Przemiany w zespołach larw Diptera w rekultywowanej glebie w Krakowie-Zakrzówku

Abstract

The structure of Diptera larvae groups living in a re-cultivated meadow in Kraków-Zakrzówek was studied between the years 1995-1998. An increase in abundance and diversity, as confirmed by Shannon index (0,64-0,93), indicates that the transformation of group structure is a directional process. The trophic structure of the group also showed directional alterations. In all research periods, saprophagous dipterous larvae were the dominant groups and their abundance increased from 50% to almost 72%. The contribution of predaceous Dolichopodidae, Empididae, Rhagionidae, Asilidae and Tabanidae to the total number of dipterous larvae was not regular and varied greatly (from 1% to 29%). The phytosaprophagous larvae of Limnobiidae, Bibionidae, Tipulidae and Ceratopogonidae were also very numerous, but their abundance fell in successive years from 48% to 16%. The changes in total biomass during the research period showed a tendency to balance the participation of all trophic groups.