Water, Air, and Soil Pollution

, Volume 7, Issue 3, pp 295–305 | Cite as

Macrophyte succession in Swedish lakes caused by deposition of airborne acid substances

  • Olle Grahn


Recurrent biological investigations have been made in six lakes in two areas in western Sweden. It has been found that the supply of acid substances induces long-term biological perturbations at all trophic levels in the lake ecosystem. Among these changes, the Sphagnum expansion is believed to strongly affect the dynamics in the lake. A quantification of the Sphagnum expansion in different depth zones of a lake was made. The rate of this invasion was found to be highest in shaded and sheltered areas of the littoral. The abundance of Sphagnum mats is furthermore negatively correlated to the pH of the lake water.

The further consequences for the lake ecosystem of this occupation of ever-larger bottom areas by dense Sphagnum mats are discussed.


Macrophyte Lake Water Trophic Level Lake Ecosystem Acid Substance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Company 1977

Authors and Affiliations

  • Olle Grahn
    • 1
  1. 1.Swedish Water and Air Pollution Research LaboratoryGothenburgSweden

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