Reacidification Effects on Water Chemistry and Plankton in a Limed Lake in Sweden

Water chemistry and plankton has been monitored in three Lakes in Tyresta National park SE of Stockholm since 1977. Liming operations started in Lake Långsjön and Lake Trehörningen in 1978 and were repeated every 3-5 years, while Lake Årsjön is an unlimed reference Lake. During 1991-1999, the annual...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2001-08, Vol.130 (1-4), p.1763-1768
Main Authors: Edberg, Frida, Andersson, Paul, Borg, Hans, Ekström, Christina, Hörnström, Einar
Format: Article
Language:English
Subjects:
Acidification
Aluminum
Cadmium
Cladocera
Daphnia longispina
Diaphanosoma brachyurum
Environmental monitoring
Freshwater
Heavy metals
Holopedium gibberum
Lakes
Liming
Manganese
National parks
Organic carbon
pH effects
Phytoplankton
Plankton
Sweden, Aarsjoen L
Sweden, Laangsjoen L
Sweden, Trehoerningen L
Total organic carbon
Water chemistry
Zooplankton
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Summary:Water chemistry and plankton has been monitored in three Lakes in Tyresta National park SE of Stockholm since 1977. Liming operations started in Lake Långsjön and Lake Trehörningen in 1978 and were repeated every 3-5 years, while Lake Årsjön is an unlimed reference Lake. During 1991-1999, the annual pH median in Lake Långsjön and Lake Årsjön ranged between 6.6-7.1 and 5.2-5.8, respectively, and the composition of phyto- and zooplankton in these lakes did not change markedly. After a final treatment in 1991, the liming of Lake Trehörningen was terminated intentionally. As a result, pH decreased from an annual median 7.1 in 1991, to 6.1 in 1999 (5.8 in 1998). Total organic carbon (TOC) did not change markedly during this period, while the levels of calcium decreased. Metals, known to be influenced by acidification, especially cadmium, manganese and aluminium (Al), increased. The labile-inorganic forms of Al also reached higher levels, especially in 1998. Following the decreasing pH, the total number of phytoplankton taxa decreased by ca 40%. Among zooplankton, the cladocerans Holopedium gibberum, Diaphanosoma brachyurum and Daphnia longispina, common during the limed period, became rare.[PUBLICATION ABSTRACT]
ISSN:0049-6979
1573-2932
DOI:10.1023/A:1013964123524