Brownification reduces oxygen gross primary production and community respiration and changes the phytoplankton community composition: An in situ mesocosm experiment with high‐frequency sensor measurements in a North Atlantic bay
Abstract In recent decades, the increase in terrestrial inputs to freshwater and coastal ecosystems, especially occurring at northern latitudes, has led to a process of water color darkening known as “brownification.” To assess how brownification affects plankton community composition and functionin...
Published in: | Limnology and Oceanography |
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crwiley:10.1002/lno.12041 2024-09-30T14:39:27+00:00 Brownification reduces oxygen gross primary production and community respiration and changes the phytoplankton community composition: An in situ mesocosm experiment with high‐frequency sensor measurements in a North Atlantic bay Soulié, Tanguy Stibor, Herwig Mas, Sébastien Braun, Benjamin Knechtel, Johanna Nejstgaard, Jens C. Sommer, Ulrich Vidussi, Francesca Mostajir, Behzad 2022 http://dx.doi.org/10.1002/lno.12041 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12041 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.12041 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12041 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Limnology and Oceanography volume 67, issue 4, page 874-887 ISSN 0024-3590 1939-5590 journal-article 2022 crwiley https://doi.org/10.1002/lno.12041 2024-09-11T04:16:34Z Abstract In recent decades, the increase in terrestrial inputs to freshwater and coastal ecosystems, especially occurring at northern latitudes, has led to a process of water color darkening known as “brownification.” To assess how brownification affects plankton community composition and functioning in northern coastal areas, an in situ mesocosm experiment using a highly colored humic substance to simulate a brownification event was performed in a North Atlantic bay (Hopavågen, Norway) in August 2019. Manual sampling for analyses of nutrient concentrations, phytoplankton pigments and zooplankton abundances was combined with high‐frequency (every 15 min) monitoring of key environmental variables to investigate the response of the plankton community in terms of oxygen metabolism and community composition. In response to brownification, the oxygen gross primary production (GPP) and community respiration (R) slowed down significantly, by almost one‐third. However, GPP and R both decreased to the same extent; thus, the oxygen metabolic balance was not affected. Moreover, the chlorophyll‐ a concentration significantly decreased under brownification, by 9% on average, and the chemotaxonomic pigment composition of the phytoplankton changed, indicating their acclimation to the reduced light availability. In addition, brownification seemed to favor appendicularians, the dominant mesozooplankton group in the mesocosms, which potentially contributed to lowering the phytoplankton biomass. In conclusion, the results of this in situ mesocosm experiment suggest that brownification could induce significant changes in phytoplankton and zooplankton community composition and significantly alter the overall oxygen metabolism of plankton communities in a northern Atlantic bay. Article in Journal/Newspaper North Atlantic Wiley Online Library Norway Limnology and Oceanography |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract In recent decades, the increase in terrestrial inputs to freshwater and coastal ecosystems, especially occurring at northern latitudes, has led to a process of water color darkening known as “brownification.” To assess how brownification affects plankton community composition and functioning in northern coastal areas, an in situ mesocosm experiment using a highly colored humic substance to simulate a brownification event was performed in a North Atlantic bay (Hopavågen, Norway) in August 2019. Manual sampling for analyses of nutrient concentrations, phytoplankton pigments and zooplankton abundances was combined with high‐frequency (every 15 min) monitoring of key environmental variables to investigate the response of the plankton community in terms of oxygen metabolism and community composition. In response to brownification, the oxygen gross primary production (GPP) and community respiration (R) slowed down significantly, by almost one‐third. However, GPP and R both decreased to the same extent; thus, the oxygen metabolic balance was not affected. Moreover, the chlorophyll‐ a concentration significantly decreased under brownification, by 9% on average, and the chemotaxonomic pigment composition of the phytoplankton changed, indicating their acclimation to the reduced light availability. In addition, brownification seemed to favor appendicularians, the dominant mesozooplankton group in the mesocosms, which potentially contributed to lowering the phytoplankton biomass. In conclusion, the results of this in situ mesocosm experiment suggest that brownification could induce significant changes in phytoplankton and zooplankton community composition and significantly alter the overall oxygen metabolism of plankton communities in a northern Atlantic bay. |
format |
Article in Journal/Newspaper |
author |
Soulié, Tanguy Stibor, Herwig Mas, Sébastien Braun, Benjamin Knechtel, Johanna Nejstgaard, Jens C. Sommer, Ulrich Vidussi, Francesca Mostajir, Behzad |
spellingShingle |
Soulié, Tanguy Stibor, Herwig Mas, Sébastien Braun, Benjamin Knechtel, Johanna Nejstgaard, Jens C. Sommer, Ulrich Vidussi, Francesca Mostajir, Behzad Brownification reduces oxygen gross primary production and community respiration and changes the phytoplankton community composition: An in situ mesocosm experiment with high‐frequency sensor measurements in a North Atlantic bay |
author_facet |
Soulié, Tanguy Stibor, Herwig Mas, Sébastien Braun, Benjamin Knechtel, Johanna Nejstgaard, Jens C. Sommer, Ulrich Vidussi, Francesca Mostajir, Behzad |
author_sort |
Soulié, Tanguy |
title |
Brownification reduces oxygen gross primary production and community respiration and changes the phytoplankton community composition: An in situ mesocosm experiment with high‐frequency sensor measurements in a North Atlantic bay |
title_short |
Brownification reduces oxygen gross primary production and community respiration and changes the phytoplankton community composition: An in situ mesocosm experiment with high‐frequency sensor measurements in a North Atlantic bay |
title_full |
Brownification reduces oxygen gross primary production and community respiration and changes the phytoplankton community composition: An in situ mesocosm experiment with high‐frequency sensor measurements in a North Atlantic bay |
title_fullStr |
Brownification reduces oxygen gross primary production and community respiration and changes the phytoplankton community composition: An in situ mesocosm experiment with high‐frequency sensor measurements in a North Atlantic bay |
title_full_unstemmed |
Brownification reduces oxygen gross primary production and community respiration and changes the phytoplankton community composition: An in situ mesocosm experiment with high‐frequency sensor measurements in a North Atlantic bay |
title_sort |
brownification reduces oxygen gross primary production and community respiration and changes the phytoplankton community composition: an in situ mesocosm experiment with high‐frequency sensor measurements in a north atlantic bay |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/lno.12041 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12041 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.12041 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12041 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Limnology and Oceanography volume 67, issue 4, page 874-887 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/lno.12041 |
container_title |
Limnology and Oceanography |
_version_ |
1811642056763768832 |