Species diversity of hover flies (Diptera: Syrphidae) and determination of the dominant species in Garmsar region

Hover flies (Diptera: Syrphidae) are considered as one of the most important natural enemies of aphids, and one of the most useful pollinators of plants. Their larvae are predators of aphids and they have an important role in ensuring biological balance. In this study, which were performed in Garmsār region in 2010, these flies were collected and identified. The species diversity of these insects was measured by indexes of Shanon–Winer (H´), Brilloun (Ĥ), and Margalov (Dmg). In the faunistic studies, 16 species belonging to 10 genera and 2 sub-families, were identified, among them the species, Eupeodes lapponicus, is considered as the new record form Iran. The maximum diversity and abundance of hover flies in Garmsār were as Ĥ=1.125, H´=2.247, Dmg=22.878 at the first week of Khordād month (end of May). Also, Episyrphus balteatus is dominant speciesin Garmsar region.