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| Titel |
Marine bivalve shell geochemistry and ultrastructure from modern low pH environments: environmental effect versus experimental bias |
| VerfasserIn |
S. Hahn, R. Rodolfo-Metalpa, E. Griesshaber, W. W. Schmahl, D. Buhl, J. M. Hall-Spencer, C. Baggini, K. T. Fehr, A. Immenhauser |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 5 ; Nr. 9, no. 5 (2012-05-29), S.1897-1914 |
| Datensatznummer |
250007036
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| Publikation (Nr.) |
 copernicus.org/bg-9-1897-2012.pdf |
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| Zusammenfassung |
| Bivalve shells can provide excellent archives of past environmental change
but have not been used to interpret ocean acidification events. We
investigated carbon, oxygen and trace element records from different shell
layers in the mussels Mytilus galloprovincialis combined with detailed investigations of the shell
ultrastructure. Mussels from the harbour of Ischia (Mediterranean, Italy)
were transplanted and grown in water with mean pHT 7.3 and mean
pHT 8.1 near CO2 vents on the east coast of the island. Most
prominently, the shells recorded the shock of transplantation, both in their
shell ultrastructure, textural and geochemical record. Shell calcite,
precipitated subsequently under acidified seawater responded to the pH
gradient by an in part disturbed ultrastructure. Geochemical data from all
test sites show a strong metabolic effect that exceeds the influence of the
low-pH environment. These field experiments showed that care is needed when
interpreting potential ocean acidification signals because various
parameters affect shell chemistry and ultrastructure. Besides metabolic
processes, seawater pH, factors such as salinity, water temperature, food
availability and population density all affect the biogenic carbonate shell
archive. |
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