EN
Numbers and domination structure of insects and spiders Aranei are presented. Research was carried out in Lednicki Landscape Park in Western Poland. To collect the material, Moericke traps were set up. Drop in the number of insects, together with decreasing diversity of plants and increased isolation of stands is shown. The value of the number of insects was proved to be twice as small on the islands of Lednica lake compared to the mainland. Among insects, Diptera was the dominating one, which makes 64,6% of the collected material. Spidres, being 3% of the collected material were — contrary to insects — much more numerous on the islands, both natural and environmental ones.