Spatial distribution of Trichoptera larvae in the sediments of an Austrian mountain brook

摘要: SUMMARY 1. A set of thirty-six permanently installed standpipc traps was used over 2 years to sample caddis larvae at various depths in the gravel bed an Austrian brook. From a total 805 specimens caught, most abundant species were Sericostoma sp. (Sericostomatidae), and three limnephilids Potamophylax cingulatus Steph., Allgamus auricollisPictet Allogamus uncatus Brauer. 2. Ecclisopteryx guttulata Pictet collected down seditnent depth l m. In sp., burrowing species, tiny found sediments 20–60 em, where life cycle is spent; fully grown mostly 0–20 em. All instars cingulatus, auricollis sediment surface. 3. The horizontal distribution studied 20 cm stratum. Larvae midstream areas. 4. Factors probably responsible for observed spatial pattern are briefly diseussed.