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引用本文:温展明,顾杨亮,林秋奇,韩博平.广东流溪河水库异尾轮属(Trichocerca)的分布模式及其影响因素.湖泊科学,2017,29(2):458-466. DOI:10.18307/2017.0222
WEN Zhanming,GU Yangliang,LIN Qiuqi,HAN Boping.Distribution pattern of Trichocerca and its ecological driving variables in Liuxihe Reservoir, Guangdong Province. J. Lake Sci.2017,29(2):458-466. DOI:10.18307/2017.0222
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广东流溪河水库异尾轮属(Trichocerca)的分布模式及其影响因素
温展明, 顾杨亮, 林秋奇, 韩博平
暨南大学生态学系, 广州 510632
摘要:
异尾轮虫是热带亚热带地区轮虫的重要优势类群.为了解其在水库中的分布模式和潜在影响因素,于20132014年对广东流溪河水库河流区、过渡区及湖泊区的异尾轮虫群落及环境因子进行逐月调查.2年共采集到异尾轮虫11种,其中对棘异尾轮虫(Trichocerca similis)、圆筒异尾轮虫(T. cylindrica)、暗小异尾轮虫(T. pusilla)和刺盖异尾轮虫(T. capucina)为优势种,主要出现在丰水期,具有明显的季节分布模式.20132014年河流区、过渡区和湖泊区异尾轮虫丰度平均值分别为142.9、102.5和53.6 ind./L,3个水域的异尾轮虫总丰度在夏季(59月)较高.从水库上游到下游,异尾轮属的物种丰富度和Simpson多样性指数呈现递减趋势,体现了群落对环境的分区和稳定性变化的响应.群落丰度组成的主成分分析表明,主要优势种的丰度全年分布差异较大,而多数种类全年分布差异小.冗余分析表明,叶绿素a浓度、晶囊轮虫丰度、水温+磷酸盐浓度分别为影响河流区、过渡区和湖泊区异尾轮虫群落结构的关键变量,而降雨则是影响整个库区异尾轮虫群落结构的潜在变量.
关键词:  异尾轮属  群落结构  丰度  多样性  流溪河水库
DOI:10.18307/2017.0222
分类号:
基金项目:广东省水利科技创新项目(2012-10)和广东省科技计划项目(2013B080500022)联合资助.
Distribution pattern of Trichocerca and its ecological driving variables in Liuxihe Reservoir, Guangdong Province
WEN Zhanming, GU Yangliang, LIN Qiuqi, HAN Boping
Department of Ecology, Jinan University, Guangzhou 510632, P. R. China
Abstract:
The Trichocerca is an important and dominant species of rotifers in tropical-subtropical regions. To understand its spatial distribution in reservoirs and potential driving factors, Trichocerca assemblages were investigated monthly in riverine zone, transition zone and lacustrine zone of the Liuxihe Reservoir (Guangdong, South China) over the period of January, 2013 to December, 2014. In total, eleven species were observed in the genus. Trichocerca similis, T. cylindrica, T. pusilla and T. capucina were dominant species which have clear seasonal characteristics in wet seasons. Two-year mean total abundance was 142.9, 102.5 and 53.6 ind./L in riverine zone, transition zone and lacustrine zone, respectively, and the averaged abundances of three zones are higher in summer (May-September). The species richness and Simpson index decreased from upstream to downstream of the reservoir. The longitudinal gradient reflects the rotifer responses to change in environmental stability. Principle component analysis showed a significant tempo-spatial variation of the dominant species. Redundancy analysis demonstrated that chlorophyll-a concentration, Asplanchna abundance (a predator), and temperature+PO43--P were the critical variables influencing the structure of Trichocerca assemblage in the riverine zone, transition zone and lacustrine zone, respectively. Precipitation was the potential variable influencing the structure of Trichocerca assemblage in all three zones of the reservoir.
Key words:  Trichocerca  assemblage structure  abundance  diversity  Liuxihe Reservoir
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