Acta Scientiarum Polonorum
Silvarum Colendarum Ratio et Industria Lignaria

Research was conducted in the Giant Mountains within the highest region of the Sudeten. In the period of 2014–2015 a total of 3590 larvae and imagines representing 62 species of Trichoptera were caught from 20 location sites of 8 streams flowing in the Karkonosze National Park (KNP). Some species were new for the Giant Mountains and one of them – Hydropsyche tenuis Navas, 1932, was a novel form within the fauna of Poland. There was a substantial group of typical species for mountain and highland regions. In the collected material relatively few species require higher pH values as opposed to species with higher tolerance to acidifi- cation of water. The obtained results are comparable with the results for the Babia Góra, as well as with those obtained for the Czech part of the Giant Mountains. The species composition and the relatively low density of Trichoptera larvae living in the studied streams testify to the specificity of the waters in the KNP.