Plant sexual diversity affects the structure and dyn-
报告题目：Plant sexual diversity affects the structure and dyn-
系列：“生态与环境讲坛”系列第 164 讲
时间：： 2017年3月9日 (周四) 上午9:10-12:00
摘要：Although it has long been recognized that the diversified sexual systems of plants could influence community patterns and pollination specialization, plant reproductive traits are not usually incorporated to quantify plant-pollinator networks. In this study, we observed 1776 visitations corresponding to 84 pollinator species and 28 plant species (9 dioecious plants) in the understory throughout the February to November flowering season in 2013 and 2014. We constructed three networks by respectively combining visitations to dioecious female and male plants at species level, separating them, and retaining the shared visitations between them. The results showed that when the shared visitations between male and female plants were considered, most dioecious and hermaphrodite plants were separated to different modules and the modularity was increased. Modules dominated by dioecious plants were associated with small insects (flies and beetles), while the hermaphrodite modules were associated with bees. From these data, we also created plant-pollinator networks across four sites and four seasons and calculated three common network indices for each: interaction evenness, complementary specialization and weighted nestedness. We found that plant-pollinator communities had a high turnover between seasons, while the network structure properties remained unchanged. The diversity of plant sexual phenotypes and pollinator functional groups did not show difference between rainy and dry seasons. The compositions of plant-pollinator communities showed a high turnover between ridge and valley sites. The diversity of plant sexual phenotypes and pollinator function groups were higher in ridge site than in valley site. In ridge site, our networks displayed significantly lower complementary specialization. The other two network properties did not differ between the two sites. In networks with greater plant sexual diversity, our network indices indicated higher level of pollinator diversity, with most of the pollinators being generalists of the dioecious plants. This suggests that dioecious plants can provide quality resources for generalist pollinators and communities with high plant sexual diversity can support and sustain plant-pollinator networks.