Conophagous and seminiphagous insects of Norway spruce Picea abies (L.) Karst. in the Babia Gòra National Park and its surroundings1

Abstract

AbstractDuring the period from 1991 to 1993 3521 insect specimens representing 12 species were obtained from 629 Norway spruce cones. This material originated from the Babia Góra National Park 50 km southwest of Kraków and its surroundings. The coenotic groups of conophages, seminiphages and parasitoids were distinguished. For each group the index of dominance (D), stability of incidence (C), species diversity (d), and Agrell's index of species co‐existence were calculated. Seed losses caused by insects were estimated on the basis of the analyses of 46 118 seeds.