none Nutrition; Diet; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Population dynamics; Habitat; Terrestrial habitat; Land and freshwater zones; Palaearctic region Blepharipa (Tachinidae ); Rogas lymantriae (Braconidae ); Lepidopteran hosts; Lymantria dispar; Natural control at low densities, forest habitat types; Forest; Natural vs plantation, control of lepidopteran host; Japan Exorista japonica; Parasetigena (Tachinidae ); Apanteles liparidis (Braconidae ); Elachertus charondas (Eulophidae ); Lepidopteran hosts; Lymantria dispar; Natural control at low densities; Forest; Natural vs plantation, control of lepidopteran host; Japan; Hokkaido; Natural control of lepidopteran host, forest habitat types Lymantria dispar (Lymantriidae); Dipteran parasites; Blepharipa; Exorista & Parasetigena; Hymenopteran parasites; Apanteles; Elachertus & Rogas; Population regulation; Predators; Aves; Natural population control; Forest; Natural vs plantation, control by parasites & predators; Japan; Hokkaido; Natural control by predators & parasites, forest habitat types Rogas lymantriae (Eulophidae); Japan; Hokkaido; Natural control of lepidopteran host, forest habitat types Aves; Prey; Lymantria dispar (Lepidoptera); Natural control at low densities; Forest; Natural vs plantation; Japan; Hokkaido; Natural control of lepidopteran prey, forest habitat types