The common brackish water ostracods Cyprideis torosa and Loxoconcha elliptica frequently occur together in high abundances in marginal marine environments. Seasonality of calcification differs between species and can have important implications for palaeotemperature reconstructions. There are existing palaeotemperature calibrations for both genera. However, the Loxoconcha spp. Mg/Ca temperature calibration has not thus far been applied to L. elliptica. The equation for Loxoconcha spp. does not rely on a known Mg/Ca_water value, unlike the calibration for C. torosa, suggesting it may be possible to reconstruct temperatures without an estimation of Mg/Ca_water, which is potentially particularly beneficial in environments that have highly dynamic Mg/Ca_water. However, the calibration has only been applied in environments with marine-like Mg/Ca_water. Demonstrating the applicability of the equation in marginal marine environments (with Mg/Ca_water 3–5 mol/mol) and tracking the seasonal calcification of L. elliptica alongside C. torosa, therefore, has the potential to improve uncertainty in seasonal palaeotemperature reconstructions. Here, we compare previous monitoring of C. torosa with L. elliptica from the same collections. We demonstrate that the Mg/Ca temperature calibration for Loxoconcha spp. is appropriate to use with L. elliptica. Mg/Ca-inferred temperatures broadly track spring temperatures and suggest spring calcification. Cyprideis torosa Mg/Ca-inferred temperatures record the range of expected temperatures between spring and autumn. When analysing multiple single valves of L. elliptica and C. torosa simultaneously, the maximum Mg/Ca_C.torosa can, therefore, be used to reconstruct maximum summer temperatures, the minimum Mg/Ca_C.torosa to reconstruct autumn temperatures, and the Mg/Ca_L.elliptica to reconstruct the range in spring temperatures.

常见的咸水介形类Cyprideis torosa和Loxoconcha elliptica经常大量同时出现在边缘海洋环境中。钙化的季节性因物种而异，对古气温重建具有重要意义。这两个属都有现有的古温度校准。然而，Loxoconcha spp。迄今为止，Mg/Ca 温度校准尚未应用于L. elliptica。Loxoconcha spp的方程。与C. torosa的校准不同，不依赖于已知的 Mg/Ca_水值，表明无需估计 Mg/Ca_水即可重建温度，这在具有高度动态 Mg/Ca_水的环境中可能特别有益。然而，该校准仅适用于具有类似海洋镁/钙_水的环境。因此，证明方程在边缘海洋环境（Mg/Ca_{水为 3-5 mol/mol）中的适用性并跟踪}L. elliptica和C. torosa的季节性钙化，有可能改善季节性古气温重建的不确定性。在这里，我们比较了之前对C. torosa和L. elliptica的监测来自相同的集合。我们证明了Loxoconcha spp的 Mg/Ca 温度校准。适合与L. elliptica一起使用。镁/钙推断温度大致跟踪春季温度并表明春季钙化。Cyprideis torosa镁/钙推断温度记录了春季和秋季之间的预期温度范围。因此，当同时分析L. elliptica和C. torosa的多个单瓣膜时，最大 Mg/Ca _C.torosa可用于重建夏季最高温度，最小 Mg/Ca _C.torosa可用于重建秋季温度，_椭圆形镁/钙重建春季温度范围。