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Carbon dioxide reduction by photosynthesis undetectable even during phytoplankton blooms in two lakes

Münzner, Karla LU orcid ; Langenheder, Silke ; Weyhenmeyer, Gesa A. ; Csitári, Bianka and Lindström, Eva S. (2023) In Scientific Reports 13(1).
Abstract

Lakes located in the boreal region are generally supersaturated with carbon dioxide (CO2), which emerges from inflowing inorganic carbon from the surrounding watershed and from mineralization of allochthonous organic carbon. While these CO2 sources gained a lot of attention, processes that reduce the amount of CO2 have been less studied. We therefore examined the CO2 reduction capacity during times of phytoplankton blooms. We investigated partial pressure of CO2 (pCO2) in two lakes at times of blooms dominated by the cyanobacterium Gloeotrichia echinulata (Erken, Sweden) or by the nuisance alga Gonyostomum semen (Erssjön, Sweden) during two years. Our results showed that... (More)

Lakes located in the boreal region are generally supersaturated with carbon dioxide (CO2), which emerges from inflowing inorganic carbon from the surrounding watershed and from mineralization of allochthonous organic carbon. While these CO2 sources gained a lot of attention, processes that reduce the amount of CO2 have been less studied. We therefore examined the CO2 reduction capacity during times of phytoplankton blooms. We investigated partial pressure of CO2 (pCO2) in two lakes at times of blooms dominated by the cyanobacterium Gloeotrichia echinulata (Erken, Sweden) or by the nuisance alga Gonyostomum semen (Erssjön, Sweden) during two years. Our results showed that pCO2 and phytoplankton densities remained unrelated in the two lakes even during blooms. We suggest that physical factors, such as wind-induced water column mixing and import of inorganic carbon via inflowing waters suppressed the phytoplankton signal on pCO2. These results advance our understanding of carbon cycling in lakes and highlight the importance of detailed lake studies for more precise estimates of local, regional and global carbon budgets.

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author
; ; ; and
publishing date
type
Contribution to journal
publication status
published
in
Scientific Reports
volume
13
issue
1
article number
13503
publisher
Nature Publishing Group
external identifiers
  • scopus:85168332746
  • pmid:37598248
ISSN
2045-2322
DOI
10.1038/s41598-023-40596-6
language
English
LU publication?
no
additional info
Publisher Copyright: © 2023, Springer Nature Limited.
id
8f30fe97-31bb-4cc3-aeb0-f4cab5ebdfa3
date added to LUP
2025-10-01 10:42:31
date last changed
2025-10-29 13:29:34
@article{8f30fe97-31bb-4cc3-aeb0-f4cab5ebdfa3,
  abstract     = {{<p>Lakes located in the boreal region are generally supersaturated with carbon dioxide (CO<sub>2</sub>), which emerges from inflowing inorganic carbon from the surrounding watershed and from mineralization of allochthonous organic carbon. While these CO<sub>2</sub> sources gained a lot of attention, processes that reduce the amount of CO<sub>2</sub> have been less studied. We therefore examined the CO<sub>2</sub> reduction capacity during times of phytoplankton blooms. We investigated partial pressure of CO<sub>2</sub> (pCO<sub>2</sub>) in two lakes at times of blooms dominated by the cyanobacterium Gloeotrichia echinulata (Erken, Sweden) or by the nuisance alga Gonyostomum semen (Erssjön, Sweden) during two years. Our results showed that pCO<sub>2</sub> and phytoplankton densities remained unrelated in the two lakes even during blooms. We suggest that physical factors, such as wind-induced water column mixing and import of inorganic carbon via inflowing waters suppressed the phytoplankton signal on pCO<sub>2</sub>. These results advance our understanding of carbon cycling in lakes and highlight the importance of detailed lake studies for more precise estimates of local, regional and global carbon budgets.</p>}},
  author       = {{Münzner, Karla and Langenheder, Silke and Weyhenmeyer, Gesa A. and Csitári, Bianka and Lindström, Eva S.}},
  issn         = {{2045-2322}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Scientific Reports}},
  title        = {{Carbon dioxide reduction by photosynthesis undetectable even during phytoplankton blooms in two lakes}},
  url          = {{http://dx.doi.org/10.1038/s41598-023-40596-6}},
  doi          = {{10.1038/s41598-023-40596-6}},
  volume       = {{13}},
  year         = {{2023}},
}