Aquatic Sciences

, Volume 59, Issue 4, pp 362–375

The separation of the influence of nutrients and climate on the varve time-series of baldeggersee, Switzerland

  • A. F. Lotter
  • H. J. B. Birks

DOI: 10.1007/BF02522364

Cite this article as:
Lotter, A.F. & Birks, H.J.B. Aquatic Science (1997) 59: 362. doi:10.1007/BF02522364


The varve data-set from a freeze-core taken in the deepest part of Baldeggersee was subjected to different multivariate statistical analyses in order to estimate the amount of variance in the varve thickness measures explicable by past climate and by the trophic state of the lake. A comparison of two different time-periods (1902 to1992 versus 1920 to 1980) revealed that the lake restoration programme since 1982 has had a significant impact on the formation of the seasonal layers. Results of the partitioning of the variance in the varve thickness measures showed that about two thirds of the variance are unexplained by a climate and trophic state model and that trophic state explains 6%, whereas climate accounts for about 28% of the variance before the effect of lake restoration had a strong impact on the varves. Among the climate parameters the amount of annual precipitation is a strong predictor for explaining the thickness of both dark layer and total couplet thickness, whereas summer precipitation is important for the thickness of the light layer.

Key words

Variance partitioning redundancy analysis multiple linear regression eutrophication varves 

Copyright information

© Birkhäuser Verlag 1997

Authors and Affiliations

  • A. F. Lotter
    • 1
    • 2
  • H. J. B. Birks
    • 3
    • 4
  1. 1.Geobotanical InstituteUniversity of BernBernSwitzerland
  2. 2.Swiss Federal Institute for Environmental Science and Technology (EAWAG)DübendorfSwitzerland
  3. 3.Botanical InstituteUniversity of BergenBergenNorway
  4. 4.Environmental Change Research Centre, Dept. of GeographyUniversity College LondonLondonUK