Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future p CO 2 levels
Abstract Photosynthesis and respiration cause distinct chemical microenvironments within cyanobacterial aggregates. Here, we used microsensors and a diffusion–reaction model to characterize gradients in carbonate chemistry and investigate how these are affected by ocean acidification in Baltic vs. P...
Published in: | Limnology and Oceanography |
---|---|
Main Authors: | , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2021
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/lno.11986 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11986 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11986 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11986 |
id |
crwiley:10.1002/lno.11986 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/lno.11986 2024-06-23T07:55:50+00:00 Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future p CO 2 levels Eichner, Meri Wolf‐Gladrow, Dieter Ploug, Helle Alexander von Humboldt-Stiftung Göteborgs Universitet Kungl. Vetenskaps- och Vitterhets-Samhället i Göteborg Svenska Forskningsrådet Formas 2021 http://dx.doi.org/10.1002/lno.11986 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11986 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11986 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11986 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Limnology and Oceanography volume 67, issue 1, page 203-218 ISSN 0024-3590 1939-5590 journal-article 2021 crwiley https://doi.org/10.1002/lno.11986 2024-06-04T06:43:42Z Abstract Photosynthesis and respiration cause distinct chemical microenvironments within cyanobacterial aggregates. Here, we used microsensors and a diffusion–reaction model to characterize gradients in carbonate chemistry and investigate how these are affected by ocean acidification in Baltic vs. Pacific aggregates ( Nodularia and Dolichospermum vs. Trichodesmium ). Microsensor measurements of O 2 and pH were performed under in situ and expected future p CO 2 levels on Nodularia and Dolichospermum aggregates collected in the Baltic Sea. Under in situ conditions, O 2 and pH levels within the aggregates covered ranges of 80–175% air saturation and 7.7–9.4 in dark and light, respectively. Carbon uptake in the light was predicted to reduce HCO 3 − by 100–150 μ mol L −1 and CO 2 by 3–6 μ mol L −1 in the aggregate center compared to outside, inducing strong CO 2 depletion (down to 0.5 μ mol L −1 CO 2 remaining in the center) even when assuming that HCO 3 − covered 80–90% of carbon uptake. Under ocean acidification conditions, enhanced CO 2 availability allowed for significantly lower activity of carbon concentrating mechanisms, including a reduction of the contribution of HCO 3 − to carbon uptake by up to a factor of 10. The magnification of proton gradients under elevated p CO 2 that was predicted based on a lower buffer capacity was observed in measurements despite a concurrent decrease in photosynthetic activity. In summary, we provide a quantitative image of the inorganic carbon environment in cyanobacterial aggregates under present‐day and expected future conditions, considering both the individual and combined effects of the chemical and biological processes that shape these environments. Article in Journal/Newspaper Ocean acidification Wiley Online Library Pacific Limnology and Oceanography 67 1 203 218 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Photosynthesis and respiration cause distinct chemical microenvironments within cyanobacterial aggregates. Here, we used microsensors and a diffusion–reaction model to characterize gradients in carbonate chemistry and investigate how these are affected by ocean acidification in Baltic vs. Pacific aggregates ( Nodularia and Dolichospermum vs. Trichodesmium ). Microsensor measurements of O 2 and pH were performed under in situ and expected future p CO 2 levels on Nodularia and Dolichospermum aggregates collected in the Baltic Sea. Under in situ conditions, O 2 and pH levels within the aggregates covered ranges of 80–175% air saturation and 7.7–9.4 in dark and light, respectively. Carbon uptake in the light was predicted to reduce HCO 3 − by 100–150 μ mol L −1 and CO 2 by 3–6 μ mol L −1 in the aggregate center compared to outside, inducing strong CO 2 depletion (down to 0.5 μ mol L −1 CO 2 remaining in the center) even when assuming that HCO 3 − covered 80–90% of carbon uptake. Under ocean acidification conditions, enhanced CO 2 availability allowed for significantly lower activity of carbon concentrating mechanisms, including a reduction of the contribution of HCO 3 − to carbon uptake by up to a factor of 10. The magnification of proton gradients under elevated p CO 2 that was predicted based on a lower buffer capacity was observed in measurements despite a concurrent decrease in photosynthetic activity. In summary, we provide a quantitative image of the inorganic carbon environment in cyanobacterial aggregates under present‐day and expected future conditions, considering both the individual and combined effects of the chemical and biological processes that shape these environments. |
author2 |
Alexander von Humboldt-Stiftung Göteborgs Universitet Kungl. Vetenskaps- och Vitterhets-Samhället i Göteborg Svenska Forskningsrådet Formas |
format |
Article in Journal/Newspaper |
author |
Eichner, Meri Wolf‐Gladrow, Dieter Ploug, Helle |
spellingShingle |
Eichner, Meri Wolf‐Gladrow, Dieter Ploug, Helle Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future p CO 2 levels |
author_facet |
Eichner, Meri Wolf‐Gladrow, Dieter Ploug, Helle |
author_sort |
Eichner, Meri |
title |
Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future p CO 2 levels |
title_short |
Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future p CO 2 levels |
title_full |
Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future p CO 2 levels |
title_fullStr |
Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future p CO 2 levels |
title_full_unstemmed |
Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future p CO 2 levels |
title_sort |
carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future p co 2 levels |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/lno.11986 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11986 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11986 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11986 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Limnology and Oceanography volume 67, issue 1, page 203-218 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1002/lno.11986 |
container_title |
Limnology and Oceanography |
container_volume |
67 |
container_issue |
1 |
container_start_page |
203 |
op_container_end_page |
218 |
_version_ |
1802648572208873472 |