Journal of Paleolimnology

, Volume 18, Issue 4, pp 395–420

Modern diatom, cladocera, chironomid, and chrysophyte cyst assemblages as quantitative indicators for the reconstruction of past environmental conditions in the Alps. I. Climate

  • André F. Lotter
  • H. John B. Birks
  • Wolfgang Hofmann
  • Aldo Marchetto
Article

DOI: 10.1023/A:1007982008956

Cite this article as:
Lotter, A.F., Birks, H.J.B., Hofmann, W. et al. Journal of Paleolimnology (1997) 18: 395. doi:10.1023/A:1007982008956

Abstract

Diatom, chrysophyte cyst, benthic cladocera, planktonic cladocera, and chironomid assemblages were studied in the surface sediments of 68 small lakes along an altitudinal gradient from 300 to 2350 m in Switzerland. In addition, 43 environmental variables relating to the physical limnology, geography, catchment characteristics, climate, and water chemistry were recorded or measured for each lake. The explanatory power of each of these predictor variables for the different biological data-sets was estimated by a series of canonical correspondence analyses (CCA) and the statistical significance of each model was assessed by Monte Carlo permutation tests. A minimal set of environmental variables was found for each biological data-set by a forward-selection procedure within CCA. The unique, independent explanatory power of each set of environmental variables was estimated by a series of CCAs and partial CCAs. Inference models or transfer functions for mean summer (June, July, August) air temperature were developed for each biological data-set using weighted-averaging partial least squares or partial least squares. The final transfer functions, after data screening, have root mean squared errors of prediction, as assessed by leave-one-out cross-validation, of 1.37 °C (chironomids), 1.60 °C (benthic cladocera), 1.62 °C (diatoms), 1.77 °C (planktonic cladocera), and 2.23 °C (chrysophyte cysts).

transfer functions weighted-averagingpartial-least-squares summer temperatures surfacesediments modern training-sets Switzerland 

Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • André F. Lotter
    • 1
    • 2
  • H. John B. Birks
    • 3
    • 4
  • Wolfgang Hofmann
    • 5
  • Aldo Marchetto
    • 6
  1. 1.Geobotanical InstituteUniversity of BernBernSwitzerland
  2. 2.Swiss Federal Institute of Environmental Science and Technology (EAWAG)DübendorfSwitzerland
  3. 3.Botanical InstituteUniversity of BergenBergenNorway
  4. 4.Environmental Change Research CentreUniversity College LondonLondonUK
  5. 5.Max-Planck-Institut für LimnologiePlönGermany
  6. 6.Consiglio Nazionale delle RicercheIstituto Italiano di IdrobiologiaVerbania PallanzaItaly

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