Ocean acidification does not affect magnesium composition or dolomite formation in living crustose coralline algae, Porolithon onkodes in an experimental system
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Nash, Merinda; Uthicke, S.; Negri, A.P.; Cantin, N.
Description
There are concerns that Mg-calcite crustose coralline algae (CCA), which are key reef builders on coral reefs, will be most susceptible to increased rates of dissolution under higher pCO<inf>2</inf> and ocean acidification. Due to the higher solubility of Mg-calcite, it has been hypothesised that magnesium concentrations in CCA Mg-calcite will decrease as the ocean acidifies, and that this decrease will make their skeletons more chemically stable. In addition to Mg-calcite, CCA Porolithon...[Show more]
dc.contributor.author | Nash, Merinda | |
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dc.contributor.author | Uthicke, S. | |
dc.contributor.author | Negri, A.P. | |
dc.contributor.author | Cantin, N. | |
dc.date.accessioned | 2016-06-14T23:20:13Z | |
dc.identifier.issn | 1726-4170 | |
dc.identifier.uri | http://hdl.handle.net/1885/103262 | |
dc.description.abstract | There are concerns that Mg-calcite crustose coralline algae (CCA), which are key reef builders on coral reefs, will be most susceptible to increased rates of dissolution under higher pCO<inf>2</inf> and ocean acidification. Due to the higher solubility of Mg-calcite, it has been hypothesised that magnesium concentrations in CCA Mg-calcite will decrease as the ocean acidifies, and that this decrease will make their skeletons more chemically stable. In addition to Mg-calcite, CCA Porolithon onkodes, the predominant encrusting species on tropical reefs, can have dolomite (Ca<inf>0.5</inf>Mg<inf>0.5</inf>CO<inf>3</inf>) infilling cell spaces which increases their stability. However, nothing is known about how bio-mineralised dolomite formation responds to higher pCO<inf>2</inf>. Using P. onkodes grown for 3 and 6 months in tank experiments, we aimed to determine (1) if mol % MgCO<inf>3</inf> in new crust and new settlement was affected by increasing CO<inf>2</inf> levels (365, 444, 676 and 904 μatm), (2) whether bio-mineralised dolomite formed within these time frames, and (3) if so, whether this was effected by CO<inf>2</inf>. Our results show that there was no significant effect of CO<inf>2</inf> on mol % MgCO<inf>3</inf> in any sample set, indicating an absence of a plastic response under a wide range of experimental conditions. Dolomite within the CCA cells formed within 3 months and dolomite abundance did not vary significantly with CO<inf>2</inf> treatment. While evidence mounts that climate change will impact many sensitive coral and CCA species, the results from this study indicate that reef-building P. onkodes will continue to form stabilising dolomite infill under near-future acidification conditions, thereby retaining its higher resistance to dissolution. | |
dc.publisher | Copernicus GmbH | |
dc.source | Biogeosciences | |
dc.title | Ocean acidification does not affect magnesium composition or dolomite formation in living crustose coralline algae, Porolithon onkodes in an experimental system | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 12 | |
dc.date.issued | 2015 | |
local.identifier.absfor | 029901 - Biological Physics | |
local.identifier.ariespublication | U3488905xPUB6043 | |
local.type.status | Published Version | |
local.contributor.affiliation | Nash, Merinda, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Uthicke, S., Australian Institute of Marine Science | |
local.contributor.affiliation | Negri, A.P., Australian Institute of Marine Science | |
local.contributor.affiliation | Cantin, N., Australian Institute of Marine Science | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 17 | |
local.bibliographicCitation.startpage | 5247 | |
local.bibliographicCitation.lastpage | 5260 | |
local.identifier.doi | 10.5194/bg-12-5247-2015 | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2016-06-14T08:46:51Z | |
local.identifier.scopusID | 2-s2.0-84941695674 | |
Collections | ANU Research Publications |
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