Marine bivalve shell geochemistry and ultrastructure from modern low pH environments: environmental effect versus experimental bias

Hahn, S., Rodolfo-Metalpa, R., Griesshaber, E., Schmahl, W. W., Buhl, D., Hall-Spencer, J. M., Baggini, C., Fehr, K. T. and Immenhauser, A. (2012) Marine bivalve shell geochemistry and ultrastructure from modern low pH environments: environmental effect versus experimental bias Biogeosciences (BG), 9 (5). pp. 1897-1914. DOI 10.5194/bg-9-1897-2012.

[img]
Preview
Text
bg-9-1897-2012.pdf - Published Version

Download (7Mb) | Preview

Supplementary data:

Abstract

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.

Document Type: Article
Additional Information: WOS:000305829800011
Keywords: EOCENE THERMAL MAXIMUM; MUSSEL MYTILUS-EDULIS; CARBON ISOTOPIC COMPOSITION; OCEAN ACIDIFICATION; SEAWATER ACIDIFICATION; CALCIUM-CARBONATE; STABLE-ISOTOPE; CORAL-REEFS; BIOLOGICAL-CONTROLS; ACIDIFIED SEAWATER
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-9-1897-2012
ISSN: 1726-4170
Projects: BIOACID
Date Deposited: 06 Nov 2012 14:03
Last Modified: 06 Nov 2012 14:03
URI: http://oceanrep.geomar.de/id/eprint/19112

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...