engleski

The characteristics of the populations of five Agriotes (Coleoptera, Elateridae) species in three regions in Croatia

Introduction: The literature data reported that the most abundant species in eastern regions of Croatia are A.ustulatus and A.sputator. A.lineatus together with A.obscurus were reported as the most abundant species in western regions. A.brevis was not mentioned. Our investigations indicated the changes in the distribution and abundance of these species. Methods: The abundance of the five species was examined on sex pheromone traps (Csalomon) in 15 fields (corn, soybean, barley and alfalfa) located in three different regions in Croatia in 2007. Pheromones were operated from April to September, checked weakly and changed every 6 weeks. Results: The total number of collected beetles varied between 181 and 1482 per field. No significant differences between the total numbers of adults among different crops were registered. The average number of collected adults per field per region varied between 419 and 868 without any significant difference among the regions. The most abundant species in all regions was A.ustulatus with dominance index between 52 and 80%. A.lineatus had significantly higher dominance index in the west region (28.72%) while A.obscurus had significantly higher dominance index in east region than in other 2 regions. The abundances of A.brevis and A sputator were between 1.42 and 13.08% depending on the species and region without significant differences. Conclusions: The most dangerous species A.ustulatus has been spread toward west and is eudominant species in all regions. A.lineatus is eudominant in the west region but A.obscurus is eudominant in east region and these species do not appear together

abundance; Agriotes brevis; A. lineatus; A. sputator; A. obscurus; A. ustulatus; Elateridae; distribution

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