Hasselrot, B., B.I. Andersson & H. Hultberg. (1984). Ecosystem shifts and reintroduction of Arctic char (Salvelinus salvelinus (L.)) after liming of a strongly acidified lake in Southwestern Sweden. Reports of the Institute of Freshwater Research, Drottningholm. 61:78-92.

510942

Hasselrot, B., B.I. Andersson & H. Hultberg

1984

61:78-92.

Publication

http://hdl.handle.net/2077/48736

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Before undergoing lime treatment in December 1979 Lake Stora Holmevatten was a strongly acidified oligotrophic lake. Much of the biota including all fish species, had disappeared during the acid period. The indigenous Arctic char population which became extinct, had represented a unique genetic stock, classifying this lake with high national interest. After lime treatment, pH and alkalinity were observed to increase substantially, and the high aluminium levels (500 [tg'l-1) decreased to less than 100 jtg-1“1. Biomass levels of phytoplankton, zooplankton and benthic organisms increased within one to three years, following liming. Diversity of zooplankton and benthic fauna increased but the diversity of phytoplankton did not change significantly. In contrast to earlier studies, chironomid biomass increased following liming, suggesting that aluminium toxicity may have affected the larvae during the acidified period. The generally increased biomasses and shifts in phytoplankton and zooplankton species indicate that a higher net-production was one important effect of liming. The introduced Arctic char preyed on a variety of food items, one of which, the introduced Asellus aquaticHS, was of growing importance. The growth rate of the introduced Arctic char was higher than that of the previous, now extinct population. Occurrence of two-summer-old char in test catches in November 1982 showed that natural spawning was successful already by autumn 1980.

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