Abstract
The biodiversity of spiders in agroecosystem was studied at the Pandit Jawaharlal Nehru College of Agriculture and Research Institute, Karaikal during kharif (2019) and rabi (2019-20). The spiders were collected at weekly intervals using in situ counts, net sweeping, pitfall traps and litter sampling. A total of 30 species under 22 genera, 15 families were observed. Biodiversity indices viz., Shannon-Weiner Index (2.809- kharif and 2.766- rabi), Simpson Index (0.926- kharif and 0.909- rabi), Margalef Index (4.135- kharif and 4.22- rabi) and Pielou’s Index (0.104- kharif and 0.095- rabi) were computed. Regression with weather parameters during kharif 2019, were non-significant for Thomisus sp. (0.107), Pardosa sumatrana Thorell (0.146), Oxyopes javanus Thorell (0.190), Tetragnatha javana Thorell (0.213) and Tetragnatha mandibulata Walckenaer (0.347); and during rabi 2019-20, for T. javana (0.516), Argiope anasuja Thorell (0.619) showed significance and O. javanus (0.192), Lycosa bistriata Gravely (0.370), T. mandibulata (0.437), these values were non-significant.
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