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引用本文:林秋奇,赵帅营,韩博平.广东流溪河水库后生浮游动物生物量谱时空异质性.湖泊科学,2006,18(6):661-669. DOI:10.18307/2006.0616
LIN Qiuqi,ZHAO Shuaiying,HAN Boping.Spatial and temporal variation of metazooplankton biomass size spectrum in Liuxihe Reservoir, Guangdong Province. J. Lake Sci.2006,18(6):661-669. DOI:10.18307/2006.0616
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广东流溪河水库后生浮游动物生物量谱时空异质性
林秋奇,赵帅营,韩博平
暨南大学水生生物研究所,广州 510632
摘要:
于2001年4月至2002年12月调查了流溪河水库后生浮游动物,建立后生浮游动物乍物量谱并分析了其时空分布特征.后生浮游动物Sheldon型生物量谱并不是平谱,生物量随着浮游动物粒径(等效球体直径,ESD)的增大而增大.轮虫在粒径大小范围为50-160μm内生物量随着粒径的增大而减少;枝角类(100-512μm ESD)的生物量谱呈‘单峰型'.最大生物量出现在中等大小的粒径组(200-256μm).桡足类的生物量大约占总后生浮游动物生物量的60%,为水库后生浮游动物最重要的组成部分;粒径分布范围较宽,覆盖了轮虫和枝角类.总体而言,桡足类生物量随着粒径的增大而逐渐增大.河流区后生浮游动物标准生物量谱斜率为-0.75;湖泊区标准生物量谱斜率为-0.58在河流区.后生浮游动物生物量中轮虫和无节幼体所占的比例要高于湖泊区,而湖泊区温中剑水蚤和舌状叶镖水蚤的成体和晚期桡足幼体所占的比例高于河流区.由于河流区小个体的优势度大于湖泊区,因此河流区后生浮游动物标准谱的斜率小于湖泊区.从后生浮游动物大小分布的季节性变化看,湖泊区季节性变化不明显;河流区则变化显著,丰水期标准化谱的斜率大于-0.75.枯水期小于-0.75,斜率的变化与水位波动呈正相关关系.水库库盆的形状及水动力学的时空差异可能是影响浮游动物大小分布时空差异的重要非生物因素之一.
关键词:  后生浮游动物  生物量谱  异质性  热带水库
DOI:10.18307/2006.0616
分类号:
基金项目:教育部“优秀青年教师资助计划”;国家自然科学基金(39900022);暨南大学博士学位论文创新项目基金联合资助.
Spatial and temporal variation of metazooplankton biomass size spectrum in Liuxihe Reservoir, Guangdong Province
LIN Qiuqi,ZHAO Shuaiying,HAN Boping
Abstract:
Spatial and temporal variation in metazooplankton biomass size spectrum was studied from April 2001 lo December 2002, in a tropical reservoir, Liuxihe reservoir (South China). The SheldonWesl Lakel)pe size spectrum of metazooplankton (50 to 512jxm equivalent spherical diameter) was nol uniform, but showed an increase in biomass between successive size classes. Within rotifers (50jxm to I60|xm ESD), biomass decreased slightl) in size, while cladoceras (100p,m to 5I2jxm ESD) had maximum biomass concenlration per size class a(medium ranges of body size. Copepods was the most important zooplankton fraction (contributed more than 60% of total zoo-plankton biomass),and covered all 10 size classes from 50 to 512jjliti in this study. Biomass of ro[)epo(is showeci an overall increase in size. As man-made lakes, reservoirs occupy an intermediate position between rivers and natural lakes by corn billing numerous features of rivers and lakes. Due to this unique feature, metazooplankton size distribution changed s|)a-tiaily in the reservoir, and the slopes of size spectra showed a different seasonal pattern between the riveri/ie zone and the lacustrine zone. On average, small sized organisms, rotifers and nauplii, contributed a relatively more percentage biomass in the riverine zone than in the lacustrine zone, whereas adult Mesocyclops thermocyclopoids, Phyl-lodiaptomus tunguidus and their late stage copepodites contributed less percentage biomass in the riverine zone. As a result, the slope of normalized biomass spectrum was more negative in the riverine zorje than (hat in the iaruslrine zone. In llie riverine zone, slopes were more negative than -0.75 when water levt*l decreased in llie dr> seasons ami the re\erse when water level iiKTeased in flood seasons. The len\poral \arialions might he aliribuied lo llie water level flurtuation in the riverine zone. In contrast to the riverine zone, as the depth is deep enough in tht* Jacustrint* zone, anti waler level fluctuation showed no effect on the size distrihution of inetazooplankton. Size (listributimi of metazooplaiikton was relatively stable over seasons.
Key words:  Melazoop lank ton  size spectrum  helerogeneity  tropical reservoir
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