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Tree stem diameters fluctuate with tide


The diameter of tree stems growing under open and controlled conditions undergoes rhythmic fluctuations independent of daily periodic factors such as light, temperature and humidity. We find a strong correlation between these fluctuations and the timing and strength of tides. This correlation suggests that the Moon is influencing the flow of water between different parts of the trees.

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Figure 1: Reversible diameter variations in spruce and gravimetric tides.


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Zürcher, E., Cantiani, MG., Sorbetti-Guerri, F. et al. Tree stem diameters fluctuate with tide. Nature 392, 665–666 (1998).

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