Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms
A mesocosm experiment was conducted to investigate the impact of risingfCO2 on the build-up and decline of organic matter during coastal phytoplankton blooms. Five mesocosms (∼38 m³ each) were deployed in the Baltic Sea during spring (2009) and enriched with CO2 to yield a gradient of 355–862 µatm....
Published in: | Journal of Plankton Research |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://epubs.scu.edu.au/esm_pubs/2897 https://doi.org/10.1093/plankt/fbt125 |
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ftsoutherncu:oai:epubs.scu.edu.au:esm_pubs-3914 2023-05-15T17:51:30+02:00 Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms Engel, Anja Piontek, Judith Grossart, Hans-Peter Riebessell, Ulf Schulz, Kai G Sperling, Martin 2014-01-01T08:00:00Z https://epubs.scu.edu.au/esm_pubs/2897 https://doi.org/10.1093/plankt/fbt125 unknown ePublications@SCU School of Environment, Science and Engineering Papers mesocosm; ocean acidification; phytoplankton; organic matter; TEP Environmental Sciences article 2014 ftsoutherncu https://doi.org/10.1093/plankt/fbt125 2019-08-06T12:54:28Z A mesocosm experiment was conducted to investigate the impact of risingfCO2 on the build-up and decline of organic matter during coastal phytoplankton blooms. Five mesocosms (∼38 m³ each) were deployed in the Baltic Sea during spring (2009) and enriched with CO2 to yield a gradient of 355–862 µatm. Mesocosms were nutrient fertilized initially to induce phytoplankton bloom development. Changes in particulate and dissolved organic matter concentrations, including dissolved high-molecular weight (>1 kDa) combined carbohydrates, dissolved free and combined amino acids as well as transparent exopolymer particles (TEP), were monitored over 21 days together with bacterial abundance, and hydrolytic extracellular enzyme activities. Overall, organic matter followed well-known bloom dynamics in all CO2 treatments alike. At high fCO2,higher ΔPOC:ΔPON during bloom rise, and higher TEP concentrations during bloom peak, suggested preferential accumulation of carbon-rich components. TEP concentration at bloom peak was significantly related to subsequent sedimentation of particulate organic matter. Bacterial abundance increased during the bloom and was highest at high fCO2. We conclude that increasing fCO2 supports production and exudation of carbon-rich components, enhancing particle aggregation and settling, but also providing substrate and attachment sites for bacteria. More labile organic carbon and higher bacterial abundance can increase rates of oxygen consumption and may intensify the already high risk of oxygen depletion in coastal seas in the future. Article in Journal/Newspaper Ocean acidification Southern Cross University: epublications@SCU Journal of Plankton Research 36 3 641 657 |
institution |
Open Polar |
collection |
Southern Cross University: epublications@SCU |
op_collection_id |
ftsoutherncu |
language |
unknown |
topic |
mesocosm; ocean acidification; phytoplankton; organic matter; TEP Environmental Sciences |
spellingShingle |
mesocosm; ocean acidification; phytoplankton; organic matter; TEP Environmental Sciences Engel, Anja Piontek, Judith Grossart, Hans-Peter Riebessell, Ulf Schulz, Kai G Sperling, Martin Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms |
topic_facet |
mesocosm; ocean acidification; phytoplankton; organic matter; TEP Environmental Sciences |
description |
A mesocosm experiment was conducted to investigate the impact of risingfCO2 on the build-up and decline of organic matter during coastal phytoplankton blooms. Five mesocosms (∼38 m³ each) were deployed in the Baltic Sea during spring (2009) and enriched with CO2 to yield a gradient of 355–862 µatm. Mesocosms were nutrient fertilized initially to induce phytoplankton bloom development. Changes in particulate and dissolved organic matter concentrations, including dissolved high-molecular weight (>1 kDa) combined carbohydrates, dissolved free and combined amino acids as well as transparent exopolymer particles (TEP), were monitored over 21 days together with bacterial abundance, and hydrolytic extracellular enzyme activities. Overall, organic matter followed well-known bloom dynamics in all CO2 treatments alike. At high fCO2,higher ΔPOC:ΔPON during bloom rise, and higher TEP concentrations during bloom peak, suggested preferential accumulation of carbon-rich components. TEP concentration at bloom peak was significantly related to subsequent sedimentation of particulate organic matter. Bacterial abundance increased during the bloom and was highest at high fCO2. We conclude that increasing fCO2 supports production and exudation of carbon-rich components, enhancing particle aggregation and settling, but also providing substrate and attachment sites for bacteria. More labile organic carbon and higher bacterial abundance can increase rates of oxygen consumption and may intensify the already high risk of oxygen depletion in coastal seas in the future. |
format |
Article in Journal/Newspaper |
author |
Engel, Anja Piontek, Judith Grossart, Hans-Peter Riebessell, Ulf Schulz, Kai G Sperling, Martin |
author_facet |
Engel, Anja Piontek, Judith Grossart, Hans-Peter Riebessell, Ulf Schulz, Kai G Sperling, Martin |
author_sort |
Engel, Anja |
title |
Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms |
title_short |
Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms |
title_full |
Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms |
title_fullStr |
Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms |
title_full_unstemmed |
Impact of CO2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms |
title_sort |
impact of co2 enrichment on organic matter dynamics during nutrient induced coastal phytoplankton blooms |
publisher |
ePublications@SCU |
publishDate |
2014 |
url |
https://epubs.scu.edu.au/esm_pubs/2897 https://doi.org/10.1093/plankt/fbt125 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
School of Environment, Science and Engineering Papers |
op_doi |
https://doi.org/10.1093/plankt/fbt125 |
container_title |
Journal of Plankton Research |
container_volume |
36 |
container_issue |
3 |
container_start_page |
641 |
op_container_end_page |
657 |
_version_ |
1766158658726526976 |