福建省九龙江江东库区浮游动物的生态研究

于2010年3月-2011年2月对福建省九龙江江东库区的浮游动物进行了生态调查研究.研究结果表明,调查期间共采集到浮游动物99种,其中原生动物20种,轮虫29种,枝角类39种,桡足类11种.浮游动物丰度年均为5 486.73L-1,浮游动物的丰度主要由原生动物和轮虫组成,其中原生动物丰度最高,为4 926.90 L-1,轮虫为552.91L-1,枝角类为5.13 L-1,桡足类丰度最低,年均为1.79 L-1.浮游动物丰度最高值出现在11月,最低值出现在3月.温度是影响浮游动物群落的主要影响因子,轮虫和桡足类丰度分别与叶绿素a(Chl a)浓度存在显著正相关性.挖沙船的频繁活动可能促进了原生动物的生长,降低了浮游动物群落丰富度.短滞留时间和鱼类的捕食压力是造成枝角类和桡足类丰度低下的主要原因.

The Ecological Research of Zooplankton in Jiangdong Reservoir of Jiulong River in Fujian Province

The zooplankton community of Jiangdong Reservoir was investigated in Jiulong River,Fujian province from March 2010 to February 2011.The result indicated that ninety-nine species were identified,of which 20 species were Protozoa,29 species were Rotifera,39 species were Cladocera,and 11 species were Copepoda.The annual average abundance of zooplankton was 5 486.73 L-1,the abundance of zooplankton was mainly determined by Protozoa and Rotifera,of which Protozoa was 4 926.90 L-1,Rotifera was 552.91 L-1,Cladocera was 5.13 L-1,and Copepoda was 1.79 L-1.The highest zooplankton abundance appeared in November,while the lowest in March.Temperature was the main influence factor of zooplankton community,and the abundance of Rotifera and Copepoda showed a significant positive relationship with Chlorophyll a.Sand mining probably accelerated the development of Protozoa,decreased the Margalef index of zooplankton.The pressure of fish prey and short retention time were the main reasons for low abundance of Cladocera and Copepoda.