环境变化和功能性状对水生昆虫集合群落的影响研究

当前，人为因素的干扰和气候变暖等造成的环境异质性的丧失使溪流的生物分类和功能多样性面临威胁，进而改变生物集合群落结构。因此研究环境变化和功能性状对集合群落的影响显得尤为迫切和重要。目前，尽管集合群落理论在自然生态系统中的应用已有大量报道，且环境异质性和物种生态等价性(即功能相似性)是集合群落理论背后的核心内容，但集合群落在环境和功能性状空间内的变化规律仍不清楚。本项目以苕溪流域为研究区域，基于以水生昆虫的物种组成和功能特征为基础的研究，通过一系列亚流域和月份时间尺度的标本采集，结合多种统计分析方法评估亚流域间和月份间环境异质性和功能相似性的差异、确定每个亚流域和每个月份的集合群落分布模式以及确定性(环境过滤和种间作用)和随机性过程在集合群落构建中的贡献，揭示环境异质性和功能相似性对集合群落分布模式与构建机理时空动态的影响。为研究溪流生物多样性的保护和管理提供科学依据。

Taxonomic and functional biodiversity of stream ecosystems is currently threatened and changed by the loss of environmental heterogeneity caused by anthropogenic modifications and climate warming, which further lead to metacommunity structure changed. Therefore, there is considerable urgency and important to understand the effects of environmental variation and functional traits on metacommunity. Although the application of metacommunity theory in nature ecosystems have been substantially reported by numerous researchers, and environmental heterogeneity and species equivalence (i.e. functional similarity) are two key ideas behind metacommunity theory, current knowledge of how metacommunity vary within the environmental and trait space remains limited. Our proposal will focus on the taxonomic and functional organisms of stream insect assemblages collected in a number of sub-basins and over months within Tiaoxi basin. Combining a variety of statistical analyses, we will assess the differences in environmental heterogeneity and functional similarity between sub-basins and between months, examine the idealized metacommunity structures and the effects of deterministic (environmental filtering and species interaction) and stochastic processes on metacommunity assembly within each sub-basin and each month. And then, we will explore the effects of environmental heterogeneity and functional similarity on spatial and temporal dynamics of metacommunity structures and assembly mechanisms. Our proposal will bring a scientific base for the conservation and management of biodiversity in stream ecosystems.