Experimental determination of strontium and magnesium partitioning in calcite of the freshwater ostracod Herpetocypris intermedia

摘要: Cultures of the freshwater ostracod Herpetocypris intermedia (Crustacea) were kept under controlled conditions in order to study influence chemistry and temperature water, as well calcification process, on incorporation strontium magnesium their calcite carapaces. These experiments pointed out three factors that induced variations partition coefficients D(Sr) D(Mg): (1) process: light-weight shells usually depleted Sr content when compared calcified valves; (2) a high water Sr/Ca ratio: this case an increase with Mg was observed; (3) Mg/Ca above ratio similar 1, D(Mg) nearly constant (0.0042 +/- 0.0007). In low ratios (<0.4), increased. Our results also show does not value for Herpetocypris. We hypothesise taxa such have developed mechanisms control effect content, because they do exert during avoid high-Mg formation.