified
Abstract / Description:We compared growth rates and efficiencies of pelagic bacteria from an extremely acidic mining lake (pH 2.6, mean depth 4.6m) supplied with different sources of carbon: (1) excreted by phytoplankton, (2) derived from benthic algae, (3) entering the lake via ground water, and (4) leached from leaf litter. Bacteria exhibited high growth rate and efficiency on exudates of pelagic and benthic algae. In contrast, they showed a lower growth rate and efficiency with organic carbon from ground water, and grew at a very high rate but a very low efficiency on leaf leachate. Results from stable isotope analyses indicate a greater importance of benthic exudates and leaf leachate for bacteria in the epilimnion, and a higher impact of ground water sources in the hypolimnion. Given the magnitude of differential source inputs into the lake, we suggest that benthic primary production was the most important carbon source for pelagic bacteria. The benthic-pelagic coupling seems to be more relevant in this shallow acidic lake with low pelagic carbon dioxide concentrations than in neutral lakes.
Free Keywords:bacteria; DOC; primary production; stable isotopes; acidic mining lake
External Publication Status:published
Document Type:Article
Affiliations:MPI für Limnologie/Abt. Ökophysiologie
External Affiliations:Univ Potsdam, Inst Biochem Biol, Maulbeerallee 2, Potsdam, D-14469 Germany; Univ. Bayreuth, Chair Didactics Biol., Universitätsstr. 30/house NWI, D-95447 Bayreuth, Germany; School Biol. Chem. Sci., Queen Mary Univ. London, Mile End Road, London E1 4NS, UK
Identifiers:ISSN:0003-9136 [ID-No:1]
DOI:10.1127/0003-9136/2006/0165-0355 [ID-No:2]
LOCALID:2441/S 38488 [Listen-Nummer/S-Nummer]
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