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A review and meta-analysis of potential impacts of ocean acidification on marine alcifiers from the Southern Ocean

Citation

Figuerola, B and Hancock, AM and Bax, N and Cummings, VJ and Downey, R and Griffiths, HJ and Smith, J and Stark, JS, A review and meta-analysis of potential impacts of ocean acidification on marine alcifiers from the Southern Ocean, Frontiers in Marine Science, 8 Article 584445. ISSN 2296-7745 (2021) [Refereed Article]


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DOI: doi:10.3389/fmars.2021.584445

Abstract

Understanding the vulnerability of marine calcifiers to ocean acidification is a critical issue, especially in the Southern Ocean (SO), which is likely to be the one of the first, and most severely affected regions. Since the industrial revolution, ~30% of anthropogenic CO2 has been absorbed by the global oceans. Average surface seawater pH levels have already decreased by 0.1 and are projected to decline by ~0.3 by the year 2100. This process, known as ocean acidification (OA), is shallowing the saturation horizon, which is the depth below which calcium carbonate (CaCO3) dissolves, likely increasing the vulnerability of many resident marine calcifiers to dissolution. The negative impact of OA may be seen first in species depositing more soluble CaCO3 mineral phases such as aragonite and high-Mg calcite (HMC). Ocean warming could further exacerbate the effects of OA in these particular species. Here we combine a review and a quantitative meta-analysis to provide an overview of the current state of knowledge about skeletal mineralogy of major taxonomic groups of SO marine calcifiers and to make projections about how OA might affect a broad range of SO taxa. We consider a species' geographic range, skeletal mineralogy, biological traits, and potential strategies to overcome OA. The meta-analysis of studies investigating the effects of the OA on a range of biological responses such as shell state, development and growth rate illustrates that the response variation is largely dependent on mineralogical composition. Species-specific responses due to mineralogical composition indicate that taxa with calcitic, aragonitic, and HMC skeletons, could be at greater risk to expected future carbonate chemistry alterations, and low-Mg calcite (LMC) species could be mostly resilient to these changes. Environmental and biological control on the calcification process and/or Mg content in calcite, biological traits, and physiological processes are also expected to influence species-specific responses.

Item Details

Item Type:Refereed Article
Keywords:ocean acidification, review, meta-analysis, calcifiers, carbonate mineralogy, magnesium, aragonite, climate change, vulnerability, Antarctica, saturation horizon
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Assessment and management of Antarctic and Southern Ocean ecosystems
UTAS Author:Hancock, AM (Miss Alyce Hancock)
UTAS Author:Bax, N (Ms Narissa Bax)
ID Code:142937
Year Published:2021
Deposited By:Ecology and Biodiversity
Deposited On:2021-02-17
Last Modified:2021-02-17
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