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Before ocean acidification: calcifier chemistry lessons

Citation

Roleda, M and Boyd, PW and Hurd, CL, Before ocean acidification: calcifier chemistry lessons, Journal of Phycology, 48 pp. 840-843. ISSN 0022-3646 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 Phycological Society of America

DOI: doi:10.1111/j.1529-8817.2012.01195.x

Abstract

Ocean Acidification (OA) has been an important research topic for a decade. Scientists have focused on how the predicted 56% decline in the seawater carbonate ion (CO2 3 ) concentration will dramatically impair the ability of calcifiers, ranging from coccolithophores to shellfish, to form calcium carbonate (CaCO3) structures, and the implications of the reduced carbonate saturation state (X) for increased dissolution of such structures. However, many published OA studies have overlooked a fundamental issue: most calcifying organisms do not rely on carbonate from seawater to calcify; they use either bicarbonate (HCO3 ) or metabolically-produced CO2. The ability of important primary (corals, coralline seaweeds, and coccolithophores) and secondary (mollusks) producers to modify their local carbonate chemistry suggests that the primary threat to them from OA is by dissolution rather than impaired calcification. Here, we draw on calcification research from an era before OA and combine it with recent studies that question the source of the carbonate ion, to provide new insights into how OA might affect calcifying organisms. Organismal modification of local carbonate chemistry may enable some calcifiers to successfully form calcareous structures despite OA. Key index words: calcification; carbonate chemistry; carbonic anhydrase; coccolithophores; coralline macroalgae; corals; invertebrate; molluscs; ocean acidification; physiological chemistry Abbreviations: X, carbonate saturation state; CA, carbonic anhydrase; CaCO3, calcium carbonate; CO2 3 , carbonate; CO2, carbon dioxide; DIC, dissolved inorganic carbon; H+, hydrogen ion; HCO3 ), bicarbonate; OA, ocean acidification

Item Details

Item Type:Refereed Article
Keywords:ocean acidification, calcification, algae, corals, molluscs
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Ecological Impacts of Climate Change
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Ecosystem Adaptation to Climate Change
Author:Boyd, PW (Professor Philip Boyd)
Author:Hurd, CL (Associate Professor Catriona Hurd)
ID Code:91462
Year Published:2012
Web of Science® Times Cited:44
Deposited By:IMAS Research and Education Centre
Deposited On:2014-05-20
Last Modified:2014-06-10
Downloads:0

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