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Heterotrophic bacterial and viral dynamics in Arctic freshwaters: results from a field study and nutrient-temperature manipulation experiments

Sawstrom, C.; Laybourn-Parry, J.; Granéli, Wilhelm LU and Anesio, A. M. (2007) In Polar Biology 30(11). p.1407-1415
Abstract
Heterotrophic bacterial and viral concentrations (range, 0.7 x 10(4) to 206.2 x 10(4) ml(-1) and 0.05 x 10(6) to 128.9 x 10(6) ml(-1), respectively) were determined in several Arctic freshwater environments, including lakes and glacial ecosystems (78.55 degrees N, 11.56 degrees E). Our bacteria and virus results mirrored trends seen in temperate lakes, with an average virus-to-bacteria ratio (VBR) of 13 (range, 7.3-25.2) and viral concentrations and DOC positively correlated with bacterial concentrations (R = 0.964, P < 0.01 and R = 0.813, P < 0.05, respectively). Lysogenic bacteria, determined by induction with Mitomycin C, were not detected in any of the investigated Arctic freshwater environments. Nutrient-addition experiments at... (More)
Heterotrophic bacterial and viral concentrations (range, 0.7 x 10(4) to 206.2 x 10(4) ml(-1) and 0.05 x 10(6) to 128.9 x 10(6) ml(-1), respectively) were determined in several Arctic freshwater environments, including lakes and glacial ecosystems (78.55 degrees N, 11.56 degrees E). Our bacteria and virus results mirrored trends seen in temperate lakes, with an average virus-to-bacteria ratio (VBR) of 13 (range, 7.3-25.2) and viral concentrations and DOC positively correlated with bacterial concentrations (R = 0.964, P < 0.01 and R = 0.813, P < 0.05, respectively). Lysogenic bacteria, determined by induction with Mitomycin C, were not detected in any of the investigated Arctic freshwater environments. Nutrient-addition experiments at in situ and at elevated temperatures were performed to elucidate the factors which influenced the bacterial growth and the virus-bacteria interactions in Arctic freshwaters. Our results suggest that multiple limiting factors interacted and constrained bacterial growth. Bacterial concentrations and doubling times increased at elevated temperatures and appeared to be co-stimulated by phosphorus and carbon. However, viral concentrations showed a lack of response to nutrient addition thus indicating an uncoupling between bacteria and viruses in the experiment. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
viruses, bacteria, temperature, Arctic, nutrients
in
Polar Biology
volume
30
issue
11
pages
1407 - 1415
publisher
Springer
external identifiers
  • wos:000249306800005
  • scopus:34548527602
ISSN
1432-2056
DOI
10.1007/s00300-007-0301-3
language
English
LU publication?
yes
id
2cac68b0-75a3-4d2e-89eb-9e65768db022 (old id 656981)
date added to LUP
2007-12-14 14:14:21
date last changed
2017-04-02 03:25:30
@article{2cac68b0-75a3-4d2e-89eb-9e65768db022,
  abstract     = {Heterotrophic bacterial and viral concentrations (range, 0.7 x 10(4) to 206.2 x 10(4) ml(-1) and 0.05 x 10(6) to 128.9 x 10(6) ml(-1), respectively) were determined in several Arctic freshwater environments, including lakes and glacial ecosystems (78.55 degrees N, 11.56 degrees E). Our bacteria and virus results mirrored trends seen in temperate lakes, with an average virus-to-bacteria ratio (VBR) of 13 (range, 7.3-25.2) and viral concentrations and DOC positively correlated with bacterial concentrations (R = 0.964, P &lt; 0.01 and R = 0.813, P &lt; 0.05, respectively). Lysogenic bacteria, determined by induction with Mitomycin C, were not detected in any of the investigated Arctic freshwater environments. Nutrient-addition experiments at in situ and at elevated temperatures were performed to elucidate the factors which influenced the bacterial growth and the virus-bacteria interactions in Arctic freshwaters. Our results suggest that multiple limiting factors interacted and constrained bacterial growth. Bacterial concentrations and doubling times increased at elevated temperatures and appeared to be co-stimulated by phosphorus and carbon. However, viral concentrations showed a lack of response to nutrient addition thus indicating an uncoupling between bacteria and viruses in the experiment.},
  author       = {Sawstrom, C. and Laybourn-Parry, J. and Granéli, Wilhelm and Anesio, A. M.},
  issn         = {1432-2056},
  keyword      = {viruses,bacteria,temperature,Arctic,nutrients},
  language     = {eng},
  number       = {11},
  pages        = {1407--1415},
  publisher    = {Springer},
  series       = {Polar Biology},
  title        = {Heterotrophic bacterial and viral dynamics in Arctic freshwaters: results from a field study and nutrient-temperature manipulation experiments},
  url          = {http://dx.doi.org/10.1007/s00300-007-0301-3},
  volume       = {30},
  year         = {2007},
}