Spragšių (Coleoptera: Elateridae) gausumo tyrimai skirtingose agroekosistemose

Abstract

During the study at 4 different agroecosystems types 237 click beetle were caught, 10 species of click beetle which belong to 6 genera were recognized. Among 10 identified click beetle species 4 (Agriotes lineatus L., Argiotes obscurus L., Hemicrepidius hirtus Hbst. and Oedostethus quadripustulatus F.) were recognized as common and were detected without exception in all pit fall traps agroecosystems. Adults of Oedostethus quadripustulatus F. were the most abundant in the study (85 specimens or 35.86 %). It was found that essentially the highest number of click beetle adult specimens has been determined in natural meadow and essentially the smallest amount of click beetles was detected in intensively cultivated land. Studying the seasonal dynamics of click beetle richness two peaks were set: in June and July. Making an evaluation of the study a tendency emphasised that species abundance mostly depends on agroecosystems intensity. From the data obtained the conclusion can be made, that the number of click beetle increased with the change in the intensity of tillage in comparison to the fields where the farming activity is most intensive with the perennial grass meadow, where the anthropogenic activity is minimal.