Ocean acidification enhances the growth rate of larger diatoms

Wu, Y; Campbell, DA; Irwin, AJ; Suggett, DJ; Finkel, ZV

Ocean acidification enhances the growth rate of larger diatoms

Wu, Y Campbell, DA Irwin, AJ Suggett, DJ

Finkel, ZV

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Publication Type:: Journal Article
Citation:: Limnology and Oceanography, 2014, 59 (3), pp. 1027 - 1034
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Wu, Y	en_US
dc.contributor.author	Campbell, DA	en_US
dc.contributor.author	Irwin, AJ	en_US
dc.contributor.author	Suggett, DJ https://orcid.org/0000-0001-5326-2520	en_US
dc.contributor.author	Finkel, ZV	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Limnology and Oceanography, 2014, 59 (3), pp. 1027 - 1034	en_US
dc.identifier.issn	0024-3590	en_US
dc.identifier.uri	http://hdl.handle.net/10453/115389
dc.description.abstract	Ocean acidification is changing the nature of inorganic carbon availability in the global oceans. Diatoms account for ~ 40% of all marine primary productivity and are major contributors to the export of atmospheric carbon to the deep ocean. Larger diatoms are more likely to be stimulated by future increases in CO2 availability as a result of their low surface area to volume ratio and lower diffusive flux of CO2 relative to their carbon demand for growth. Here we quantify the effect of the partial pressure of carbon dioxide ((PCO2), at levels of 190, 380, and 750 μL L-1, on the growth rate, photosystem II electron transport rate (ETR), and elemental composition for five diatom species ranging over five orders of magnitude in cell volume. Growth rates for all species were enhanced under 750 relative to 190 and 380 μL L-1, with little change in ETR or elemental stoichiometries, indicating an enhanced allocation of photochemical energy to growth under elevated PCO2. PCO2 enhancement of growth rates was size dependent. Under 750 vs. 190 μL L-1 partial pressures, growth rate was enhanced by ~ 5% for the smaller diatom species to ∼ 30% for the largest species examined. The size dependence of CO2-stimulated growth enhancement indicates that ocean acidification may selectively favor an increase in the growth rates of larger vs. smaller phytoplankton species in the sea, with potentially significant consequences for carbon biochemistry. © 2014, by the Association for the Sciences of Limnology and Oceanography, Inc.	en_US
dc.relation.ispartof	Limnology and Oceanography	en_US
dc.relation.isbasedon	10.4319/lo.2014.59.3.1027	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Ocean acidification enhances the growth rate of larger diatoms	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	59	en_US
utslib.for	060705 Plant Physiology	en_US
utslib.for	060701 Phycology (incl. Marine Grasses)	en_US
utslib.for	04 Earth Sciences	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	59	en_US

Abstract:

Ocean acidification is changing the nature of inorganic carbon availability in the global oceans. Diatoms account for ~ 40% of all marine primary productivity and are major contributors to the export of atmospheric carbon to the deep ocean. Larger diatoms are more likely to be stimulated by future increases in CO2 availability as a result of their low surface area to volume ratio and lower diffusive flux of CO2 relative to their carbon demand for growth. Here we quantify the effect of the partial pressure of carbon dioxide ((PCO2), at levels of 190, 380, and 750 μL L-1, on the growth rate, photosystem II electron transport rate (ETR), and elemental composition for five diatom species ranging over five orders of magnitude in cell volume. Growth rates for all species were enhanced under 750 relative to 190 and 380 μL L-1, with little change in ETR or elemental stoichiometries, indicating an enhanced allocation of photochemical energy to growth under elevated PCO2. PCO2 enhancement of growth rates was size dependent. Under 750 vs. 190 μL L-1 partial pressures, growth rate was enhanced by ~ 5% for the smaller diatom species to ∼ 30% for the largest species examined. The size dependence of CO2-stimulated growth enhancement indicates that ocean acidification may selectively favor an increase in the growth rates of larger vs. smaller phytoplankton species in the sea, with potentially significant consequences for carbon biochemistry. © 2014, by the Association for the Sciences of Limnology and Oceanography, Inc.

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http://hdl.handle.net/10453/115389