基于种群动力学特征探讨原生动物对海洋近岸水体营养盐变化的响应机制

项目名称： 基于种群动力学特征探讨原生动物对海洋近岸水体营养盐变化的响应机制

项目编号： No.41476128

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 李继秋

作者单位： 华南师范大学

项目金额： 95万元

中文摘要： 海洋近岸水体的富营养化一直是海洋环境生物学研究的热点之一。原生动物因其在微食物网内的重要功能而成为海洋生态、环境监测等领域重要的环境指示生物。目前的研究表明我们对原生动物群落响应水体营养化水平变化机制的了解仍较粗浅。为此，本课题拟选择海洋近岸水体典型生境，基于种群动力学特征探讨其原生动物群落对氮磷营养盐变化的响应机制。①借助in situ模式及实验生态学手段探讨原生动物群落结构、种群动态演替规律及其对环境因子变化的响应模式；②开展种群生长、种间竞争和捕食动力学试验，测定其在梯度营养盐浓度和食物水平相互作用下的生态生理学特征；③构建种群动力学数学模型并④结合物种共存机制探究原生动物群落多样性对氮磷营养盐变化的响应机制。本工作首次将种群生态生理学特征与物种共存机制整合并据此探讨原生动物群落多样性对海洋近岸水体营养盐变化的响应机理，将为海洋生物监测、海洋生态系统群落多样性的维持机制提供理论依据。

中文关键词： 原生动物；群落多样性；种群动力学；氮磷营养盐；响应机制

英文摘要： Researches about the eutrophication in coastal waters have been always one of the most important topics in the areas of marine environmental biology. Protozoa has been one of the most popular bio-indicators for environmental monitoring considering their key ecological functions in the marine microbial food web. Present studies indicated that our understandings on the response mechanisms of protozoa community to environmental factors are still comparatively superficial. Therefore, this project will select the typical coastal waters, to investigate the response mechanisms of protozoa community to the variations of nitrogen and phosphorus nutrients based on the population dynamics. Researches will focus on the following studies. 1) To characterize the protozoa community structure and dominant population succession dynamics as well as their response patterns to mariculture environments by in situ field and laboratory studies; 2) To measure the ecophysiological parameters of the key species by the dynamics tests of population growth, interspecies competition and predation under the interactions between gradient concentration of nutrients with different food levels; 3) To establish mathematical dynamics models based on the ecophysiological parameters to illustrate the response mechanisms by integrating the species coexistence theories. This work will be the first study investigating the response mechanisms of the protozoa community structure to the variation of nitrogen and phosphorus nutrients in coastal waters by incorporating ecophysiological parameters into species coexistence theories. The results will hopefully provide theory basis for marine biomonitoring and a better understanding on the maintaining mechanisms of community diversity in marine ecosystems.

英文关键词： Protozoa;Community biodiversity;Population dynamics;Nitrogenous and phosphorus nutrients;Response mechanisms