白洋淀异养鞭毛虫群落特征及其与环境因子的相关性  

Abundance and biomass of heterotrophic flagellates in Baiyangdian Lake,as well as their relationship with environmental factors

作　　者：赵玉娟[1] 李凤超[1] 张强[2] 张彦[2] 

机构地区：[1]河北大学生命科学学院,河北省无脊椎动物系统学与应用实验室,保定071002 [2]保定市水文水资源勘测局,保定071000

出　　处：《生态学报》2012年第21期6819-6827,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(31172063);河北省自然科学基金资助项目(C2012201010)

摘　　要：于2010年4月至2011年3月调查了白洋淀3个典型湖区表层水体异养鞭毛虫丰度和生物量及环境因子的周年变化,分析了异养鞭毛虫群落与环境因子的相关关系。白洋淀表层水体异养鞭毛虫的丰度和生物量分别介于100—3200个/mL和35.98—2328.85μg/L之间,周年平均值分别为1054个/mL和532.93μg/L。白洋淀小型异养鞭毛虫(<7μm)的丰度占总丰度的47.11%,而生物量只占总生物量的6.82%;中型异养鞭毛虫(约7—14μm)的丰度占总丰度的37.42%,生物量占总生物量的39.21%;大型异养鞭毛虫(>14μm)的丰度虽只占总丰度的15.47%,却贡献了53.97%的生物量。相关性分析表明,异养鞭毛虫丰度与总氮和氨氮呈显著性负相关,与pH值、细菌丰度、纤毛虫丰度及叶绿素a含量呈显著性正相关;异养鞭毛虫生物量与pH值、溶解氧、纤毛虫丰度及叶绿素a含量显著正相关,与总氮、氨氮呈显著负相关。结果表明异养鞭毛虫群落在微食物环中起着枢纽作用。The significance of free living heterotrophic flagellates in the microbial food web as the main consumers of bacteria and picophytoplankton has now been broadly accepted. However, heterotrophic flagellates have been largely overlooked in limnological studies, mainly because of methodological and taxonomic problems. During the period from April 2010 to March 2011, the planktonic heterotrophic flagellate community parameters, namely abundance, biomass, size distribution, and taxonomic composition were investigated monthly using a live-counting technique. Surface water samples were taken from three sampling sites in Baiyangdian Lake, a typical large shallow fresh water lake in north China. In order to determine the factors related to heterotrophic flagellate communities, twelve environmental factors （including physicochemical index and biotic parameters） , namely pH, water temperature （ ℃ ） , electrical conductivity, dissolved oxygen, total phosphorus, total nitrogen, ammonia nitrogen, nitrate nitrogen, chlorophyll-a concentration, the abundance of bacteria, planktonic algae and ciliate were also measured. The relationships between the heterotrophic flagellate community parameters and the environmental factors were also analyzed. Results showed that the water temperature and pH of the three sampling sites varied from 0. 2 ℃ to 34.2 ℃ and varied from 7.7 to 9.3 respectively; the annual mean concentration of total phosphorus, total nitrogen, ammonia nitrogen and nitrate nitrogen were in the range of 0. 20 1.23mg/L, 1.70-- 28.91 mg/L, 0. 65--21.63 mg/L and 0. 63--2. 61 mg/L, respectively; the annual mean concentration of chlorophyll-a varied from 1.4 to119.3 μg/L; the annual mean abundance of bacteria, planktonic algae and ciliate were in the range of （ 1. 998--4. 827） ×106 eells/mL, 316--9782 ind./mL, and 1--238 ind./mL, respectively; the abundance and biomass of heterotrophic flagellates in surface water of Baiyangdian Lake were in the range of 100--3200 ind./ml and 35.98-- 2328.85 μg/L, and the

关 键 词：异养鞭毛虫 群落特征 丰度 生物量 

分 类 号：Q958.8[生物学—动物学]