富营养化问题一直是海洋环境生物学研究的热点之一。周丛原生动物因其在微食物网内的重要功能地位而成为海洋生态学及生物监测等领域重要的研究对象。迄今人们对该类生物群落的功能结构动力学及对水体富营养化水平的响应模式了解仍很粗浅。为此，本课题拟选择青岛黄海近岸多种典型生境，围绕群落功能结构动力学探讨该类生物对氮、磷等主要营养盐变化的响应模式。①借助原位模式及实验生态学手段探讨其群落功能结构的构建模式、功能冗余类群的上下行关系、优势功能种群的动态演替规律及其对水体富营养化的响应模式；②开展群落实验生态学研究，探讨原生动物群落功能动态与营养盐变化的关系；③结合种群落及种群实验生态学试验，揭示其在梯度营养盐浓度和食物水平相互作用下的生态学特征；④构建生态学模型。本工作将首次基于群落功能结构动力学特征，探讨该类生物群落对海洋近岸水体富营养化的响应模式，为原生动物群落功能结构动力学模型研究提供重要的理论基础。

The eutrophication issues in coastal waters have been one of the most important topics in the fields of environmental conservation for marine ecology. Periphytic protozoa have been employed as robust bioindicators for bioassessment of water quality and ecological researches since they play an important role in the functioning of the marine microbial food webs. So far, previous studies have indicated that the understandings on the response model of functional dynamics in protozoan community structures to environmental changes are still comparatively superficial. Therefore, in this project we will investigate the response model of functional dynamics in periphytic protozoan community structures to the eutrophication by nutrients (e.g., nitrogen and phosphorus) in coastal waters of the Yellow Sea, Qingdao, China. Our objectives of this study focus on: a) to document the functional dynamics in the protozoan community structures, the interspecies interactions between functional redundant species, spatial/temporal succession dynamics of dominant functional species, and their relationships to the eutrophication levels by in situ field and laboratory studies; b) to reveal the relationships between the functional patterns of the protozoan communities and the nutrients; c) to measure the ecological parameters of the functional species by the experimental tests of both community and population growth under the experimental conditions, i.e., within gradient concentration of nutrients and with different food levels; and d) to establish mathematical models based on the community/population growth parameters to illustrate the response model by integrating the functional redundant species coexistence theories. This work will be the first study on the response model of the protozoan communities to the eutrophication in coastal waters based on structuring dynamics of communities. The results will hopefully provide theory basis for marine bioassessment and a better understanding on the maintaining model of functional dynamics in protozoan community structures in marine ecosystems.