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Carbon and phosphorus regulating bacterial metabolism in oligotrophic boreal lakes

Author:
  • Luciana O. Vidal
  • Wilhelm Granéli
  • Cesar Bolivar Daniel
  • Lisa Heiberg
  • Fabio Roland
Publishing year: 2011
Language: English
Pages: 1747-1756
Publication/Series: Journal of Plankton Research
Volume: 33
Issue: 11
Document type: Journal article
Publisher: Oxford University Press

Abstract english

This study focused on how phosphorus and carbon control pelagic bacteria in lakes over a gradient of dissolved organic carbon (DOC from 6.7 to 29.5 mg C L-1) and phosphorus (P-tot from 5 to 19 mu g L-1). Five oligotrophic lakes in southern Sweden were sampled in late autumn. Phosphate-P and glucose-C alone or in combination (0.01 and 0.3 mg L-1, respectively) was added to 1.0 mu m filtered lake water and incubated in darkness at 20 degrees C. Additions of glucose (C) and phosphorus (P) alone did not lead to changes in the rates of bacterial metabolic processes, whereas bacterial respiration and bacterial production responded positively to C + P enrichment for most of the lakes sampled. Bacterial growth efficiency showed a wide range (2.5-28.7%) and low mean value (12%). These variations were not correlated with the DOC concentration. Our results show that heterotrophic bacterial carbon mineralization in this kind of system during autumn is conditioned by the combined availability of labile carbon and phosphorus, with the assimilated carbon mainly transformed to inorganic carbon in respiration, contributing to CO2 supersaturation in these systems.

Keywords

  • Ecology
  • Environmental Sciences
  • DOC
  • phosphorus
  • bacterial growth efficiency
  • bacterial respiration
  • bacterial production

Other

Published
  • BECC
  • ISSN: 0142-7873
Wilhelm Granéli
E-mail: wilhelm [dot] graneli [at] biol [dot] lu [dot] se

Professor emeritus

Aquatic ecology

+46 70 279 82 34

E-D123

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