摘要
试验采用2.5 m×2.5 m围隔,共设置4个试验鱼密度:0、116、176、和316 g/m2,研究了不同密度的鲢对浮游植物的影响。结果表明,仅在无鱼围隔中有大量个体较大的透明溞(Daphnia galeata)产生,并且在无鱼围隔中,浮游植物生物量最低,透明度显著的高于其他的围隔。与其它类似的围隔试验所不同的是:在无鱼围隔中没有蓝藻水华的发生。在有鱼围隔中,浮游甲壳动物始终由个体较小的微型裸腹溞占优势。并且浮游植物的生物量随着鲢密度的升高而降低。浮游植物的种类组成在不同鲢密度的围隔中比较相似,与无鱼围隔相比,绿藻和裸藻生物量所占的比率较低,蓝藻生物量所占的比率较高。
The response of phytoplankton to a gradient of silver carp biomass were assessed using enclosure methods. The gradient of four silver carp biomass levels was set as follows： 0, 116, 176 and 316 g/m^2. An outburst of Daphnia only occurred in fishless enclosures where phytoplankton biomass was the lowest and water clarity significantly increased. No large colonial cyanobacterial blooms occurred in the fishless enclosures as predicted. While among fish enclosures, the small-sized Moina mi crura dominated throughout the experiment and phytoplankton biomass decreased with increased fish bi omass. Cryptophyta was the most dominant group in most of the enclosures and the lake water. The fishless enclosure had lower proportion of Cyanophyta but higher proportion of Chloriphyta and Euglenophyta.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
2006年第3期277-280,共4页
Journal of Huazhong Agricultural University
基金
华南农业大学博士启动基金项目(4300-K05108)
广东省自然科学基金项目(05300351)资助
关键词
浮游植物
鲢
围隔
phytoplankton
silver carp
enclosure
