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ADALBERT BALOG, VIKTOR MARKÓ, PÉTER SZARVAS. Dominance, Activity Density and Prey Preferences of Rove Beetles (Coleoptera: Staphylinidae) in Conventionally Treated Hungarian Agro-Ecosystems. BULLETIN OF ENTOMOLOGICAL RESEARCH (in press). , 2008.

Abstract: Field experiments were conducted to investigate the mechanism underlying patterns of rove beetles population in apple and pear orchards (1998 to 2002) and winter wheat (2006 to 2007) following treatment with broad-spectrum insecticide in Hungary. The capacity of predatory staphylinid species to feed on cereal pests was measured in the laboratory at room temperature, with 6 species tested in petri dishes. Almost 23% of the Hungarian and 13% of the European staphylinid fauna are represented in the investigated agro-ecosystems. In orchards 5,236 individuals were collected belonging to 253 species. The most widely occurring were: Omalium caesum Gravenhorst, Drusilla canaliculata (F.), Dinaraea angustula (Gyllenhal), Palporus nitidulus (F.), Xantholinus. longiventris (Olivier), X. linearis (Olivier) and Aleochara bipustulata (L.). In winter wheat 798 individuals and 20 species were collected, the most frequent were: Staphylinus caesareus Cederh, Tachyporus hypnorum (F.), Philonthus cognatus (Stephens), Aloconota gregaria (Erichson), Tachyporus chrysomelinus (L.) and T. obtusus (L.). Species composition differed by crop (apple, pear and wheat), soil composition and surroundings habitat. Species diversity was also influenced by these parameters. In wheat one acute change in species composition was observed and the decline of Tachyporus spp., which occurred equally across all farms. The consumption rate of prey by the dominant species occurred in wheat ecosystems was relatively high, however we did not offer any fungal food to compare with insects prey.

Keywords: hedgerows, orchards, soil structure, surrounding habitat, wheat.


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