Description:
<p>The flora and fauna of the acidified Lake Gårdsjön have been qualitatively and quantitatively described. The ecosystem showed many differences when compared with non-acidified oligotrophic lakes. There were, for instance, fewer planktonic species, fewer fragmentators and other grazers in the littoral zone, the Sphagnum mat had expanded to cover large parts of the bottom area. There has been a change on the top predator level, from fish to macroinvertebrate predators, insects in particular. It is evident that the described alterations of the biotic system have a multi-causal background with both abiotic and biotic components.</p>