Response of bacterioplankton activity in an Arctic fjord system to elevated p CO 2 : results from a mesocosm perturbation study
The effect of elevated seawater carbon dioxide (CO 2 ) on the activity of a natural bacterioplankton community in an Arctic fjord system was investigated by a mesocosm perturbation study in the frame of the European Project on Ocean Acidification (EPOCA). A p CO 2 range of 175–1085 μatm was set up i...
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ftdoajarticles:oai:doaj.org/article:d2473e0f44924d8ebe5635df222bd281 2023-05-15T14:59:11+02:00 Response of bacterioplankton activity in an Arctic fjord system to elevated p CO 2 : results from a mesocosm perturbation study U. Riebesell A. Engel K. G. Schulz M. Sperling C. Borchard J. Piontek 2013-01-01T00:00:00Z https://doi.org/10.5194/bg-10-297-2013 https://doaj.org/article/d2473e0f44924d8ebe5635df222bd281 EN eng Copernicus Publications http://www.biogeosciences.net/10/297/2013/bg-10-297-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-297-2013 1726-4170 1726-4189 https://doaj.org/article/d2473e0f44924d8ebe5635df222bd281 Biogeosciences, Vol 10, Iss 1, Pp 297-314 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-297-2013 2022-12-31T02:16:57Z The effect of elevated seawater carbon dioxide (CO 2 ) on the activity of a natural bacterioplankton community in an Arctic fjord system was investigated by a mesocosm perturbation study in the frame of the European Project on Ocean Acidification (EPOCA). A p CO 2 range of 175–1085 μatm was set up in nine mesocosms deployed in the Kongsfjorden (Svalbard). The activity of natural extracellular enzyme assemblages increased in response to acidification. Rates of β-glucosidase and leucine-aminopeptidase increased along the gradient of mesocosm p CO 2 . A decrease in seawater pH of 0.5 units almost doubled rates of both enzymes. Heterotrophic bacterial activity was closely coupled to phytoplankton productivity in this experiment. The bacterioplankton community responded to rising chlorophyll a concentrations after a lag phase of only a few days with increasing protein production and extracellular enzyme activity. Time-integrated primary production and bacterial protein production were positively correlated, strongly suggesting that higher amounts of phytoplankton-derived organic matter were assimilated by heterotrophic bacteria at increased primary production. Primary production increased under high p CO 2 in this study, and it can be suggested that the efficient heterotrophic carbon utilisation had the potential to counteract the enhanced autotrophic CO 2 fixation. However, our results also show that beneficial p CO 2 -related effects on bacterial activity can be mitigated by the top-down control of bacterial abundances in natural microbial communities. Article in Journal/Newspaper Arctic Kongsfjord* Kongsfjorden Ocean acidification Phytoplankton Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Biogeosciences 10 1 297 314 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 U. Riebesell A. Engel K. G. Schulz M. Sperling C. Borchard J. Piontek Response of bacterioplankton activity in an Arctic fjord system to elevated p CO 2 : results from a mesocosm perturbation study |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The effect of elevated seawater carbon dioxide (CO 2 ) on the activity of a natural bacterioplankton community in an Arctic fjord system was investigated by a mesocosm perturbation study in the frame of the European Project on Ocean Acidification (EPOCA). A p CO 2 range of 175–1085 μatm was set up in nine mesocosms deployed in the Kongsfjorden (Svalbard). The activity of natural extracellular enzyme assemblages increased in response to acidification. Rates of β-glucosidase and leucine-aminopeptidase increased along the gradient of mesocosm p CO 2 . A decrease in seawater pH of 0.5 units almost doubled rates of both enzymes. Heterotrophic bacterial activity was closely coupled to phytoplankton productivity in this experiment. The bacterioplankton community responded to rising chlorophyll a concentrations after a lag phase of only a few days with increasing protein production and extracellular enzyme activity. Time-integrated primary production and bacterial protein production were positively correlated, strongly suggesting that higher amounts of phytoplankton-derived organic matter were assimilated by heterotrophic bacteria at increased primary production. Primary production increased under high p CO 2 in this study, and it can be suggested that the efficient heterotrophic carbon utilisation had the potential to counteract the enhanced autotrophic CO 2 fixation. However, our results also show that beneficial p CO 2 -related effects on bacterial activity can be mitigated by the top-down control of bacterial abundances in natural microbial communities. |
format |
Article in Journal/Newspaper |
author |
U. Riebesell A. Engel K. G. Schulz M. Sperling C. Borchard J. Piontek |
author_facet |
U. Riebesell A. Engel K. G. Schulz M. Sperling C. Borchard J. Piontek |
author_sort |
U. Riebesell |
title |
Response of bacterioplankton activity in an Arctic fjord system to elevated p CO 2 : results from a mesocosm perturbation study |
title_short |
Response of bacterioplankton activity in an Arctic fjord system to elevated p CO 2 : results from a mesocosm perturbation study |
title_full |
Response of bacterioplankton activity in an Arctic fjord system to elevated p CO 2 : results from a mesocosm perturbation study |
title_fullStr |
Response of bacterioplankton activity in an Arctic fjord system to elevated p CO 2 : results from a mesocosm perturbation study |
title_full_unstemmed |
Response of bacterioplankton activity in an Arctic fjord system to elevated p CO 2 : results from a mesocosm perturbation study |
title_sort |
response of bacterioplankton activity in an arctic fjord system to elevated p co 2 : results from a mesocosm perturbation study |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-297-2013 https://doaj.org/article/d2473e0f44924d8ebe5635df222bd281 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Kongsfjord* Kongsfjorden Ocean acidification Phytoplankton Svalbard |
genre_facet |
Arctic Kongsfjord* Kongsfjorden Ocean acidification Phytoplankton Svalbard |
op_source |
Biogeosciences, Vol 10, Iss 1, Pp 297-314 (2013) |
op_relation |
http://www.biogeosciences.net/10/297/2013/bg-10-297-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-297-2013 1726-4170 1726-4189 https://doaj.org/article/d2473e0f44924d8ebe5635df222bd281 |
op_doi |
https://doi.org/10.5194/bg-10-297-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
1 |
container_start_page |
297 |
op_container_end_page |
314 |
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1766331317108080640 |