Ocean acidification
Bred oysters switch shell carbon under acidification
Open access · cc by · source: Europe PMC
Selectively bred Saccostrea glomerata keep more ordered calcite and can use different DIC pathways than wild-type oysters in acidified Australian estuaries.
Key findings
Acidified seawater was isotopically lighter. Wild-type shells showed more crystallographic disorder. Under acidification shell δ13C went negative, consistent with a switch from HCO3− toward CO32− as the carbon source; selected families already used the CO32−-like signature at control sites.
Methodology
Families bred for QX resistance or fast growth plus wild-type oysters were sampled from control (~pH 8.1–8.2) and acidified (~pH 7.4–7.5) leases; shells were mapped by EBSD and δ13C was measured in seawater, shell, tissue, and extrapallial fluid.
Limitations
Small n (12 oysters, 3 per SEM/isotope analysis) and covarying salinity, temperature, and food mean acidification is not isolated; commercial breeding is not a reef-restoration trial.
How this study connects
Role on claims
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Selectively bred Saccostrea glomerata keep more ordered calcite and can use different DIC pathways than wild-type oysters in acidified Australian estuaries.
Evidence for the claim as stated.
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