Impact of photo-chemical processing of DOC on the bacterioplankton respiratory quotient in aquatic ecosystems
(2016) In Geophysical Research Letters 43(14). p.7538-7545- Abstract
- Many studies assume a respiratory quotient (RQ = molar ratio of CO2 produced to O2 consumed) close to 1 when calculating bacterioplankton respiration. However, evidence suggests that RQ depends on the chemical composition of the respired substrate pool that may be altered by photo-chemical production of oxygen-rich substrates, resulting in elevated RQs. Here we conducted a novel study of the impact of photo-chemical processing of dissolved organic carbon (DOC) on RQ. We monitored the bacterial RQ in bioassays of both ultraviolet light irradiated and non-irradiated humic lake water, using optic gas-pressure sensors. In the experimentally irradiated samples the average RQ value was significantly higher (3.4-3.5 [± 0.4 s.e.]) than that in the... (More)
- Many studies assume a respiratory quotient (RQ = molar ratio of CO2 produced to O2 consumed) close to 1 when calculating bacterioplankton respiration. However, evidence suggests that RQ depends on the chemical composition of the respired substrate pool that may be altered by photo-chemical production of oxygen-rich substrates, resulting in elevated RQs. Here we conducted a novel study of the impact of photo-chemical processing of dissolved organic carbon (DOC) on RQ. We monitored the bacterial RQ in bioassays of both ultraviolet light irradiated and non-irradiated humic lake water, using optic gas-pressure sensors. In the experimentally irradiated samples the average RQ value was significantly higher (3.4-3.5 [± 0.4 s.e.]) than that in the dark controls (1.3 [± 0.1 s.e.]). Our results show that the RQ is systematically higher than 1 when the bacterial metabolism in large part is based on photo-products. By assuming an RQ of 1, bacterioplankton respiration in freshwater ecosystems may be greatly underestimated.
(Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/a074e787-6543-4a51-9dd5-8a34ebe2d264
- author
- Allesson, Lina ; Ström, Lena LU and Berggren, Martin LU
- organization
- publishing date
- 2016-07-28
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geophysical Research Letters
- volume
- 43
- issue
- 14
- pages
- 8 pages
- publisher
- American Geophysical Union (AGU)
- external identifiers
-
- scopus:84982103500
- wos:000383290200031
- ISSN
- 1944-8007
- DOI
- 10.1002/2016GL069621
- language
- English
- LU publication?
- yes
- id
- a074e787-6543-4a51-9dd5-8a34ebe2d264
- date added to LUP
- 2016-07-05 10:24:27
- date last changed
- 2022-04-16 18:20:14
@article{a074e787-6543-4a51-9dd5-8a34ebe2d264, abstract = {{Many studies assume a respiratory quotient (RQ = molar ratio of CO2 produced to O2 consumed) close to 1 when calculating bacterioplankton respiration. However, evidence suggests that RQ depends on the chemical composition of the respired substrate pool that may be altered by photo-chemical production of oxygen-rich substrates, resulting in elevated RQs. Here we conducted a novel study of the impact of photo-chemical processing of dissolved organic carbon (DOC) on RQ. We monitored the bacterial RQ in bioassays of both ultraviolet light irradiated and non-irradiated humic lake water, using optic gas-pressure sensors. In the experimentally irradiated samples the average RQ value was significantly higher (3.4-3.5 [± 0.4 s.e.]) than that in the dark controls (1.3 [± 0.1 s.e.]). Our results show that the RQ is systematically higher than 1 when the bacterial metabolism in large part is based on photo-products. By assuming an RQ of 1, bacterioplankton respiration in freshwater ecosystems may be greatly underestimated.<br/>}}, author = {{Allesson, Lina and Ström, Lena and Berggren, Martin}}, issn = {{1944-8007}}, language = {{eng}}, month = {{07}}, number = {{14}}, pages = {{7538--7545}}, publisher = {{American Geophysical Union (AGU)}}, series = {{Geophysical Research Letters}}, title = {{Impact of photo-chemical processing of DOC on the bacterioplankton respiratory quotient in aquatic ecosystems}}, url = {{http://dx.doi.org/10.1002/2016GL069621}}, doi = {{10.1002/2016GL069621}}, volume = {{43}}, year = {{2016}}, }