Emergence of Trichoptera in 1972-74 from two streams near Lunz (Austria)

Abstract Quantitative results of the Trichoptera emergence, obtained by the greenhouse method, in two mountain streams in southwestern Lower Austria in 1972-74 are presented and discussed. The total biomass of emerging insects lies between 20 and 30 Kcal/m2 • a, as in other previously investigated streams. The Trichoptera emergence is between 8.4 and 10.0 Kcal/m2 • a for both streams, which however show considerable differences in temperature and structure of the biocoenoses