Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation
Dissolved organic matter (DOM) represents a major reservoir of carbon in the oceans. Environmental stressors such as ocean acidification (OA) potentially affect DOM production and degradation processes, e.g., phytoplankton exudation or microbial uptake and biotransformation of molecules. Resulting c...
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ftdoajarticles:oai:doaj.org/article:abbfe0fa56cb421a9b34657b8c1f11e9 2023-05-15T17:32:35+02:00 Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation Maren Zark Nadine K. Broda Thomas Hornick Hans-Peter Grossart Ulf Riebesell Thorsten Dittmar 2017-09-01T00:00:00Z https://doi.org/10.3389/fmars.2017.00271 https://doaj.org/article/abbfe0fa56cb421a9b34657b8c1f11e9 EN eng Frontiers Media S.A. http://journal.frontiersin.org/article/10.3389/fmars.2017.00271/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2017.00271 https://doaj.org/article/abbfe0fa56cb421a9b34657b8c1f11e9 Frontiers in Marine Science, Vol 4 (2017) dissolved organic matter ocean acidification ultrahigh resolution mass spectrometry FT-ICR-MS molecular composition subtropical North Atlantic Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2017 ftdoajarticles https://doi.org/10.3389/fmars.2017.00271 2022-12-31T14:57:07Z Dissolved organic matter (DOM) represents a major reservoir of carbon in the oceans. Environmental stressors such as ocean acidification (OA) potentially affect DOM production and degradation processes, e.g., phytoplankton exudation or microbial uptake and biotransformation of molecules. Resulting changes in carbon storage capacity of the ocean, thus, may cause feedbacks on the global carbon cycle. Previous experiments studying OA effects on the DOM pool under natural conditions, however, were mostly conducted in temperate and coastal eutrophic areas. Here, we report on OA effects on the existing and newly produced DOM pool during an experiment in the subtropical North Atlantic Ocean at the Canary Islands during an (1) oligotrophic phase and (2) after simulated deep water upwelling. The last is a frequently occurring event in this region controlling nutrient and phytoplankton dynamics. We manipulated nine large-scale mesocosms with a gradient of pCO2 ranging from ~350 up to ~1,030 μatm and monitored the DOM molecular composition using ultrahigh-resolution mass spectrometry via Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). An increase of 37 μmol L−1 DOC was observed in all mesocosms during a phytoplankton bloom induced by simulated upwelling. Indications for enhanced DOC accumulation under elevated CO2 became apparent during a phase of nutrient recycling toward the end of the experiment. The production of DOM was reflected in changes of the molecular DOM composition. Out of the 7,212 molecular formulae, which were detected throughout the experiment, ~50% correlated significantly in mass spectrometric signal intensity with cumulative bacterial protein production (BPP) and are likely a product of microbial transformation. However, no differences in the produced compounds were found with respect to CO2 levels. Comparing the results of this experiment with a comparable OA experiment in the Swedish Gullmar Fjord, reveals similar succession patterns for individual compound pools during a ... Article in Journal/Newspaper North Atlantic Ocean acidification Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 4 |
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Open Polar |
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language |
English |
topic |
dissolved organic matter ocean acidification ultrahigh resolution mass spectrometry FT-ICR-MS molecular composition subtropical North Atlantic Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
dissolved organic matter ocean acidification ultrahigh resolution mass spectrometry FT-ICR-MS molecular composition subtropical North Atlantic Science Q General. Including nature conservation geographical distribution QH1-199.5 Maren Zark Nadine K. Broda Thomas Hornick Hans-Peter Grossart Ulf Riebesell Thorsten Dittmar Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
topic_facet |
dissolved organic matter ocean acidification ultrahigh resolution mass spectrometry FT-ICR-MS molecular composition subtropical North Atlantic Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Dissolved organic matter (DOM) represents a major reservoir of carbon in the oceans. Environmental stressors such as ocean acidification (OA) potentially affect DOM production and degradation processes, e.g., phytoplankton exudation or microbial uptake and biotransformation of molecules. Resulting changes in carbon storage capacity of the ocean, thus, may cause feedbacks on the global carbon cycle. Previous experiments studying OA effects on the DOM pool under natural conditions, however, were mostly conducted in temperate and coastal eutrophic areas. Here, we report on OA effects on the existing and newly produced DOM pool during an experiment in the subtropical North Atlantic Ocean at the Canary Islands during an (1) oligotrophic phase and (2) after simulated deep water upwelling. The last is a frequently occurring event in this region controlling nutrient and phytoplankton dynamics. We manipulated nine large-scale mesocosms with a gradient of pCO2 ranging from ~350 up to ~1,030 μatm and monitored the DOM molecular composition using ultrahigh-resolution mass spectrometry via Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). An increase of 37 μmol L−1 DOC was observed in all mesocosms during a phytoplankton bloom induced by simulated upwelling. Indications for enhanced DOC accumulation under elevated CO2 became apparent during a phase of nutrient recycling toward the end of the experiment. The production of DOM was reflected in changes of the molecular DOM composition. Out of the 7,212 molecular formulae, which were detected throughout the experiment, ~50% correlated significantly in mass spectrometric signal intensity with cumulative bacterial protein production (BPP) and are likely a product of microbial transformation. However, no differences in the produced compounds were found with respect to CO2 levels. Comparing the results of this experiment with a comparable OA experiment in the Swedish Gullmar Fjord, reveals similar succession patterns for individual compound pools during a ... |
format |
Article in Journal/Newspaper |
author |
Maren Zark Nadine K. Broda Thomas Hornick Hans-Peter Grossart Ulf Riebesell Thorsten Dittmar |
author_facet |
Maren Zark Nadine K. Broda Thomas Hornick Hans-Peter Grossart Ulf Riebesell Thorsten Dittmar |
author_sort |
Maren Zark |
title |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_short |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_full |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_fullStr |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_full_unstemmed |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_sort |
ocean acidification experiments in large-scale mesocosms reveal similar dynamics of dissolved organic matter production and biotransformation |
publisher |
Frontiers Media S.A. |
publishDate |
2017 |
url |
https://doi.org/10.3389/fmars.2017.00271 https://doaj.org/article/abbfe0fa56cb421a9b34657b8c1f11e9 |
genre |
North Atlantic Ocean acidification |
genre_facet |
North Atlantic Ocean acidification |
op_source |
Frontiers in Marine Science, Vol 4 (2017) |
op_relation |
http://journal.frontiersin.org/article/10.3389/fmars.2017.00271/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2017.00271 https://doaj.org/article/abbfe0fa56cb421a9b34657b8c1f11e9 |
op_doi |
https://doi.org/10.3389/fmars.2017.00271 |
container_title |
Frontiers in Marine Science |
container_volume |
4 |
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1766130767752069120 |