摘要
于2000～2003年调查了新建水库飞来峡水库（1999年蓄水）轮虫和甲壳类浮游动物的动态特征。共检到轮虫68种，枝角类18种和桡足类13种。轮虫、枝角类和桡足类的半度均不高，分别为0．2～88．6，0．1～13和0.4～13．8ind·L^-1。最高丰度均出现在蓄水后的第4年（2002年3月）。在水库开始蓄水之后，轮虫先以螺形龟甲轮虫（Keratella cochlearis）为优势种；然后在蓄水后的第4年（2002年3月）由于长圆疣毛轮虫（Synchaeta pectinata）种群密度大幅度上涨，长圆疣毛轮虫取缔螺形龟甲轮虫成为优势种；此后，随着长圆疣毛轮虫种群回落。螺形龟甲轮虫又成为优势种。对于枝角类来说，水库蓄水初期，短尾秀体溞（Diaphanosoma brachyurum）和长额象鼻溞（Bosmina longirostris）交替成为枝角类的优势种；在蓄水后的第4年，长额象鼻溞种群密度上涨，成为绝对优势种；此后，长额象鼻溞种群回落．但仍然为绝对优势种。对于侥足类来说，在调查期间均以桡足幼体为主，成体丰度很低。飞来峡水库属河流型水库，在调查期间滞留时间为1．3～14，2d，高的稀释和平流损失率造成浮游动物丰度很低。滞留时间的变化与轮虫、枝角类和桡足类种群波动密切相关；叶绿素a对它们的种群波动影响则不明显，但与长圆疣毛轮虫和长额象鼻溞均显著正相关。在相对较长的滞留时间（14．2d）和较丰富的食物的条件下，长圆疣毛轮虫和长额象鼻溞种群密度大幅度上涨，并使总浮游动物丰度在蓄水后的第4年出现最高值。
In 2000 2003, an investigation was made on the dynamics of rotifer and crustacean zooplankton in the Feilaixia Reservoir which was constructed in 1999. Sixty-eight species of rotifera, 18 species of cladocera, and 13 species of copepoda were observed. The abundance of rotifera, cladocera and copepoda was 0.2 - 88.6, 0.1- 13 and 0.4 - 13.8 ind· L^- 1, respectively, with the peak occurred in March 2002, the fourth year after filling. When the filling started, rotifero was dominated firstly by Keratella cochlearis, and then by Synchaeta pectinata whose population size increased rapidly in March, 2002. Since then, as the population of S. pectinata decreased, K . cochlearis became the dominant species. Diaphanosoma brachyurum and Bosmina longirostris were the alternate dominant cladoceran species at first, while B. longirostris became the predominant one after August 2001. As for copepoda, nauplii and copepodites, their young ones were often much more abundant than the adults. During investigation, the water retention time was less than 14 days, and the high flushing rare made the zooplankton abundance in the reservoir very low. The temporal variation of rotifera, cladocera and copepoda was primarily affected by water retention time. There was little evidence for the regulation of zooplankton＇s temporal fluctuation by the changes in food quantity or quality. Only S. pectinata and B. longirostris had a strong positive correlation with chlorophyll-a. In 2002, the year with the longest water retention time （14 days） and relatively rich food, the populations of S. pectinata and B. longirostris increased rapidly, and the ‘ upsurge＇ of zooplankton abundance was observed.
出处
《生态学杂志》
CAS
CSCD
北大核心
2006年第3期270-276,共7页
Chinese Journal of Ecology
基金
国家自然科学基金资助项目(39900022)
教育部"优秀青年教师资助计划"资助项目
广东省水利厅重点项目资助。
关键词
新建水库
滞留时间
浮游动物
newly constructed reservoir, retention time, zooplankton,
