Psocid taxocenoses structure and diversity (INSECTA: PSOCOPTERA) in the forest ecosystems of the piceeti-fageta S. Lat. Zone in the western carpathian mts.

Psocid taxocenoses (Psocoptera) were studied in forest ecosystems of the Western Carpathian Mts. during 1997-2001. As a study frame,vegetation tiers (= altitudinal vegetation zones) were used. Lower units of forest typological system (forest type complexes) were used for a classification of ecological conditions as well. Only a part of material,i.e. individuals that was found in the forest ecosystems of Piceeti-fageta s. lat. communities (= the 6 th spruce-beech vegetation tier) was evaluated for purpose of this work. This vegetation tier is widespread in higher parts of mountains (the Moravskoslezské Beskydy Mts. and partly in the Oravské Beskydy Mts.). 554 adults comprising 17 species were found in total in the 6 th vegetation tier. As eudominant species,the following ones were found: Caecilius despaxi,Caecilius burmeisteri,Mesopsocus unipunctatus,and Stenopsocus lachlani; as dominant species,the following ones were found: Caecilius flavidus and Reuterella helvimacula. In natural geobiocenoses with the level of naturalness of 1 or 2,the following species were found: as eudominant species: Mesopsocus unipunctatus,Stenopsocus lachlani,Caecilius despaxi,Amphigerontia bifasciata and Reuterella helvimacula. Dominant species was Caecilius burmeisteri and Caecilius flavidus. Taxocenoses of psocids were evaluated by Detrended Correspondence analysis (DCA) and Divisive Cluster analysis (DvClA). This material was compared to another material gained from various vegetation tiers in the Western Carpathians Mts. The characteristic species composition of psocids in the 6,h vegetation tier was as follows - Cecilius despaxi - Stenopsocus lachlani - Mesopsocus unipunctatus - Reuterella helvimacula.