Abstract
The diversity of hoverfly communities was studied during the growing season (April–September) of 2009 in the eastern part of Zanjan province. Adult specimens were collected and identified. A total of 28 species with 1019 hoverfly individuals were collected, among which Eristalis tenax (Linnaeus), Sphaerophoria scripta (Linnaeus), and Eupeodes corollae (Fabricius) were found to be the most abundant. Monthly variations in species diversity, richness, and evenness of hoverflies were compared. The highest and lowest degrees of species diversity, richness, and evenness were recorded in June and April, respectively. Adult hoverflies first appeared in April reaching a peak in July. However, later in summer their abundance started declining with a decrease recorded in September.
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