Nematode assemblages from the moss Hypnum cupressiforme Hedw. growing on different substrates in a balkanic durmast oak forest (Quercus dalechampii Ten.) on Mount Vitosha, Bulgaria

Species and generic composition, trophic structure and some ecological para meters of nematode assemblages from the moss, Hypnum cupressiforme Hedw, in a durmast oak (Quercus dalechampii Ten.) forest were studied on three subs trates (soil, stone and tree trunks). Nematode abundance was very variable between samples and substrates. Nematode assemblages varied in species comp osition but were similar in generic composition, diversity and trophic grou p structure. Bacterial feeders were the most abundant, frequent and diverse trophic group, while the proportion of omnivorous and predatory nematodes was remarkably low, i.e., the nematode assemblages present can be character ised as of the 'detritus foodweb' type. No clear substrate-dependent patter ns in the distribution of single species were found, with the exception of Chiloplectus andrassyi which was typical and abundant for mosses growing on stones.