初级消费者的种群特征和群落结构关系着食物网能量传递效率。富营养化是我国浅水湖泊面临的主要环境问题，在当今全球气候变暖趋势下，初级消费者如何响应？现有认识还相对匮乏。本项目拟以我国东部地区浅水湖泊螺类为研究对象，基于生态学理论和已有研究，提出假设：气候变暖将降低螺类密度和生物量，导致个体大小小型化；营养盐浓度上升将提高螺类密度和生物量，导致个体大小分布两极化；气候变暖和富营养化双重作用时，变暖将削弱营养盐升高对密度和生物量的正效应。为验证上述假设，拟通过野外调查纬度梯度和不同营养水平湖泊，利用空间替代时间的方法，研究温度升高和富营养化对螺类密度、生物量、大小分布的影响；基于控制模拟实验，研究变暖和富营养化及其交互作用对种群特征和群落结构的影响，并结合典型种类生活史变化的研究探讨其影响机理。本研究将加深气候变暖趋势下富营养化进程中螺类群落演替规律的认识，并为螺类资源保护提供科学数据支撑。

Population and community structure of primary consumer link to energy transfer efficiency of food web. Many shallow lakes in China undergo serious eutrophication in climate warming envelope. How will primary consumer respond to coupled effects of climate warming and eutrophication remains less concerned. Here, we will use gastropods in shallow lakes in East China as a model to examine the coupled effects of climate warming and eutrophication. Based on current ecological theories and related studies, we hypothesize that: (1) climate warming will depress density and biomass of gastropods, and induce declined body size; (2) nutrient enrichment will promote density and biomass of gastropods, with numbers of small and large individuals will both increase; (3) climate warming will weaken the positive effect of nutrient enrichment on density and biomass. To test these hypotheses, field data from shallow lakes along latitude and nutrient gradients were used to examine the effects of warming and nutrient enrichment on density, biomass and body size distribution of gastropods. Mesocosm experiments will be conducted to determine the individual and combined effects of warming and nutrient enrichment on population and community structure of gastropods. This is used to reveal the mechanisms based on life history studies of typical species. This study will fill the knowledge gap of gastropods community succession under eutrophication and climate warming, and provide scientific support for gastropod conservation.