Diversity of Hymenoptera in the Forest Area with Special Purpose (KHDTK) Aek Nauli, North Sumatra

As one of the four largest insect orders, Hymenoptera are important pollinators, parasitoids, and predators in the agricultural sector. The objective of this research was to study the diversity and abundance of hymenoptera in the Forest Area with Special Purpose/KHDTK Aek Nauli, Simalungun Regency, North Sumatra, Indonesia. The insect sampling was conducted during the day and night using yellow and light trap technique. The results obtained a total of 13 species of Hymenoptera consisting of 45 ind. The relative abundance was recorded from 2.22 to 22.22 with the highest abundance from Vespula sp (Vespidae) and Sceliphron curvatum (Spechidae). The highest Importance Value Index (IVI) of Hymenoptera species was documented from Brachymyrmex sp. (Formicidae) at 115.56 and Polybia fastidiosuscula (Vespidae) at 106.67. The Shannon’s diversity (H’) of Hymenoptera ranged between 0.89 and 1.83 among sites or categorized as low-to-medium level of biodiversity with an evenness index (E) from 0.64 to 1.00. This finding may be noted as our first attempt in documenting the beta diversity of insects in the forest region.