اثر پوشش گیاهی بر تنوع زیستی کنه‌های پیش‌استیگمایان (Acari: Prostigmata) در ساحل رودخانه کارون

Species diversity of Prostigmata (Acari: Prostigmata) on the beach of Karun River with a variety of vegetation; meadow (Alhagi sp., Prosopis stephaniana and Imperata cylindrica), grassland (Poa pratensis) and trees (Prosopis cineraria, Eucalyptus gunnii and Phoenix dactylifera) located in Ahvazwere studied for one Year (2013-2014). For this purpose, a total of eight sampling were done in which five samples with a weight of approximately one kilogram of soil were taken from different types of vegetation to a depth of 10 cm and the existing samples were isolated and identified using a Berlese funnel in the laboratory. The identified families included Allochaetophoridae, Caligonellidae, Cunaxidae, Erythraeidae, Eupodidae, Pygmephoridae, Tenuipalpidae and Tetranychidae. Diversity indices of Shannon-Wiener, Margalf and Evenness indices of Simpson and Camargo was calculated based on species abundance using SDR software. Meadow vegetation with 51.03% had the highest abundance of Prostigmata among all types of vegetation. In the meadow Bakerdania sp. with 44.6%, in the grassland Molothrognathus mehrnejadi with 31.7% and in the trees Molothrognathus mehrnejadi species with 26.7% had the highest abundance. Among the collected species, Bakerdania sp., had the highest abundance with 35.86% and was collected from different types of vegetation. Also, Pygmephoridae family had the highest abundance (35.86%) and Cunaxidae family had the lowest abundance (2.76%). The highest diversity of Shannon-Wiener and Margalf was 2.1 and 2.6 for trees, respectively. The highest evenness indices of Simpson and Camargo in trees were 0.82 and 0.95, respectively, which shows that despite the high population of mites, their evenness has also increased in this vegetation.