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Internal ecosystem feedbacks enhance nitrogen-fixing cyanobacteria blooms and complicate management in the Baltic Sea

Vahtera, Emil; Conley, Daniel LU ; Gustafsson, Bo G.; Kuosa, Harri; Pitkanen, Heikki; Savchuk, Oleg P.; Tamminen, Timo; Viitasalo, Markku; Voss, Maren and Wasmund, Norbert, et al. (2007) In Ambio 36(2-3). p.186-194
Abstract
Eutrophication of the Baltic Sea has potentially increased the frequency and magnitude of cyanobacteria blooms. Eutrophication leads to increased sedimentation of organic material, increasing the Extent of anoxic bottoms and subsequently increasing the internal phosphorus loading. In addition, the hypoxic water volume displays a negative relationship with the total dissolved inorganic nitrogen pool, suggesting greater overall nitrogen removal with increased hypoxia. Enhanced internal loading of phosphorus and the removal of dissolved inorganic nitrogen leads to lower nitrogen to phosphorus ratios, which are one of the main factors promoting nitrogen-fixing cyanobacteria blooms. Because cyanobacteria blooms in the open waters of the Baltic... (More)
Eutrophication of the Baltic Sea has potentially increased the frequency and magnitude of cyanobacteria blooms. Eutrophication leads to increased sedimentation of organic material, increasing the Extent of anoxic bottoms and subsequently increasing the internal phosphorus loading. In addition, the hypoxic water volume displays a negative relationship with the total dissolved inorganic nitrogen pool, suggesting greater overall nitrogen removal with increased hypoxia. Enhanced internal loading of phosphorus and the removal of dissolved inorganic nitrogen leads to lower nitrogen to phosphorus ratios, which are one of the main factors promoting nitrogen-fixing cyanobacteria blooms. Because cyanobacteria blooms in the open waters of the Baltic Sea seem to be strongly regulated by internal processes, the effects of external nutrient reductions are scale-dependent. During longer time scales, reductions in external phosphorus load may reduce cyanobacteria blooms; however, on shorter time scales the internal phosphorus loading can counteract external phosphorus reductions. The coupled processes inducing internal loading, nitrogen removal, and the prevalence of nitrogen-fixing cyanobacteria can qualitatively be described as a potentially self-sustaining "vicious circle." To effectively reduce cyanobacteria blooms and overall signs of eutrophication, reductions in both nitrogen and phosphorus external loads appear essential. (Less)
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type
Contribution to journal
publication status
published
subject
in
Ambio
volume
36
issue
2-3
pages
186 - 194
publisher
Springer
external identifiers
  • wos:000246324000013
  • scopus:34250630785
ISSN
0044-7447
DOI
10.1579/0044-7447(2007)36[186:IEFENC]2.0.CO;2
language
English
LU publication?
yes
id
3ec9743b-47ac-456c-9303-1efca723f22b (old id 660648)
date added to LUP
2007-12-19 11:29:42
date last changed
2017-11-19 04:06:47
@article{3ec9743b-47ac-456c-9303-1efca723f22b,
  abstract     = {Eutrophication of the Baltic Sea has potentially increased the frequency and magnitude of cyanobacteria blooms. Eutrophication leads to increased sedimentation of organic material, increasing the Extent of anoxic bottoms and subsequently increasing the internal phosphorus loading. In addition, the hypoxic water volume displays a negative relationship with the total dissolved inorganic nitrogen pool, suggesting greater overall nitrogen removal with increased hypoxia. Enhanced internal loading of phosphorus and the removal of dissolved inorganic nitrogen leads to lower nitrogen to phosphorus ratios, which are one of the main factors promoting nitrogen-fixing cyanobacteria blooms. Because cyanobacteria blooms in the open waters of the Baltic Sea seem to be strongly regulated by internal processes, the effects of external nutrient reductions are scale-dependent. During longer time scales, reductions in external phosphorus load may reduce cyanobacteria blooms; however, on shorter time scales the internal phosphorus loading can counteract external phosphorus reductions. The coupled processes inducing internal loading, nitrogen removal, and the prevalence of nitrogen-fixing cyanobacteria can qualitatively be described as a potentially self-sustaining "vicious circle." To effectively reduce cyanobacteria blooms and overall signs of eutrophication, reductions in both nitrogen and phosphorus external loads appear essential.},
  author       = {Vahtera, Emil and Conley, Daniel and Gustafsson, Bo G. and Kuosa, Harri and Pitkanen, Heikki and Savchuk, Oleg P. and Tamminen, Timo and Viitasalo, Markku and Voss, Maren and Wasmund, Norbert and Wulff, Fredrik},
  issn         = {0044-7447},
  language     = {eng},
  number       = {2-3},
  pages        = {186--194},
  publisher    = {Springer},
  series       = {Ambio},
  title        = {Internal ecosystem feedbacks enhance nitrogen-fixing cyanobacteria blooms and complicate management in the Baltic Sea},
  url          = {http://dx.doi.org/10.1579/0044-7447(2007)36[186:IEFENC]2.0.CO;2},
  volume       = {36},
  year         = {2007},
}