NATURE OBSERVATIONS LIESJÄRVI
Dragonfly and butterfly observations near a summer cottage since 2003
Peräjärvi is surrounded by agricultural landscape, which might have affected its water quality (relatively high EC, 96 uS).
So far, it is the only lake with a large population of S. vulgatum. In 2016, 76 of the 94 collected excuviae belonged to S. vulgatum.