Challenges in assessing biological recovery from acidification in Swedish lakesReport as inadecuate

Challenges in assessing biological recovery from acidification in Swedish lakes - Download this document for free, or read online. Document in PDF available to download.


, Volume 43, Supplement 1, pp 19–29

First Online: 15 November 2014


Since the 1980s, Swedish lakes have in general become less acidified. Assessment of biological recovery is, however, hampered by poor pre-acidification data, confounding effects of climate change, and few lakes with annual sampling of fish and other organisms. Only three critically acidified, but non-limed, lakes had two decades of fish monitoring. The lakes had not yet recovered to pre-industrial chemical targets. Fish had low species richness compared to other organism groups. Roach Rutilus rutilus and-or European perch Perca fluviatilis were the dominant fish species, and the acid-sensitive roach had been lost from one of the lakes. Calcium decreased, possibly approaching pre-acidification concentrations, but exceeded minimum levels needed to sustain some Daphnia species. High or increasing levels of total organic carbon, likely due to reduced acidification and climate change, might influence the biological communities in unexpected ways, for example, facilitating more frequent occurrence of the invasive algae Gonyostomum semen.

KeywordsAcidification Lakes Time series Biological recovery Dominant species Electronic supplementary materialThe online version of this article doi:10.1007-s13280-014-0559-y contains supplementary material, which is available to authorized users.

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Author: Kerstin Holmgren


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