Protoplasma

, Volume 247, Issue 1–2, pp 25–43 | Cite as

Tree-stem diameter fluctuates with the lunar tides and perhaps with geomagnetic activity

  • Peter W. Barlow
  • Miroslav MikuleckýSr
  • Jaroslav Střeštík
Original Article

Abstract

Our initial objective has been to examine the suggestion of Zürcher et al. (Nature 392:665–666, 1998) that the naturally occurring variations in stem diameter of two experimental trees of Picea alba were related to near-simultaneous variations in the lunisolar tidal acceleration. The relationship was positive: Lunar peaks were roughly synchronous with stem diameter peaks. To extend the investigation of this putative relationship, additional data on stem diameter variations from six other tree species were gathered from published literature. Sixteen sets of data were analysed retrospectively using graphical representations as well as cosinor analysis, statistical cross-correlation and cross-spectral analysis, together with estimated values of the lunisolar tidal acceleration corresponding to the sites, dates and times of collection of the biological data. Positive relationships were revealed between the daily variations of stem diameter and the variations of the lunisolar tidal acceleration. Although this relationship could be mediated by a 24.8-h lunar rhythm, the presence of a solar rhythm of 24.0 h could not be ruled out. Studies of transpiration in two of the observed trees indicated that although this variable was not linked to stem diameter variation, it might also be subject to lunisolar gravitational regulation. In three cases, the geomagnetic Thule index showed a weak but reciprocal relationship with stem diameter variation, as well as a positive relationship with the lunisolar tidal force. In conclusion, it seems that lunar gravity alone could influence stem diameter variation and that, under certain circumstances, additional regulation may come from the geomagnetic flux.

Keywords

Abies alba Juglans regia Lunisolar tidal acceleration Picea abies Pseudotsuga menziesii Stem diameter variation Thule index Tilia cordata Transpiration Trees 

Abbreviations

CD

Coefficient of determination

δD

Stem diameter variation

δg

Lunisolar tidal acceleration (vertical component)

Th

Thule index

Ts

Rate of transpiration

Notes

Acknowledgement

Thanks are due to two anonymous referees for their constructive commentaries. In addition, Professors Gerhard Dorda (Munich) and Ernst Zürcher (Biel) kindly provided supportive remarks and also useful information in the form of reprints and preprints of their own publications and those of others. Professor D.T. Clarkson and Dr S. Barlow are also thanked for their patient reading and commentary upon early drafts of this work. Mr Timothy Colborn expertly prepared the diagrams.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Peter W. Barlow
    • 1
  • Miroslav MikuleckýSr
    • 2
    • 3
  • Jaroslav Střeštík
    • 4
  1. 1.School of Biological SciencesUniversity of BristolBristolUK
  2. 2.Department of Biometrics and Statistics, Neuroendocrinology Letters, Stockholm and Bratislava, Sweden and SlovakiaUniversity of MinnesotaMinneapolisUSA
  3. 3.BioCosUniversity of MinnesotaMinneapolisUSA
  4. 4.Institute of GeophysicsAcademy of Sciences of Czech RepublicPragueCzech Republic

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