Untersuchungen zur Eignung von Mytilis edulis als Proxyarchiv.

Heinemann, Agnes (2007) Untersuchungen zur Eignung von Mytilis edulis als Proxyarchiv. (Diploma thesis), Christian-Albrechts-Universität, Kiel, 62, 28 pp.

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Different environmental conditions have measurable impacts on the shells of calcifying marine organisms. The degree of these impacts can be investigated by establishing proxies. Proxies, e. g. elemental ratios and isotopic compositions, serve to construct and improve models of the recent and past climate. In this study, shells of the blue mussel Mytilus edulis, cultivated (1) at different salinities (17, 20, 29, 34 psu) and (2) collected from stations in the Schwentine River, the Kiel Fjord and the North Sea, were analyzed for their suitability as proxy-archives. Mg/Ca and Sr/Ca ratios, two already established proxies, were determined within the calcitic parts of the shells from the cultivation experiments. The ratios were measured using LA-MC-ICP-MS. The lowest ratios were obtained from the 20 psu treatments, where the highest growth rate had occurred. A new proxy, d44/40Ca, was measured with TIMS in the aragonite as well as the calcite of the fieldsampled mussels. Paired analysis of calcite and aragonite in all samples showed a consisten offset, with aragonite featuring 0.15 to 0.31 ‰ lower d44/40Ca values. The highest degree of fractionation between shells and seawater was found in the samples from the Schwentine Delta and the North Sea. ICP-OES measurements of the Sr/Ca and Mg/Ca ratios as well as the d44/40Ca of the extrapallial fluid (EPF) showed values which correspond to more saline seawater and not to the surrounding brackish Schwentine water. The pronounced variability of the elemental ratios of biological replicates as well as the different composition of surrounding water to that of the EPF and of the shell underline a strong biological control and show the complexity of the calcification process. The suitability of Mytilus edulis as a proxy-archive could not be confirmed in the present study and should be subject to further investigation.

Document Type: Thesis (Diploma thesis)
Thesis Advisor: UNSPECIFIED
Keywords: Benthic Ecology; Biogeochemistry; Miesmuschel, Umweltindikator
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: No
Open Access Journal?: Yes
Date Deposited: 03 Nov 2009 13:08
Last Modified: 06 Jul 2012 14:51
URI: http://oceanrep.geomar.de/id/eprint/2014

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