沉水植物表型可塑性以及谱系关系在局域和区域尺度上对群落构建的影响

群落构建和多样性维持是群落生态学讨论的焦点问题，环境作用和空间限制被广泛用来解释集合群落的构建。沉水植物具有高度的表型可塑性，种群扩散受到水体连通性的强烈限制，适合开展集合群落功能多样性研究。本项目采用嵌套样方调查方案，对两个湖区（云贵高原湖区、东北平原-山地湖区）内不同流域中的各类水体开展沉水植物群落调查，获取样地环境因素、空间信息、沉水植物群落结构、功能性状及变异；通过GenBank获取沉水植物的ITS、trnL、matK和rbcL等序列数据，构建物种间的谱系关系。最终形成5套矩阵：样地×物种、样地×环境变量、样地×空间变量、物种×功能性状、物种×物种（谱系关系），使用基于贝叶斯分级方法建立的群落分层建模工具（HSMC模型）对其进行综合分析，揭示表型可塑性和谱系关系在局域和区域尺度上对沉水植物群落功能多样性的影响，并通过设置不同情景对群落演替进行预测。本项目研究成果将丰富集合群落理论体

Identify and disentangle the assembly processes is one of the main goals of modern community ecology. Environmental and spatial effects are often used to explain the meta-community assembly. As submerged macrophytes present highly phenotypic plasticity and dispersals are restricted strongly by water flow, they were considered as an ideal group for the study of meta-community. Based on nested sampling design we plan to make field survey on submerged macrophyte communities in different catchments from two lake regions (Yunnan-Guizhou plateau lake region and Northeast plain-mountain lake region). The environmental factors, spatial information, submerged macrophyte community structure, functional traits and variations will be measured and collected from sampling plot to water body, catchment and region. The sequences of ITS, trnL, matK and rbcL of each species will be achieved from GenBank and used to generate phylogenetic correlations between each pair of species. The raw data will be included in 5 matrices: sites × species abundance, sites × environmental traits, sites × spatial traits, species × functional traits, species × species (phylogenetic correlation). We will use the Hierarchical Modelling of Species Communities (HMSC) to identify the effects of phenotypic plasticity and phylogenetic correlation on community assembly in local and regional scales, and use this model to predict submerged macrophyte community succession in specific scene. These results will enrich the theory of meta-community assembly, and also can provide scientific instructions about the restoration of submerged vegetation in degraded habitats.