Biologie der Interaktion zwischen Koleopteren und agaricoiden Basidiomyzeten

Lorenz Henneberg, Biologie
The aim of this study was to analyze mechanisms and ecological relationships between Coleoptera and basidiocarps of agarics. Therefore, field experiments as well as laboratory experiments were conducted in basidiocarps of Megacollybia platyphylla and Marasmius alliaceus served as model systems. Basidiocarps of both mushrooms were picked up in three consecutive years in two different natural forest preserve reservations and in one economic forest area incidentally. Due to their ephemerality,
more » ... r ephemerality, their rapid transience, and their discontinuous temporal and spatial occurrence, basidiocarps of agarics are regarded as exceptionally unstable microhabitats. Therefore, the agaricoid basidiocarps seem to be inapt for the development of specialized and specific associations with insects. The present field studies, however, revealed that the fructification of Megacollybia is characterized by broad temporal and spatial pattern of occurrence. Marasmius alliaceus resembles this type of fructification. These results suggest that in contrast to other agaricoid mushrooms, basidiocarps of Megacollybia platyphylla and Marasmius alliaceus may serve as appropriate habitat resources for insects. This assumption was supported by colonization data. In particular the two mycophagous staphylinids Gyrophaena joyioides and G. gentilis showed high dominance and continuity values at Megacollybia platyphylla and Marasmius alliaceus basidiocarps indicating specificity to these species. Moreover, the present study revealed that basidiocarps of these two species serve as aggregation centers, mating arenas, food source, for oviposition, and as refuge for larval development. Furthermore, the study uncovered that both G. joyioides and G. gentilis have an extremely shortened larval developmental period though using different breeding strategies. These breeding strategies are interpreted as specific adaptations to the ephemeral microhabitats. Laboratory experiments established another adaptation mechanism of insects to their specific habitat niche. Observ [...]
doi:10.17192/z2004.0269 fatcat:nbjp4psmkfeexo23wq32gcto2i