Dynamic CO2 and pH levels in coastal, estuarine, and inland waters: Theoretical and observed effects on harmful algal blooms.

Raven, JA; Gobler, CJ; Hansen, PJ

Dynamic CO2 and pH levels in coastal, estuarine, and inland waters: Theoretical and observed effects on harmful algal blooms.

Raven, JA Gobler, CJ Hansen, PJ

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Harmful algae, 2020, 91
Issue Date:: 2020-01

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Field	Value	Language
dc.contributor.author	Raven, JA
dc.contributor.author	Gobler, CJ
dc.contributor.author	Hansen, PJ
dc.date.accessioned	2020-11-20T01:09:56Z
dc.date.available	2019-03-08
dc.date.available	2020-11-20T01:09:56Z
dc.date.issued	2020-01
dc.identifier.citation	Harmful algae, 2020, 91
dc.identifier.issn	1568-9883
dc.identifier.issn	1878-1470
dc.identifier.uri	http://hdl.handle.net/10453/144172
dc.description.abstract	Rising concentrations of atmospheric CO2 results in higher equilibrium concentrations of dissolved CO2 in natural waters, with corresponding increases in hydrogen ion and bicarbonate concentrations and decreases in hydroxyl ion and carbonate concentrations. Superimposed on these climate change effects is the dynamic nature of carbon cycling in coastal zones, which can lead to seasonal and diel changes in pH and CO2 concentrations that can exceed changes expected for open ocean ecosystems by the end of the century. Among harmful algae, i.e. some species and/or strains of Cyanobacteria, Dinophyceae, Prymnesiophyceae, Bacillariophyceae, and Ulvophyceae, the occurrence of a CO2 concentrating mechanisms (CCMs) is the most frequent mechanism of inorganic carbon acquisition in natural waters in equilibrium with the present atmosphere (400 μmol CO2 mol-1 total gas), with varying phenotypic modification of the CCM. No data on CCMs are available for Raphidophyceae or the brown tide Pelagophyceae. Several HAB species and/or strains respond to increased CO2 concentrations with increases in growth rate and/or cellular toxin content, however, others are unaffected. Beyond the effects of altered C concentrations and speciation on HABs, changes in pH in natural waters are likely to have profound effects on algal physiology. This review outlines the implications of changes in inorganic cycling for HABs in coastal zones, and reviews the knowns and unknowns with regard to how HABs can be expected to ocean acidification. We further point to the large regions of uncertainty with regard to this evolving field.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier BV
dc.relation.ispartof	Harmful algae
dc.relation.isbasedon	10.1016/j.hal.2019.03.012
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	05 Environmental Sciences, 06 Biological Sciences
dc.subject.classification	Marine Biology & Hydrobiology
dc.subject.mesh	Carbon Dioxide
dc.subject.mesh	Ecosystem
dc.subject.mesh	Seawater
dc.subject.mesh	Hydrogen-Ion Concentration
dc.subject.mesh	Harmful Algal Bloom
dc.subject.mesh	Carbon Dioxide
dc.subject.mesh	Ecosystem
dc.subject.mesh	Seawater
dc.subject.mesh	Hydrogen-Ion Concentration
dc.subject.mesh	Harmful Algal Bloom
dc.subject.mesh	Carbon Dioxide
dc.subject.mesh	Ecosystem
dc.subject.mesh	Harmful Algal Bloom
dc.subject.mesh	Hydrogen-Ion Concentration
dc.subject.mesh	Seawater
dc.title	Dynamic CO2 and pH levels in coastal, estuarine, and inland waters: Theoretical and observed effects on harmful algal blooms.
dc.type	Journal Article
utslib.citation.volume	91
utslib.location.activity	Netherlands
utslib.for	05 Environmental Sciences
utslib.for	06 Biological Sciences
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2020-11-20T01:09:49Z
pubs.publication-status	Published
pubs.volume	91

Abstract:

Rising concentrations of atmospheric CO2 results in higher equilibrium concentrations of dissolved CO2 in natural waters, with corresponding increases in hydrogen ion and bicarbonate concentrations and decreases in hydroxyl ion and carbonate concentrations. Superimposed on these climate change effects is the dynamic nature of carbon cycling in coastal zones, which can lead to seasonal and diel changes in pH and CO2 concentrations that can exceed changes expected for open ocean ecosystems by the end of the century. Among harmful algae, i.e. some species and/or strains of Cyanobacteria, Dinophyceae, Prymnesiophyceae, Bacillariophyceae, and Ulvophyceae, the occurrence of a CO2 concentrating mechanisms (CCMs) is the most frequent mechanism of inorganic carbon acquisition in natural waters in equilibrium with the present atmosphere (400 μmol CO2 mol-1 total gas), with varying phenotypic modification of the CCM. No data on CCMs are available for Raphidophyceae or the brown tide Pelagophyceae. Several HAB species and/or strains respond to increased CO2 concentrations with increases in growth rate and/or cellular toxin content, however, others are unaffected. Beyond the effects of altered C concentrations and speciation on HABs, changes in pH in natural waters are likely to have profound effects on algal physiology. This review outlines the implications of changes in inorganic cycling for HABs in coastal zones, and reviews the knowns and unknowns with regard to how HABs can be expected to ocean acidification. We further point to the large regions of uncertainty with regard to this evolving field.

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http://hdl.handle.net/10453/144172