Hoverfly (Syrphidae) Communities Respond to Varying Structural Retention After Harvesting in Canadian Peatland Black Spruce Forests

摘要: Variable retention harvesting (VRH), in which trees are removed at variable intensity and spatial configuration across the landscape, retains greater forest structural heterogeneity than traditional clear-cut is being recommended as an alternative for sustainable management of boreal forest. Little known about its effects on fauna; thus, we studied influence one type VRH (harvesting with advanced regeneration [HARP]) Syrphidae (Diptera) community northern Ontario forests peatland black spruce (Picea mariana). We examined varying (from unharvested through partial to clear-cut) syrphid species richness abundance, abundance functional assemblages. Greater population abundances were found generally harvested forests. Overall four (Platycheirus rosarum, Toxomerus marginatus, Xylota annulifera, X. tuberculata) larval predators all higher both sites those sites. Similarly, overall nine Species responses discussed ecological context. Differences among levels relatively minor compared area, suggesting that local habitat characteristics may play a more important role determining landscape configuration. However, level effect was evident, syrphids be useful reflecting changes stand structure scale.