Plant-pollinator interactions in a biodiverse meadow are rather stable and tight for 3 consecutive years
Plant-pollinator interactions in a biodiverse meadow are rather stable and tight for 3 consecutive years
复制标题
生物多样性草地中植物与传粉媒介的相互作用连续三年相当稳定和紧密
DOI：
10.1111/1749-4877.12190
复制
发表时间：
2016-05-01
影响因子：
3.3
通讯作者：
Huang, Shuangquan
中科院分区：
文献类型：
--
作者：
Fang, Qiang;Huang, Shuangquan
在自然群落中，植物与传粉者之间的相互作用在不同年份变化很大。虽然研究了物种组成及其基本结构的变化，以了解传粉网络的动态性质，但对任何自然群落中同一植物与传粉者物种之间相互作用强度的时间动态知之甚少。传粉媒介对花性状进化的选择作用在植物与传粉媒介相互作用的时间变化中可能会减弱。为了量化植物与传粉者相互作用的时间变化和相互作用强度（观察次数），我们连续3年比较了香格里拉地区高寒草甸植物与传粉者之间的加权网络。虽然植物与传粉者的相互作用具有高度的动态性，相同的相互作用仅占对年之间相互作用总量的10.7%，但相互作用的多样性是稳定的。这些相同的相互作用占总访问量的41.2%，并且在强度和加权巢度上相似。在植物物种中，72.6%的物种在对年之间被相同的传粉者访花，占总访花量的一半以上，在功能群水平上占四分之三。更广泛的传粉媒介贡献了更多的连通性，并且在多年的网络中更加中心。然而，植物物种没有类似甚至相反的趋势，这表明专门的植物物种也可能是传粉者网络的中心。随着传粉者种类的增加，传粉者组成的变异减小，说明广义植物的传粉者分配较为稳定。广义传粉者与特化植物之间稳定、紧密的相互作用是所研究群落的基石。
Plant-pollinator interactions can be highly variable across years in natural communities. Although variation in the species composition and its basic structure has been investigated to understand the dynamic nature of pollination networks, little is known about the temporal dynamic of interaction strength between the same plant and pollinator species in any natural community. Pollinator-mediated selection on the evolution of floral traits could be diminished if plant-pollinator interactions vary temporally. To quantify the temporal variation in plant-pollinator interactions and the interaction strength (observed visits), we compared weighted networks between plants and pollinators in a biodiverse alpine meadow in Shangri-La, southwest China for 3 consecutive years. Although plant-pollinator interactions were highly dynamic such that identical interactions only accounted for 10.7% of the total between pair years, the diversity of interactions was stable. These identical interactions contributed 41.2% of total visits and were similar in strength and weighted nestedness. For plant species, 72.6% of species were visited by identical pollinator species between pair years, accounting for over half of the total visits and three-quarters at the functional group level. More generalized pollinators contributed more connectiveness and were more central in networks across years. However, there was no similar or even opposite trend for plant species, which suggested that specialized plant species may also be central in pollinator networks. The variation in pollinator composition decreased as pollinator species numbers increased, suggesting that generalized plants experienced stable pollinator partition. The stable, tight interactions between generalized pollinators and specialized plants represent cornerstones of the studied community.