Fig. 4.
Clustering of Δiʹ time series due to co-variability. Δiʹ denotes time series of intramolecular 13C discrimination corrected for triose phosphate cycling (Wieloch et al., 2018). Red: time series discussed here. Data were measured on tree-ring glucose of Pinus nigra laid down from 1961 to 1995 at a dry site in the Vienna basin (n=6 × 31). Members of clusters marked by asterisks are correlated at the following significance levels: ∗P≤0.05; ∗∗ P≤0.01; and ∗∗∗P≤0.001. Precursors of tree-ring glucose, dihydroxyacetone phosphate (DHAP), and glyceraldehyde 3-phosphate (GAP) are shown as molecular structures. Modified figure from Wieloch et al. (2018).