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Acidification diminishes diatom silica production in the Southern Ocean


Petrou, K and Baker, KG and Nielsen, DA and Hancock, AM and Schultz, KG and Davidson, AT, Acidification diminishes diatom silica production in the Southern Ocean, Nature Climate Change, 9, (10) pp. 781-786. ISSN 1758-678X (2019) [Refereed Article]

Copyright Statement

Copyright 2019 The Authors, under exclusive licence to Springer Nature Limited

DOI: doi:10.1038/s41558-019-0557-y


Diatoms, large bloom-forming marine microorganisms, build frustules out of silicate, which ballasts the cells and aids their export to the deep ocean. This unique physiology forges an important link between the marine silicon and carbon cycles. However, the effect of ocean acidification on the silicification of diatoms is unclear. Here we show that diatom silicification strongly diminishes with increased acidity in a natural Antarctic community. Analyses of single cells from within the community reveal that the effect of reduced pH on silicification differs among taxa, with several species having significantly reduced silica incorporation at CO2 levels equivalent to those projected for 2100. These findings suggest that, before the end of this century, ocean acidification may influence the carbon and silicon cycle by both altering the composition of the diatom assemblages and reducing cell ballasting, which will probably alter vertical flux of these elements to the deep ocean.

Item Details

Item Type:Refereed Article
Keywords:ocean acidification, phytoplankton, diatoms, silica, Antarctica
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine biodiversity
UTAS Author:Hancock, AM (Miss Alyce Hancock)
UTAS Author:Davidson, AT (Dr Andrew Davidson)
ID Code:137593
Year Published:2019
Web of Science® Times Cited:34
Deposited By:Oceans and Cryosphere
Deposited On:2020-02-20
Last Modified:2020-05-26

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