Figure 1: Arctica islandica ∆47 results .
Clumped isotope results are aggregated by specimen or multi-specimen
sample (round symbols; see Table 1 ). Vertical lines represent
95% CL and number indicate sample size. Data is color-coded per
temperature treatment (1°C, 3°C, 15°C and 18°C), with bold error bars
indicating 95% CL. The grey error bar at 6°C highlights A.
islandica data from Bernasconi et al. (2018; recalculated to I-CDES).
Solid and dashed black lines show calibrations by Anderson et al. (2021)
and Meinicke et al. (2020; projected on I-CDES scale; Meinicke et al.,
2021), respectively. Grey solid and dashed lines represent,
respectively, the theoretical calcite (“cc”) and aragonite (“ar”)
temperature dependencies from Guo et al. (2009; projected on the I-CDES
scale, see S1 ). The horizontal axis is scaled to\(\frac{10^{6}}{T^{2}}\), with T in K, to show the assumed linear
relationship with the clumped isotope value.