Predicting the long‐term acidification trends in small subarctic lakes using diatoms

Predicting the long‐term acidification trends in small subarctic lakes using diatoms Summary 1. A considerable proportion of the total deposition of sulphur in northernmost Europe originates from the large non‐ferrous smelters of the Kola Peninsula, Russia. Potential long‐term effects of this point source pollution on sensitive subarctic lakes were evaluated using palaeolimnological techniques. 2. Multivariate analysis of a diatom and water chemistry data set from 45 small headwater lakes located in north‐eastern Finnish Lapland demonstrated that pH, calcium and silica were the three most powerful chemical variables in explaining the variance in the diatom data. From these, lake water pH was shown to be the strongest determinator by variance partitioning. 3. Weighted averaging partial least squares regression (WA‐PLS) was used to develop a diatom‐based prediction model for inferring lake water pH from sediment core diatom assemblages. The performance of the model was assessed by leave‐one‐out cross‐validation. 4. The prediction model was applied to radiometrically dated sediment cores taken from three headwater lakes receiving different amounts of acid fallout from the Kola Peninsula smelter industry. 5. Stable diatom assemblages and results of pH reconstructions suggested that no substantial changes in the acidification status of the lakes have occurred within the last century despite the very high local acid deposition. 6. The pollution levels in the study area have not increased to the point where the biology of the lakes has been influenced significantly. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ecology Wiley

Predicting the long‐term acidification trends in small subarctic lakes using diatoms

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Publisher
Wiley
Copyright
Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0021-8901
eISSN
1365-2664
D.O.I.
10.1046/j.1365-2664.1999.00461.x
Publisher site
See Article on Publisher Site

Abstract

Summary 1. A considerable proportion of the total deposition of sulphur in northernmost Europe originates from the large non‐ferrous smelters of the Kola Peninsula, Russia. Potential long‐term effects of this point source pollution on sensitive subarctic lakes were evaluated using palaeolimnological techniques. 2. Multivariate analysis of a diatom and water chemistry data set from 45 small headwater lakes located in north‐eastern Finnish Lapland demonstrated that pH, calcium and silica were the three most powerful chemical variables in explaining the variance in the diatom data. From these, lake water pH was shown to be the strongest determinator by variance partitioning. 3. Weighted averaging partial least squares regression (WA‐PLS) was used to develop a diatom‐based prediction model for inferring lake water pH from sediment core diatom assemblages. The performance of the model was assessed by leave‐one‐out cross‐validation. 4. The prediction model was applied to radiometrically dated sediment cores taken from three headwater lakes receiving different amounts of acid fallout from the Kola Peninsula smelter industry. 5. Stable diatom assemblages and results of pH reconstructions suggested that no substantial changes in the acidification status of the lakes have occurred within the last century despite the very high local acid deposition. 6. The pollution levels in the study area have not increased to the point where the biology of the lakes has been influenced significantly.

Journal

Journal of Applied EcologyWiley

Published: Dec 1, 1999

References

  • Numerical tools in palaeolimnology – progress, potentialities, and problems
    Birks, Birks
  • Diatoms and pH reconstruction
    Birks, Birks; Line, Line; Juggins, Juggins; Stevenson, Stevenson; Ter Braak, Ter Braak
  • Partialling out the spatial component of ecological variation
    Borcard, Borcard; Legendre, Legendre; Drapeau, Drapeau
  • Holocene development and early extreme acidification in a small hilltop lake in southern Finland
    Korhola, Korhola; Tikkanen, Tikkanen
  • Modern diatom, cladocera, chironomid, and chrysophyte cyst assemblages as quantitative indicators for the reconstruction of past environmental conditions in the Alps. I. Climate
    Lotter, Lotter; Birks, Birks; Hofmann, Hofmann; Marchetto, Marchetto
  • Carbonaceous particle record in lake sediments from the Arctic and other remote areas of the northern hemisphere
    Rose, Rose
  • Diatoms as quantitative indicators of pH and water temperature in subarctic Fennoscandian lakes
    Weckström, Weckström; Korhola, Korhola; Blom, Blom

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