Entomofauna szyszek i nasion świerka pospolitego Plcea Abies (l.) Karst. w wybranych drzewostanach Gorczańskiego parku narodowego Część I. charakterystyka grup cenotycznych
AbstractA field study on the insects infesting seeds and cones of Picea abies (L.) Karst. was carried out in 1998-2000 in the Gorce National Park in southern Poland. The aim of this study was: to evaluate qualitatively and quantitatively the insects in spruce cones in the selected localities in the Park; to distinguish coenotic groups of the insects; to assess the impact of these insects species on seed production. A total of 3600 cones were collected from 180 trees growing at 30 sites located at different altitudes (from 700 to 1200 m above sea level) (Fig. 1). Of these samples, 900 cones containing 242,043 seeds were analysed. From these seeds 54,000 were selected at random and anali%ed by cutting, in order to calculate the percentage of viable seeds as well as of the infertile ones and those destroyed by insect larvae (Tab. 1). The remaining cones were designated for mass rearing in glass jars. This study yielded 17 803 specimens of 34 species of insects from 5 orders (Fig. 2, Tab. 2). Trophic groups were distin¬guished, which were characteri%ed with use of ecological indicators: permanency, domintation and species diversity (Fig. 3, Tab. 3). Lepidoptera appeared to be the most numerous order (7,880 specimens), and the most abundantly occurring species was Cydia strobilella L. with 7,700 individuals, which represented 43% of the total number of obtained insects. On the basis of the index of permanency of presence (C), the following species were the most characteristic for the examined groups: Cydia strobilella L., Megastigmus strobilobius Rat%., Phaedroctonus transfuga Grav. and Torymus azureus Boh. The group of parasitoids was most diverse in respect of species composition. The entomofauna of mature cones characteri%ed more species differentiation in trophic groups than the entomofauna of maturing cones. The greatest seed losses, ca. 5% of the total number of seeds, were caused by Cydia strobilella L. Megastigmus strobilobius Rat%. and Plemeliella abietina Seitn. damaged less than 1% of the total number of seeds (Fig. 4).
|Other language title versions||Cone- and seed entomofauna of Norway spruce Picea abies (L.) Karst. In the selected stands of the Gorce National Park. Part I. Characterizat1on of the coenot1c groups|
|Journal series||Acta Agraria et Silvestria series Silvestris, ISSN 0065-0927, (B 1 pkt)|
|Publication size in sheets||1.25|
|Keywords in Polish||Picea abies, Gorce, szyszki, owady, grupy cenotyczne, straty w nasionach|
|Keywords in English||Picea abies, Gorce Mts., cones, insects, coenotic groups, seed losses|
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