Ocean acidification impacts bacteria–phytoplankton coupling at low-nutrient conditions
The oceans absorb about a quarter of the annually produced anthropogenic atmospheric carbon dioxide (CO2), resulting in a decrease in surface water pH, a process termed ocean acidification (OA). Surprisingly little is known about how OA affects the physiology of heterotrophic bacteria or the couplin...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00010991 2023-05-15T17:50:55+02:00 Ocean acidification impacts bacteria–phytoplankton coupling at low-nutrient conditions Hornick, Thomas Bach, Lennart T. Crawfurd, Katharine J. Spilling, Kristian Achterberg, Eric P. Woodhouse, Jason N. Schulz, Kai G. Brussaard, Corina P. D. Riebesell, Ulf Grossart, Hans-Peter 2017-01 electronic https://doi.org/10.5194/bg-14-1-2017 https://noa.gwlb.de/receive/cop_mods_00010991 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010948/bg-14-1-2017.pdf https://bg.copernicus.org/articles/14/1/2017/bg-14-1-2017.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-14-1-2017 https://noa.gwlb.de/receive/cop_mods_00010991 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010948/bg-14-1-2017.pdf https://bg.copernicus.org/articles/14/1/2017/bg-14-1-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/bg-14-1-2017 2022-02-08T22:56:43Z The oceans absorb about a quarter of the annually produced anthropogenic atmospheric carbon dioxide (CO2), resulting in a decrease in surface water pH, a process termed ocean acidification (OA). Surprisingly little is known about how OA affects the physiology of heterotrophic bacteria or the coupling of heterotrophic bacteria to phytoplankton when nutrients are limited. Previous experiments were, for the most part, undertaken during productive phases or following nutrient additions designed to stimulate algal blooms. Therefore, we performed an in situ large-volume mesocosm ( ∼ 55 m3) experiment in the Baltic Sea by simulating different fugacities of CO2 (fCO2) extending from present to future conditions. The study was conducted in July–August after the nominal spring bloom, in order to maintain low-nutrient conditions throughout the experiment. This resulted in phytoplankton communities dominated by small-sized functional groups (picophytoplankton). There was no consistent fCO2-induced effect on bacterial protein production (BPP), cell-specific BPP (csBPP) or biovolumes (BVs) of either free-living (FL) or particle-associated (PA) heterotrophic bacteria, when considered as individual components (univariate analyses). Permutational Multivariate Analysis of Variance (PERMANOVA) revealed a significant effect of the fCO2 treatment on entire assemblages of dissolved and particulate nutrients, metabolic parameters and the bacteria–phytoplankton community. However, distance-based linear modelling only identified fCO2 as a factor explaining the variability observed amongst the microbial community composition, but not for explaining variability within the metabolic parameters. This suggests that fCO2 impacts on microbial metabolic parameters occurred indirectly through varying physicochemical parameters and microbial species composition. Cluster analyses examining the co-occurrence of different functional groups of bacteria and phytoplankton further revealed a separation of the four fCO2-treated mesocosms from both control mesocosms, indicating that complex trophic interactions might be altered in a future acidified ocean. Possible consequences for nutrient cycling and carbon export are still largely unknown, in particular in a nutrient-limited ocean. Article in Journal/Newspaper Ocean acidification Niedersächsisches Online-Archiv NOA Biogeosciences 14 1 1 15 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Hornick, Thomas Bach, Lennart T. Crawfurd, Katharine J. Spilling, Kristian Achterberg, Eric P. Woodhouse, Jason N. Schulz, Kai G. Brussaard, Corina P. D. Riebesell, Ulf Grossart, Hans-Peter Ocean acidification impacts bacteria–phytoplankton coupling at low-nutrient conditions |
topic_facet |
article Verlagsveröffentlichung |
description |
The oceans absorb about a quarter of the annually produced anthropogenic atmospheric carbon dioxide (CO2), resulting in a decrease in surface water pH, a process termed ocean acidification (OA). Surprisingly little is known about how OA affects the physiology of heterotrophic bacteria or the coupling of heterotrophic bacteria to phytoplankton when nutrients are limited. Previous experiments were, for the most part, undertaken during productive phases or following nutrient additions designed to stimulate algal blooms. Therefore, we performed an in situ large-volume mesocosm ( ∼ 55 m3) experiment in the Baltic Sea by simulating different fugacities of CO2 (fCO2) extending from present to future conditions. The study was conducted in July–August after the nominal spring bloom, in order to maintain low-nutrient conditions throughout the experiment. This resulted in phytoplankton communities dominated by small-sized functional groups (picophytoplankton). There was no consistent fCO2-induced effect on bacterial protein production (BPP), cell-specific BPP (csBPP) or biovolumes (BVs) of either free-living (FL) or particle-associated (PA) heterotrophic bacteria, when considered as individual components (univariate analyses). Permutational Multivariate Analysis of Variance (PERMANOVA) revealed a significant effect of the fCO2 treatment on entire assemblages of dissolved and particulate nutrients, metabolic parameters and the bacteria–phytoplankton community. However, distance-based linear modelling only identified fCO2 as a factor explaining the variability observed amongst the microbial community composition, but not for explaining variability within the metabolic parameters. This suggests that fCO2 impacts on microbial metabolic parameters occurred indirectly through varying physicochemical parameters and microbial species composition. Cluster analyses examining the co-occurrence of different functional groups of bacteria and phytoplankton further revealed a separation of the four fCO2-treated mesocosms from both control mesocosms, indicating that complex trophic interactions might be altered in a future acidified ocean. Possible consequences for nutrient cycling and carbon export are still largely unknown, in particular in a nutrient-limited ocean. |
format |
Article in Journal/Newspaper |
author |
Hornick, Thomas Bach, Lennart T. Crawfurd, Katharine J. Spilling, Kristian Achterberg, Eric P. Woodhouse, Jason N. Schulz, Kai G. Brussaard, Corina P. D. Riebesell, Ulf Grossart, Hans-Peter |
author_facet |
Hornick, Thomas Bach, Lennart T. Crawfurd, Katharine J. Spilling, Kristian Achterberg, Eric P. Woodhouse, Jason N. Schulz, Kai G. Brussaard, Corina P. D. Riebesell, Ulf Grossart, Hans-Peter |
author_sort |
Hornick, Thomas |
title |
Ocean acidification impacts bacteria–phytoplankton coupling at low-nutrient conditions |
title_short |
Ocean acidification impacts bacteria–phytoplankton coupling at low-nutrient conditions |
title_full |
Ocean acidification impacts bacteria–phytoplankton coupling at low-nutrient conditions |
title_fullStr |
Ocean acidification impacts bacteria–phytoplankton coupling at low-nutrient conditions |
title_full_unstemmed |
Ocean acidification impacts bacteria–phytoplankton coupling at low-nutrient conditions |
title_sort |
ocean acidification impacts bacteria–phytoplankton coupling at low-nutrient conditions |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/bg-14-1-2017 https://noa.gwlb.de/receive/cop_mods_00010991 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010948/bg-14-1-2017.pdf https://bg.copernicus.org/articles/14/1/2017/bg-14-1-2017.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-14-1-2017 https://noa.gwlb.de/receive/cop_mods_00010991 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010948/bg-14-1-2017.pdf https://bg.copernicus.org/articles/14/1/2017/bg-14-1-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-14-1-2017 |
container_title |
Biogeosciences |
container_volume |
14 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
15 |
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1766157863424622592 |