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Marine calcifiers exhibit mixed responses to CO (sub 2) -induced ocean acidification

Justin B. Ries, Anne L. Cohen and Daniel C. McCorkle
Marine calcifiers exhibit mixed responses to CO (sub 2) -induced ocean acidification
Geology (Boulder) (December 2009) 37 (12): 1131-1134


Anthropogenic elevation of atmospheric carbon dioxide (pCO (sub 2) ) is making the oceans more acidic, thereby reducing their degree of saturation with respect to calcium carbonate (CaCO (sub 3) ). There is mounting concern over the impact that future CO (sub 2) -induced reductions in the CaCO (sub 3) saturation state of seawater will have on marine organisms that construct their shells and skeletons from this mineral. Here, we present the results of 60 d laboratory experiments in which we investigated the effects of CO (sub 2) -induced ocean acidification on calcification in 18 benthic marine organisms. Species were selected to span a broad taxonomic range (crustacea, cnidaria, echinoidea, rhodophyta, chlorophyta, gastropoda, bivalvia, annelida) and included organisms producing aragonite, low-Mg calcite, and high-Mg calcite forms of CaCO (sub 3) . We show that 10 of the 18 species studied exhibited reduced rates of net calcification and, in some cases, net dissolution under elevated pCO (sub 2) . However, in seven species, net calcification increased under the intermediate and/or highest levels of pCO (sub 2) , and one species showed no response at all. These varied responses may reflect differences amongst organisms in their ability to regulate pH at the site of calcification, in the extent to which their outer shell layer is protected by an organic covering, in the solubility of their shell or skeletal mineral, and in the extent to which they utilize photosynthesis. Whatever the specific mechanism(s) involved, our results suggest that the impact of elevated atmospheric pCO (sub 2) on marine calcification is more varied than previously thought.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 37
Serial Issue: 12
Title: Marine calcifiers exhibit mixed responses to CO (sub 2) -induced ocean acidification
Affiliation: Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA, United States
Pages: 1131-1134
Published: 200912
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 26
Accession Number: 2010-007907
Categories: Environmental geologyInvertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2009279
Illustration Description: illus. incl. 1 table
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201005
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