光照和营养对悬浮物－浮游动物间化学计量特征失谐的生态学效应

项目名称： 光照和营养对悬浮物－浮游动物间化学计量特征失谐的生态学效应

项目编号： No.31200361

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 生态学

项目作者： 王松波

作者单位： 中南民族大学

项目金额： 20万元

中文摘要： 悬浮物易受光照和营养供应的影响产生多变的元素比，而浮游动物体内的元素比相对恒定，这种食物元素供应与消费者需求比例之间的失谐可能影响到浮游动物的生态效率和湖泊食物网的结构稳定性。本项目拟采用围隔实验，通过设置不同的光照和营养梯度，探讨各种处理下的食物质量对浮游动物群落结构的影响；阐明光照和营养对悬浮物－浮游动物间化学计量特征失谐大小的影响规律；并通过中型浮游动物培养实验测定摄食率，分析失谐大小对浮游动物下行效应的调节作用以及对浮游动植物间能量传递效率的作用规律。这些关系的阐明不仅有利于丰富我们对浮游动物群落结构沿着环境梯度变化的认识，还有利于加深我们对浮游食物网能量传递和物质循环过程的理解。

中文关键词： 光照；营养；浮游动物；悬浮物；化学计量学

英文摘要： The stoichiometry of seston is highly flexible when facing diverse light and nutrient supply. zooplankton stoichiometry, however, is rather homeostatic. Thus, the stoichiometric mismatch between food supply and zooplankton demand may impose negative effects on the ecological efficiency of zooplankton and on the structural stability of pelagic food webs in lakes. In this project enclosure experiments will be performed with differing light and nutrient supply. The impacts of food quality among contrasting treaments on zooplankton community structure will be assessed, and how the mismatch degree responses to the light and nutrient supply will be clarified. Meanwhile, an incubation experiment will be set up to explore how the grazing pressure of mesozooplankton on phytoplankton is regulated by the mismatch degree. Also, the influences of the mismatch degree on the energy transfer efficiency between phyto- and zoo-plankton will be studied. The elucidation of these relationships will not only improve our understanding of the zooplankton community dynamics along the environmental gradients, but also enhance our comprehension of the energy transfer and material cycling in pelagic food webs.

英文关键词： light；nutrient；zooplankton；seston；stoichiometry