Benthic buffers and boosters of ocean acidification on coral reefs
Ocean acidification is a threat to marine ecosystems globally. In shallow-water systems, however, ocean acidification can be masked by benthic carbon fluxes, depending on community composition, seawater residence time, and the magnitude and balance of net community production (NCP) and calcification...
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ftdoajarticles:oai:doaj.org/article:d037cbe47e7e4a76a48ebe01204c7187 2023-05-15T17:50:19+02:00 Benthic buffers and boosters of ocean acidification on coral reefs K. R. N. Anthony G. Diaz-Pulido N. Verlinden B. Tilbrook A. J. Andersson 2013-07-01T00:00:00Z https://doi.org/10.5194/bg-10-4897-2013 https://doaj.org/article/d037cbe47e7e4a76a48ebe01204c7187 EN eng Copernicus Publications http://www.biogeosciences.net/10/4897/2013/bg-10-4897-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-4897-2013 1726-4170 1726-4189 https://doaj.org/article/d037cbe47e7e4a76a48ebe01204c7187 Biogeosciences, Vol 10, Iss 7, Pp 4897-4909 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-4897-2013 2022-12-31T16:25:11Z Ocean acidification is a threat to marine ecosystems globally. In shallow-water systems, however, ocean acidification can be masked by benthic carbon fluxes, depending on community composition, seawater residence time, and the magnitude and balance of net community production (NCP) and calcification (NCC). Here, we examine how six benthic groups from a coral reef environment on Heron Reef (Great Barrier Reef, Australia) contribute to changes in the seawater aragonite saturation state (Ω a ). Results of flume studies using intact reef habitats (1.2 m by 0.4 m), showed a hierarchy of responses across groups, depending on CO 2 level, time of day and water flow. At low CO 2 (350–450 μatm), macroalgae ( Chnoospora implexa ), turfs and sand elevated Ω a of the flume water by around 0.10 to 1.20 h −1 – normalised to contributions from 1 m 2 of benthos to a 1 m deep water column. The rate of Ω a increase in these groups was doubled under acidification (560–700 μatm) and high flow (35 compared to 8 cm s −1 ). In contrast, branching corals ( Acropora aspera ) increased Ω a by 0.25 h −1 at ambient CO 2 (350–450 μatm) during the day, but reduced Ω a under acidification and high flow. Nighttime changes in Ω a by corals were highly negative (0.6–0.8 h −1 ) and exacerbated by acidification. Calcifying macroalgae ( Halimeda spp.) raised Ω a by day (by around 0.13 h −1 ), but lowered Ω a by a similar or higher amount at night. Analyses of carbon flux contributions from benthic communities with four different compositions to the reef water carbon chemistry across Heron Reef flat and lagoon indicated that the net lowering of Ω a by coral-dominated areas can to some extent be countered by long water-residence times in neighbouring areas dominated by turfs, macroalgae and carbonate sand. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Biogeosciences 10 7 4897 4909 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 K. R. N. Anthony G. Diaz-Pulido N. Verlinden B. Tilbrook A. J. Andersson Benthic buffers and boosters of ocean acidification on coral reefs |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Ocean acidification is a threat to marine ecosystems globally. In shallow-water systems, however, ocean acidification can be masked by benthic carbon fluxes, depending on community composition, seawater residence time, and the magnitude and balance of net community production (NCP) and calcification (NCC). Here, we examine how six benthic groups from a coral reef environment on Heron Reef (Great Barrier Reef, Australia) contribute to changes in the seawater aragonite saturation state (Ω a ). Results of flume studies using intact reef habitats (1.2 m by 0.4 m), showed a hierarchy of responses across groups, depending on CO 2 level, time of day and water flow. At low CO 2 (350–450 μatm), macroalgae ( Chnoospora implexa ), turfs and sand elevated Ω a of the flume water by around 0.10 to 1.20 h −1 – normalised to contributions from 1 m 2 of benthos to a 1 m deep water column. The rate of Ω a increase in these groups was doubled under acidification (560–700 μatm) and high flow (35 compared to 8 cm s −1 ). In contrast, branching corals ( Acropora aspera ) increased Ω a by 0.25 h −1 at ambient CO 2 (350–450 μatm) during the day, but reduced Ω a under acidification and high flow. Nighttime changes in Ω a by corals were highly negative (0.6–0.8 h −1 ) and exacerbated by acidification. Calcifying macroalgae ( Halimeda spp.) raised Ω a by day (by around 0.13 h −1 ), but lowered Ω a by a similar or higher amount at night. Analyses of carbon flux contributions from benthic communities with four different compositions to the reef water carbon chemistry across Heron Reef flat and lagoon indicated that the net lowering of Ω a by coral-dominated areas can to some extent be countered by long water-residence times in neighbouring areas dominated by turfs, macroalgae and carbonate sand. |
format |
Article in Journal/Newspaper |
author |
K. R. N. Anthony G. Diaz-Pulido N. Verlinden B. Tilbrook A. J. Andersson |
author_facet |
K. R. N. Anthony G. Diaz-Pulido N. Verlinden B. Tilbrook A. J. Andersson |
author_sort |
K. R. N. Anthony |
title |
Benthic buffers and boosters of ocean acidification on coral reefs |
title_short |
Benthic buffers and boosters of ocean acidification on coral reefs |
title_full |
Benthic buffers and boosters of ocean acidification on coral reefs |
title_fullStr |
Benthic buffers and boosters of ocean acidification on coral reefs |
title_full_unstemmed |
Benthic buffers and boosters of ocean acidification on coral reefs |
title_sort |
benthic buffers and boosters of ocean acidification on coral reefs |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-4897-2013 https://doaj.org/article/d037cbe47e7e4a76a48ebe01204c7187 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Biogeosciences, Vol 10, Iss 7, Pp 4897-4909 (2013) |
op_relation |
http://www.biogeosciences.net/10/4897/2013/bg-10-4897-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-4897-2013 1726-4170 1726-4189 https://doaj.org/article/d037cbe47e7e4a76a48ebe01204c7187 |
op_doi |
https://doi.org/10.5194/bg-10-4897-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
7 |
container_start_page |
4897 |
op_container_end_page |
4909 |
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1766157026578137088 |