Since 1990, NI fir trees had a positive growth trend, while SI trees of both species showed a negative trend ( Table S1 available as Supplementary data at Tree Physiology Online).
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Mistletoe-induced carbon, water and nutrient imbalances are imprinted on tree rings.
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The iWUE showed an increasing trend over time in all cases, which was steeper in NI than SI trees of fir and did not differ between infestation classes in pine ( Fig. 4a ).