Diversity indeces of predaceuse Syrphid flies (Diptera: Syrphidae) in some agro-ecosystems of Kermanshah Province

Some bio-ecological studies were carried out on the syrphid flies in several agro-ecosystems in temperate regions of Kermanshah province during 2013-16. Fifteen aphidophagus syrphid species were identified which Eupeodes corollae was the dominant species. For Evenness index, the highest value was belonged to irrigated wheat and the lowest one was belonged to stone fruit orchards, which were evaluated as 0.72 and 0.25, respectively. In biennial calculation of the Margalef index, rain-fed wheat and canola have the lowest and highest values of this index which were evaluated as 4.77 and 11.83, respectively. For Sorenson similarity in first year, the highest and lowest degree of similarity was belonged to apple-stone fruits and apple-canola with values of 0.88 and 0.5, respectively. In the first year, Shannon- Wiener index for apple trees, irrigated wheat, canola, stone fruit trees and rain-fed wheat, were determined as 1.42, 1.41, 1.18, 1.07 and 1.01, respectively. In the following year, these indices were evaluated for irrigated wheat, canola, apple and stone fruit trees were evaluated as 1.49, 1.28, 1.48 and 0.86, respectively. The high Shannon-Wiener index indicated the greater diversity of species based on the number of species variance analysis of this factor using t student test revealed that all of the agroecosystems have an identical species diversity (P> 0.05) The evaluated agroecosystems have an appropriate biodiversity of syrfid predator flies and this biodiversity is a key to their sustainability and survivor.