Analysis seasonal change and community function of diversity of spiders and their insect prey in the Poyany Park Nanji Wetland National Nature Reserve

• 1、Department of Biology, East China University of Technology, Nanchang 330013

Abstract：It aims to explore the indicator effect of spiders and their insect prey on the stability of wetland ecosystem structure and energy and material cycle, and provide reference for the protection and utilization of biodiversity in Nanji Wetland National Nature Reserve of Poyang Lake. Combined with the principle of landscape ecology, ecological quantitative investigation and diversity analysis methods such as community sample site setting and observation, associated specimen collection and identification were adopted. This survey collected a total of 73 species of spiders in 16 families and 50 genera, of which 15 unidentified species, 8 newly recorded species in Jiangxi province (including 1 new male record). In addition, it is more genus and species number of Salticidae, Thomisidae, Tetragnathidae, Araneidae and Lycosidae, more individual number of Linyphiidae in spring and summer, and more of Oxyopidae in autumn and winter. Meanwhile, insect prey of these spider was collected 83 species,79 genera, 11 order. It is more insect of Diptera and Coleoptera in spring and summer, and more insect of Orthoptera, Diptera, Hymenoptera, Coleoptera and Hemiptera in autumn and winter. (1) The community structure and function analysis shows that the Nanji shrub provides shelter for spider breeding and acts as a storehouse, the Nanji meadow is a platform for spider actual combat and evolution of their feeding behavior, and the Nanji forest is a pedal of limited time convergence and timely flight for all kinds of spiders. In spring and summer, aquatic or habitat insects are the main preferred prey or potential prey of spiders, becoming the gathering place or shelter for uncommon insects; they dominate the height of richness, dominance, diversity and evenness of the spiders and their insect prey respectively. (2) The cluster analysis shows that the frequency and continuity of communication among each spider communities in Nanji wetland are limited by regional heterogeneity and spatial distance, and the cohesion and divergence function of community types are stable, and the frequency and continuity of communication among each insect prey communities are affected by time domain homogeneity and seasonal phenology, and the edge difference of community types and patch function are stable. (3) The correlation analysis suggests that the diversity indices of spiders and their insect prey communities were correlated in spring, summer, autumn and winter and in general, and some spatiotemporal indices were intercorrelated. Changes in phenological conditions such as geographical or seasonal temperature and humidity are their main driving force. Spiders and insects are two important intermediate links in the food chain, which together maintain the operation and balance of organic field ecosystems such as the Poyang Lake Nanji Wetland National Nature Reserve.

Keywords： the Nanji wetland spider insect prey diversity seasonal change community function