تنوع گونه‌ای تریپس‌ها (Insecta : Thysanoptera) در دو اکوسیستم مختلف شهرستان ایوان (استان ایلام)

In this study the diversity of thrips species in two different ecosystems were investigated in Eyvan (Ilam province) during 2018. Sampling was performed weekly and by beating chickpea, lentil and rangeland plants onto a white dish tray. Microscopic slides were prepared and all samples counted. Species abundance was calculated using the obtained data and considering species diversity and their relative abundance, species diversity index were evaluated using PAST var 3.04 software. A total of 11135 samples belonging to 14 species and 9 genera were collected. Species include Thrips meridionalis (Priesner), Frankliniella occidentalis (Pergande), Aeolothrips intermedius Bagnall, Haplothrips ganglbaueri Schmutz, Thrips tabaci Lindeman, Aeolothrips collaris Prienser, Frankliniella intonsa (Trybom), Frankliniella tenuicornis (Uzel), Anaphothrips sudanensis Trybom, Scolothrips longicornis Priesner, Sitothrips arabicus Priesner, Kakothrips pisivorus (Westwood), Thrips vulgatissimus Haliday and Melanthrips fuscus (Sulzer). Results showed that in chickpea and lentil fields, Thrips tabaci were 56.13% and 58.59%, respectively, and in rangeland Aeolothrips intermedius were 27.89%, respectively had the highest abundance. The diversity of alpha species for chickpea, lentil fields and rangeland was 4, 8 and 11, respectively, and also the diversity of beta species between chickpea - lentil, chickpea - rangeland and lentil - rangeland were 4, 6, and 7, respectively. The diversity of gamma species was 14. Also, the values of species diversity indices calculated between legumes and rangelands showed that these values were statistically significant (P≤0.05). Shannon-Wiener index, Simpson index, Pielou evenness and Margalef species richness in chickpea fields were 1.40, 0.63, 0.67 and 0.82, respectively, in lentil fields were 1.18, 0.59, 0.38, and 0.80, respectively and in rangeland values of indices were 1.84, 0.81, 0.77 and 1.21 respectively. Also, species richness similarity based on Sorensen and Jaccard indices between chickpea - lentil fields, chickpea – rangeland and lentil - rangeland were 0.66–0.50, 0.53–0.36 and 0.52–0.34 respectively, indicating higher species similarity between chickpea and lentil fields and also lower species similarity between chickpea and lentil fields with rangeland. In general, the results of this study showed that the species diversity of rangeland was higher than that of chickpea and lentil fields.