Showing papers in "Annales Zoologici in 1975"

Aphid-aphidophage community in Alfalfa cultures (Medicago sativa L.) in Poland. Pt. 1, Structure and phenology of the community

Abstract: Aphid-aphidophage community was studied in four regions of Poland. The sweep -net technique and catch per unit time provide a representative picture of the species composi­ tion if a series of 15-25 samples is used. In addition to Асуrthosiphon pisum ( H a r r i s ) , five groups of consumers are included to the community. Within two food chains, oligophagous predators and parasites, 126 species were recorded. A new concept of the aphid-aphidophage community structure has been developed. Among the dominant species there were 6 Coccinellidae, 7 Syrphidae and 3 Ghrysopidae. On each site the community is enriched in local, accessory species. Among the parasites a high stability of occurrence was observed for the ApMdiidae. Charipidae and Geraphronidae. The species composition of the Aphelinidae is not stable. The number dynamics of aphids has two peaks : in the spring-summer period and in the autumn, The appearance of aphidophages is significantly correlated with the first peak. ,, 3