Data from: Constructing more informative plant-pollinator networks: visitation and pollen deposition networks in a heathland plant community

Interaction networks are widely used as tools to understand plant-pollinator communities, and to examine potential threats to plant diversity and food security if the ecosystem service provided by pollinating animals declines. However most networks to date are based on recording visits to flowers, rather than recording clearly-defined effective pollination events. Here we provide the first networks that explicitly incorporate measures of pollinator effectiveness (PE) from pollen deposition on stigmas per visit, and pollinator importance (PI) as the product of PE and visit frequency. These more informative networks, here produced for a low diversity heathland habitat, reveal that plant-pollinator interactions are more specialised than shown in most previous studies. At the studied site the specialisation index H2’ was lower for the visitation network than the PE network, which was in turn lower than H2’ for the PI network. Our study shows that collecting pollinator effectiveness data is feasible for community-level studies in low diversity communities and that including information about pollinator effectiveness can change the structure of interaction networks. This could have important consequences for our understanding of threats to pollination systems.互作网络（interaction networks）已被广泛用作解析植物-传粉者群落（plant-pollinator communities）的工具，同时可用于探究当传粉动物所提供的生态系统服务衰退时，植物多样性与粮食安全面临的潜在威胁。然而迄今为止，绝大多数此类网络均基于对花朵访问行为的记录，而非对明确定义的有效传粉事件的记录。本研究首次提供了一类明确纳入传粉者效能（pollinator effectiveness, PE）与传粉者重要性（pollinator importance, PI）指标的互作网络：其中PE指标基于单次访问在柱头上的花粉沉积量计算，PI指标则为PE与访问频率的乘积。针对低多样性石楠生境构建的这类信息更为丰富的网络显示，植物-传粉者互作的特化程度高于多数既往研究的结果。在所研究的样地中，访问网络的特化指数H2’低于PE网络，而PE网络的H2’又低于PI网络。本研究证实，在低多样性群落中开展群落水平研究时，收集传粉者效能数据具备可行性，且纳入传粉者效能信息可改变互作网络的结构。这一发现对我们理解传粉系统所面临的威胁具有重要意义。