Natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five
Bioerosion, resulting from microbioerosion or biogenic dissolution, macrobioerosion and grazing, is one the main processes involved in reef carbonate budget and functioning. On healthy reefs, most of the produced carbonates are preserved and accumulate. But in the context of global change, reefs are...
Published in: | Frontiers in Earth Science |
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Online Access: | http://dx.doi.org/10.3389/feart.2022.894501 https://www.frontiersin.org/articles/10.3389/feart.2022.894501/full |
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crfrontiers:10.3389/feart.2022.894501 2024-02-11T10:07:37+01:00 Natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five Tribollet, Aline Chauvin, Anne Cuet, Pascale 2022 http://dx.doi.org/10.3389/feart.2022.894501 https://www.frontiersin.org/articles/10.3389/feart.2022.894501/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 10 ISSN 2296-6463 General Earth and Planetary Sciences journal-article 2022 crfrontiers https://doi.org/10.3389/feart.2022.894501 2024-01-26T10:06:56Z Bioerosion, resulting from microbioerosion or biogenic dissolution, macrobioerosion and grazing, is one the main processes involved in reef carbonate budget and functioning. On healthy reefs, most of the produced carbonates are preserved and accumulate. But in the context of global change, reefs are increasingly degraded as environmental factors such as ocean warming and acidification affect negatively reef accretion and positively bioerosion processes. The recent 2019 SROCC report suggests that if CO 2 emissions in the atmosphere are not drastically reduced rapidly, 70%–99% of coral reefs will disappear by 2,100. However, to improve projections of coral reef evolution, it is important to better understand dynamics of bioerosion processes. Among those processes, it was shown recently that bioeroding microflora which actively colonize and dissolve experimental coral blocks, release significant amount of alkalinity in seawater both by day and at night under controlled conditions. It was also shown that this alkalinity production is enhanced under ocean acidification conditions (saturation state of aragonite comprised between 2 and 3.5) suggesting that reef carbonate accumulation will be even more limited in the future. To better understand the conditions of production of alkalinity in seawater by boring microflora and its possible consequences on reef resilience, we conducted a series of experiments with natural rubble maintained under natural or artificial light, and various saturation states of aragonite. We show here that biogenic dissolution of natural reef rubble colonized by microboring communities dominated by the chlorophyte Ostreobium sp., and thus the production of alkalinity in seawater, can occur under a large range of saturation states of aragonite, from 2 to 6.4 under daylight and that this production is directly correlated to the photosynthetic activity of microboring communities. We then discuss the possible implications of such paradoxical activities on reef resilience. Article in Journal/Newspaper Ocean acidification Frontiers (Publisher) Frontiers in Earth Science 10 |
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General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Tribollet, Aline Chauvin, Anne Cuet, Pascale Natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five |
topic_facet |
General Earth and Planetary Sciences |
description |
Bioerosion, resulting from microbioerosion or biogenic dissolution, macrobioerosion and grazing, is one the main processes involved in reef carbonate budget and functioning. On healthy reefs, most of the produced carbonates are preserved and accumulate. But in the context of global change, reefs are increasingly degraded as environmental factors such as ocean warming and acidification affect negatively reef accretion and positively bioerosion processes. The recent 2019 SROCC report suggests that if CO 2 emissions in the atmosphere are not drastically reduced rapidly, 70%–99% of coral reefs will disappear by 2,100. However, to improve projections of coral reef evolution, it is important to better understand dynamics of bioerosion processes. Among those processes, it was shown recently that bioeroding microflora which actively colonize and dissolve experimental coral blocks, release significant amount of alkalinity in seawater both by day and at night under controlled conditions. It was also shown that this alkalinity production is enhanced under ocean acidification conditions (saturation state of aragonite comprised between 2 and 3.5) suggesting that reef carbonate accumulation will be even more limited in the future. To better understand the conditions of production of alkalinity in seawater by boring microflora and its possible consequences on reef resilience, we conducted a series of experiments with natural rubble maintained under natural or artificial light, and various saturation states of aragonite. We show here that biogenic dissolution of natural reef rubble colonized by microboring communities dominated by the chlorophyte Ostreobium sp., and thus the production of alkalinity in seawater, can occur under a large range of saturation states of aragonite, from 2 to 6.4 under daylight and that this production is directly correlated to the photosynthetic activity of microboring communities. We then discuss the possible implications of such paradoxical activities on reef resilience. |
format |
Article in Journal/Newspaper |
author |
Tribollet, Aline Chauvin, Anne Cuet, Pascale |
author_facet |
Tribollet, Aline Chauvin, Anne Cuet, Pascale |
author_sort |
Tribollet, Aline |
title |
Natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five |
title_short |
Natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five |
title_full |
Natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five |
title_fullStr |
Natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five |
title_full_unstemmed |
Natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five |
title_sort |
natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/feart.2022.894501 https://www.frontiersin.org/articles/10.3389/feart.2022.894501/full |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Frontiers in Earth Science volume 10 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2022.894501 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
_version_ |
1790606252098715648 |