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引用本文:薛颖昊,席贻龙,张根.粉煤灰污染影响萼花臂尾轮虫(Brachionus calyciflorus)种复合体空间分布的原因.湖泊科学,2012,24(1):137-141. DOI:10.18307/2012.0119
XUE Yinghao,XI Yilong,ZHANG Gen.Impact on spatial distribution of Brachionus calyciflorus species complex by coal ash pollution. J. Lake Sci.2012,24(1):137-141. DOI:10.18307/2012.0119
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粉煤灰污染影响萼花臂尾轮虫(Brachionus calyciflorus)种复合体空间分布的原因
薛颖昊, 席贻龙, 张根
安徽师范大学生命科学学院安徽省高校生物环境与生态安全省级重点实验室, 芜湖 241000
摘要:
为探讨粉煤灰污染影响萼花臂尾轮虫(Brachionus calyciflorus)种复合体在灰湖、汀棠湖和凤鸣湖分布的生态学机制,本文研究了曝气自来水(对照)、20%、40%、60%、80%和100%的澄清灰湖水对采自三湖泊中的轮虫姐妹种Ⅰ和汀棠湖中的轮虫姐妹种Ⅱ的种群增长率、混交雌体数/非混交雌体数、携卵雌体数/不携卵雌体数和休眠卵产量的影响.结果显示,无论实验用水中的澄清灰湖水含量如何,来自三湖泊的轮虫姐妹种Ⅰ均具有较高的种群增长率(0.52~0.85 d-1)和休眠卵产量(1.60~12.11 ind./(4 d.5 ml)),这为轮虫的扩散、种群的建立和种群间的基因交流提供了可能.汀棠湖轮虫姐妹种Ⅱ种群中的混交雌体数/非混交雌体数和休眠卵产量均极低,对照组中的混交雌体数/非混交雌体数和休眠卵产量均为0,这是存在于汀棠湖和凤鸣湖中的轮虫姐妹种Ⅱ无法通过扩散而出现在灰湖中的主要原因.澄清灰湖水的含量仅对汀棠湖中两轮虫姐妹种的种群增长率具有显著的影响.各浓度的澄清灰湖水使轮虫姐妹种Ⅰ的种群增长率显著高于对照组,60%、80%和100%的澄清灰湖水使轮虫姐妹种Ⅱ的种群增长率显著高于对照组,这表明粉煤灰污染导致已报道的相关水体中轮虫种群密度的下降并非由于其中所含的污染物(较高浓度的碱性氧化物、硫化物和金属元素等)和水体pH值的改变等对轮虫的直接毒性作用.
关键词:  粉煤灰污染  萼花臂尾轮虫  种复合体  生殖  空间分布
DOI:10.18307/2012.0119
分类号:
基金项目:国家自然科学基金项目(30770352、30499341);安徽省优秀青年基金项目(08040106904);安徽省高校生物环境与生态安全省级重点实验室专项基金项目(2004sys003);重要生物资源保护和利用研究安徽省重点实验室专项基金项目联合资助
Impact on spatial distribution of Brachionus calyciflorus species complex by coal ash pollution
XUE Yinghao, XI Yilong, ZHANG Gen
College of Life Sciences, Anhui Normal University, Provincial Key Laboratory of Biotic Environment and Ecological Safety in Anhui, Wuhu 241000, P. R. China
Abstract:
In order to analyze the ecological mechanism and the effect of coal ash pollution on distribution of Brachionus calyciflorus species complex in three lakes (Lake Hui, Lake Tingtang and Lake Fengming), the effects of aerated tap-water (control), and 20%, 40%, 60%, 80% and 100% volume fractions of settled coal ash water diluted by aerated tap-water on population growth rates, ratios mictic females/amictic females, ovigerous females/non-ovigerous females, and resting egg productions of sibling species I have been collected from Lake Hui, Lake Tingtang and Lake Fengming and sibling species Ⅱ have been collected from Lake Tingtang. The results showed that regardless of the volume fraction of settled coal ash water, sibling species I collected from all the three lakes had higher population growth rates (0.52 0.85 d-1) and resting egg productions (1.60 12.11 ind./(4 d·5 ml)) which made possible for population spread, population establishment and gene flow. Sibling species Ⅱ collected from Lake Tingtang had much lower ratio mictic females/amictic females and resting egg production, and in the aerated tap-water, both of them were zero, which might be the main reason for that sibling species Ⅱ living in Lake Tingtang and Lake Fengming could not spread into Lake Hui. The volume fraction of settled coal ash water significantly affects only the population growth rates of both two sibling species collected from Lake Tingtang. All the volume fractions of settled coal ash water made the population growth rate of sibling species I higher than that in the control, and 60%, 80% and 100% settled coal ash water made the population growth rate of sibling species Ⅱ higher than that in the control, which indicated that the decreased rotifer density in natural water bodies polluted by coal ash did not attribute to the direct toxicity of elevated metal, salt concentrations, and pH level.
Key words:  Coal ash pollution  Brachionus calyciflorus  species complex  reproduction  spatial distribution
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