Effects of elevated pCO2 on dissolution of coral carbonates by microbial euendoliths
Identifieur interne : 000235 ( Main/Exploration ); précédent : 000234; suivant : 000236Effects of elevated pCO2 on dissolution of coral carbonates by microbial euendoliths
Auteurs : A. Tribollet [France, États-Unis] ; C. Godinot ; M. Atkinson [États-Unis] ; C. Langdon [États-Unis]Source :
- Global Biogeochemical Cycles [ 0886-6236 ] ; 2009-09.
English descriptors
- Teeft :
- Ambient pco2, Bioeroded, Bioeroded surface area, Bioerosion, Biogenic dissolution, Bulk density, Caco3, Carbonate, Carbonate dissolution, Carbonate dissolution rate, Carbonate dissolution rates, Chazottes, Chlorophyte, Chlorophyte ostreobium quekettii, Coral, Coral reefs, Coral skeleton, Coral skeleton density, Coral skeletons, Coralline, Coralline algae, Crustose, Crustose coralline algae, Dissolution, Endolithic, Epilithic, Euendolithic, Euendolithic communities, Euendolithic filaments, Euendoliths, Experimental blocks, Filament, Filament abundance, French polynesia, Global biogeochem, Golubic, Grazers, Kaneohe, Langdon, Lateral sides, Lobata, Marine biology, Mastigocoleus testarum, Microdensity, Oceanic, Oceanic blocks, Oceanic site, Ostreobium, Pco2, Pco2 treatments, Ppmv, Quekettii, Relative abundance, Seawater, Skeleton, Surface area, Surface area bioeroded, Tribollet, Upper side.
Abstract
Eight‐month‐old blocks of the coral Porites lobata colonized by natural Hawaiian euendolithic and epilithic communities were experimentally exposed to two different aqueous pCO2 treatments, 400 ppmv and 750 ppmv, for 3 months. The chlorophyte Ostreobium quekettii dominated communities at the start and at the end of the experiment (65–90%). There were no significant differences in the relative abundance of euendolithic species, nor were there any differences in bioeroded area at the surface of blocks (27%) between pCO2 treatments. The depth of penetration of filaments of O. quekettii was, however, significantly higher under 750 ppmv (1.4 mm) than under 400 ppmv (1 mm). Consequently, rates of carbonate dissolution measured under elevated pCO2 were 48% higher than under ambient pCO2 (0.46 kg CaCO3 dissolved m−2 a−1 versus 0.31 kg m−2 a−1). Thus, biogenic dissolution of carbonates by euendoliths in coral reefs may be a dominant mechanism of carbonate dissolution in a more acidic ocean.
Url:
DOI: 10.1029/2008GB003286
Affiliations:
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The chlorophyte Ostreobium quekettii dominated communities at the start and at the end of the experiment (65–90%). There were no significant differences in the relative abundance of euendolithic species, nor were there any differences in bioeroded area at the surface of blocks (27%) between pCO2 treatments. The depth of penetration of filaments of O. quekettii was, however, significantly higher under 750 ppmv (1.4 mm) than under 400 ppmv (1 mm). Consequently, rates of carbonate dissolution measured under elevated pCO2 were 48% higher than under ambient pCO2 (0.46 kg CaCO3 dissolved m−2 a−1 versus 0.31 kg m−2 a−1). Thus, biogenic dissolution of carbonates by euendoliths in coral reefs may be a dominant mechanism of carbonate dissolution in a more acidic ocean.</div></front></TEI><affiliations><list><country><li>France</li><li>États-Unis</li></country><region><li>Arizona</li><li>État de New York</li></region></list><tree><noCountry><name sortKey="Godinot, C" sort="Godinot, C" uniqKey="Godinot C" first="C." last="Godinot">C. Godinot</name></noCountry><country name="France"><noRegion><name sortKey="Tribollet, A" sort="Tribollet, A" uniqKey="Tribollet A" first="A." last="Tribollet">A. Tribollet</name></noRegion><name sortKey="Tribollet, A" sort="Tribollet, A" uniqKey="Tribollet A" first="A." last="Tribollet">A. Tribollet</name></country><country name="États-Unis"><region name="Arizona"><name sortKey="Tribollet, A" sort="Tribollet, A" uniqKey="Tribollet A" first="A." last="Tribollet">A. 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