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An experimental investigation of phytoplankton nutrient limitation in two contrasting low arctic lakes

Brutemark, A; Rengefors, Karin LU and Anderson, N J (2006) In Polar Biology 29(6). p.487-494
Abstract
We investigated whether phytoplankton communities in two lakes in SW Greenland were phosphorus or nitrogen limited. The study lakes have contrasting water chemistry (mean conductivities differ ten fold) and are located near Kangerlussuaq, SW Greenland (similar to 67 degrees N, 51 degrees W). A microcosm nutrient enrichment experiment was performed in June 2003 to determine whether nitrate or phosphate addition stimulated phytoplankton growth. Samples were analysed for species composition, biomass, and alkaline phosphatase activity (APA). Initially, both lakes had extremely low total phosphorus but high total nitrogen concentrations and high APA, suggesting that the phytoplankton were phosphorus limited prior to the start of the experiment.... (More)
We investigated whether phytoplankton communities in two lakes in SW Greenland were phosphorus or nitrogen limited. The study lakes have contrasting water chemistry (mean conductivities differ ten fold) and are located near Kangerlussuaq, SW Greenland (similar to 67 degrees N, 51 degrees W). A microcosm nutrient enrichment experiment was performed in June 2003 to determine whether nitrate or phosphate addition stimulated phytoplankton growth. Samples were analysed for species composition, biomass, and alkaline phosphatase activity (APA). Initially, both lakes had extremely low total phosphorus but high total nitrogen concentrations and high APA, suggesting that the phytoplankton were phosphorus limited prior to the start of the experiment. The phytoplankton composition and biomass (mainly Ochromonas spp.) responded to phosphate but not to nitrate addition. In both lakes, chlorophyll a increased significantly when phosphate was added. Furthermore, APA was significantly lower in the two lakes when phosphate was added compared to the control and the nitrogen addition treatment. The dominance of mixotrophic pbytoplankton and high DOC values suggest that these lakes may be regulated by microbial loop processes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Polar Biology
volume
29
issue
6
pages
487 - 494
publisher
Springer
external identifiers
  • wos:000238425400005
  • scopus:33745727313
ISSN
1432-2056
DOI
10.1007/s00300-005-0079-0
language
English
LU publication?
yes
id
f5a41b53-74bf-4fa4-8189-4f231218aa56 (old id 159671)
date added to LUP
2007-06-28 12:34:19
date last changed
2019-08-28 01:50:09
@article{f5a41b53-74bf-4fa4-8189-4f231218aa56,
  abstract     = {We investigated whether phytoplankton communities in two lakes in SW Greenland were phosphorus or nitrogen limited. The study lakes have contrasting water chemistry (mean conductivities differ ten fold) and are located near Kangerlussuaq, SW Greenland (similar to 67 degrees N, 51 degrees W). A microcosm nutrient enrichment experiment was performed in June 2003 to determine whether nitrate or phosphate addition stimulated phytoplankton growth. Samples were analysed for species composition, biomass, and alkaline phosphatase activity (APA). Initially, both lakes had extremely low total phosphorus but high total nitrogen concentrations and high APA, suggesting that the phytoplankton were phosphorus limited prior to the start of the experiment. The phytoplankton composition and biomass (mainly Ochromonas spp.) responded to phosphate but not to nitrate addition. In both lakes, chlorophyll a increased significantly when phosphate was added. Furthermore, APA was significantly lower in the two lakes when phosphate was added compared to the control and the nitrogen addition treatment. The dominance of mixotrophic pbytoplankton and high DOC values suggest that these lakes may be regulated by microbial loop processes.},
  author       = {Brutemark, A and Rengefors, Karin and Anderson, N J},
  issn         = {1432-2056},
  language     = {eng},
  number       = {6},
  pages        = {487--494},
  publisher    = {Springer},
  series       = {Polar Biology},
  title        = {An experimental investigation of phytoplankton nutrient limitation in two contrasting low arctic lakes},
  url          = {http://dx.doi.org/10.1007/s00300-005-0079-0},
  volume       = {29},
  year         = {2006},
}