Abstract: Transect and focal animal scanning method were used to collect the birds’ feeding behavior on fruit plants in Guilin Botanical. The information of the interaction relationship between them were analyze to discuss the utilization rule of birds on fruit plants and the seasonal changes of network parameters. 2 174 interactions events were recorded between 14 bird species (2 orders and 7 families) and 13 plant species (8 orders and 11 families) throughout the year. Each plant species interacted with 7.15±0.88 birds, and each bird species interacted with 6.57±1.20 plant species. The interaction connectance (C=0.51), weighted nestedness (0.93) and interaction diversity (H₂=3.81) of the network were higher, while the specialization (H′₂=0.10) was lower. Cayratia japonica and Cinnamomum camphora were the most consumed by birds, while Pycnonotus xanthorrhus, Hemixos castanonotus and Ixos mcclellandii are the bird species that consumed most of the fruit plants, including the 13 plant species. The feeding frequency of birds in autumn (38.79%) and winter (33.15%) accounts for the largest proportion of the total annual feeding frequency. The weighted nestedness (ωNODF=0.92) and interaction diversity (H₂=4.78) between birds and fruit plants is the largest in autumn, the largest connectance (C=0.53) in winter, and the largest specialization (H′₂=0.27) in summer. The results shows that the interaction relationship between animals and plants in urban green space can be complex and variable according to different seasons. The network analysis can provide important information for studying the changes of ecosystem function state in rapidly changing habitats.

Key words: interaction network, frugivorous bird, fruit plant, seasonality