Indirect link between riverine dissolved organic matter and bacterioplankton respiration in a boreal estuary
(2019) In Marine Environmental Research 148. p.39-45- Abstract
- Increasing loading of terrestrially derived dissolved organic matter tends to enhance bacterioplankton respiration (BR) in boreal estuaries, but knowledge on the mechanisms behind this effect is not complete. We determined the stable isotopic signature of the reactive estuarine dissolved organic carbon (DOC) in the Öre estuary (Baltic Sea) by using the Keeling plot method. The δ13C ratio of the estuarine labile DOC varied from −26.0‰ to −18.7‰ with most values resembling those typical for DOC of coastal phytoplanktonic origin (−18 to −24‰), while being distinctly higher than those of DOC from terrestrial sources (−28‰ to −27‰). Furthermore, the δ13C of the respired carbon was positively correlated to DOC concentrations, indicating that... (More)
- Increasing loading of terrestrially derived dissolved organic matter tends to enhance bacterioplankton respiration (BR) in boreal estuaries, but knowledge on the mechanisms behind this effect is not complete. We determined the stable isotopic signature of the reactive estuarine dissolved organic carbon (DOC) in the Öre estuary (Baltic Sea) by using the Keeling plot method. The δ13C ratio of the estuarine labile DOC varied from −26.0‰ to −18.7‰ with most values resembling those typical for DOC of coastal phytoplanktonic origin (−18 to −24‰), while being distinctly higher than those of DOC from terrestrial sources (−28‰ to −27‰). Furthermore, the δ13C of the respired carbon was positively correlated to DOC concentrations, indicating that carbon of marine origin increasingly dominated the reactive substrates when input of organic matter into the estuary became higher. This suggests that riverine organic matter mainly affects BR indirectly, by providing nutrients that stimulate the production of phytoplankton-derived reactive DOC in the estuary. Thus, riverine derived DOC per se may not be as important for coastal CO2 emissions as previously thought. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/17787138-2428-4121-90ca-da1f5ed5032d
- author
- Soares, Ana LU and Berggren, Martin LU
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Riverine dissolved organic matter, Dissolved organic carbon, Bacterial respiration, Baltic sea, Carbon isotopes, Bacterioplankton, Primary production, Carbon cycling
- in
- Marine Environmental Research
- volume
- 148
- pages
- 7 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85065249380
- pmid:31078961
- ISSN
- 0141-1136
- DOI
- 10.1016/j.marenvres.2019.04.009
- language
- English
- LU publication?
- yes
- id
- 17787138-2428-4121-90ca-da1f5ed5032d
- date added to LUP
- 2019-05-16 11:37:42
- date last changed
- 2022-04-25 23:49:34
@article{17787138-2428-4121-90ca-da1f5ed5032d, abstract = {{Increasing loading of terrestrially derived dissolved organic matter tends to enhance bacterioplankton respiration (BR) in boreal estuaries, but knowledge on the mechanisms behind this effect is not complete. We determined the stable isotopic signature of the reactive estuarine dissolved organic carbon (DOC) in the Öre estuary (Baltic Sea) by using the Keeling plot method. The δ13C ratio of the estuarine labile DOC varied from −26.0‰ to −18.7‰ with most values resembling those typical for DOC of coastal phytoplanktonic origin (−18 to −24‰), while being distinctly higher than those of DOC from terrestrial sources (−28‰ to −27‰). Furthermore, the δ13C of the respired carbon was positively correlated to DOC concentrations, indicating that carbon of marine origin increasingly dominated the reactive substrates when input of organic matter into the estuary became higher. This suggests that riverine organic matter mainly affects BR indirectly, by providing nutrients that stimulate the production of phytoplankton-derived reactive DOC in the estuary. Thus, riverine derived DOC per se may not be as important for coastal CO2 emissions as previously thought.}}, author = {{Soares, Ana and Berggren, Martin}}, issn = {{0141-1136}}, keywords = {{Riverine dissolved organic matter; Dissolved organic carbon; Bacterial respiration; Baltic sea; Carbon isotopes; Bacterioplankton; Primary production; Carbon cycling}}, language = {{eng}}, pages = {{39--45}}, publisher = {{Elsevier}}, series = {{Marine Environmental Research}}, title = {{Indirect link between riverine dissolved organic matter and bacterioplankton respiration in a boreal estuary}}, url = {{http://dx.doi.org/10.1016/j.marenvres.2019.04.009}}, doi = {{10.1016/j.marenvres.2019.04.009}}, volume = {{148}}, year = {{2019}}, }