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Carbon and phosphorus regulating bacterial metabolism in oligotrophic boreal lakes

Vidal, Luciana O.; Granéli, Wilhelm LU ; Daniel, Cesar Bolivar LU ; Heiberg, Lisa and Roland, Fabio (2011) In Journal of Plankton Research 33(11). p.1747-1756
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
DOC, phosphorus, bacterial growth efficiency, bacterial respiration, bacterial production
in
Journal of Plankton Research
volume
33
issue
11
pages
1747 - 1756
publisher
Oxford University Press
external identifiers
  • wos:000295507500010
  • scopus:80053527575
ISSN
0142-7873
DOI
10.1093/plankt/fbr059
project
BECC
language
English
LU publication?
yes
id
d5c482b1-b90e-4653-bc79-084af7274a24 (old id 2179369)
date added to LUP
2011-10-24 16:28:23
date last changed
2017-07-30 04:21:14
@article{d5c482b1-b90e-4653-bc79-084af7274a24,
  abstract     = {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.},
  author       = {Vidal, Luciana O. and Granéli, Wilhelm and Daniel, Cesar Bolivar and Heiberg, Lisa and Roland, Fabio},
  issn         = {0142-7873},
  keyword      = {DOC,phosphorus,bacterial growth efficiency,bacterial respiration,bacterial production},
  language     = {eng},
  number       = {11},
  pages        = {1747--1756},
  publisher    = {Oxford University Press},
  series       = {Journal of Plankton Research},
  title        = {Carbon and phosphorus regulating bacterial metabolism in oligotrophic boreal lakes},
  url          = {http://dx.doi.org/10.1093/plankt/fbr059},
  volume       = {33},
  year         = {2011},
}