Water, Air, and Soil Pollution

, Volume 85, Issue 2, pp 647–652 | Cite as

Acidification in Norway — Status and trends biological monitoring — Improvements in the invertebrate fauna

  • G. G. Raddum
  • A. Fjellheim
Part III Long Term Trends in Acidification

Abstract

The Norwegian monitoring programme of acidification include studies of invertebrates, which started in 1981. The invertebrate programme is based on kick samples from a fixed station net in 8 river systems. The stations include tributaries as well as stations in the main river. This paper deals with three rivers located in a gradient covering the range of acidic deposition in West Norway. The invertebrates are identified to species level and sorted with respect to acid sensitive and acid tolerant species, used for stating an acidification index. The spring samples generally show the highest acidification due to release of acids during snow smelt. In fall the acidity was lower and the index was less variable. A significant increase in the acidification index (reduced acidity) was recorded during fall in the period 1989 – 94 in two of the watersheds. In the third watershed no significant trend was recorded. During the years 1982 – 1988 a significant increase in the index occurred in spring in the watershed with lowest acidic deposition. The increases observed in the index is probably a result of the reductions in acid deposition in Norway.

Key words

Rivers Acidification Monitoring Benthic invertebrates Recovery 
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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • G. G. Raddum
    • 1
  • A. Fjellheim
    • 1
  1. 1.Institute of ZoologyUniversity of BergenBergenNorway

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