Inter- and intra-specimen variability masks reliable temperature control on shell Mg/Ca ratios in laboratory- and field-cultured <i>Mytilus edulis</i> and <i>Pecten maximus</i> (bivalvia)
2008; Copernicus Publications; Volume: 5; Issue: 5 Linguagem: Inglês
10.5194/bg-5-1245-2008
ISSN1726-4189
AutoresP. S. Freitas, Leon J. Clarke, Hilary Kennedy, Christopher A. Richardson,
Tópico(s)Marine Biology and Ecology Research
ResumoAbstract. The Mg/Ca ratios of biogenic calcite is commonly seen as a valuable palaeo-proxy for reconstructing past ocean temperatures. The temperature dependence of Mg/Ca ratios in bivalve calcite has been the subject of contradictory observations. The palaeoceanographic use of a geochemical proxy is dependent on initial, rigorous calibration and validation of relationships between the proxy and the ambient environmental variable to be reconstructed. Shell Mg/Ca ratio data are reported for the calcite of two bivalve species, Mytilus edulis (common mussel) and Pecten maximus (king scallop), which were grown in laboratory culturing experiments at controlled and constant aquarium seawater temperatures over a range from ~10 to ~20°C. Furthermore, Mg/Ca ratio data of laboratory- and field-grown M. edulis specimens were compared. Only a weak, albeit significant, shell Mg/Ca ratio–temperature relationship was observed in the two bivalve species: M. edulis (r2=0.37, p
Referência(s)