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引用本文:陈旭繁,黄珂,章洁香,黄琦,刘平,韩博平.中国南亚热带水库敞水区春季轮虫群落结构:基于分类特征和功能性状的分析.湖泊科学,2021,33(5):1490-1499. DOI:10.18307/2021.0517
Chen Xufan,Huang Ke,Zhang Jiexiang,Huang Qi,Liu Ping,Han Boping.Spring community structure of pelagic rotifers in (sub)tropical reservoirs of China: Taxonomic and functional trait-based analysis*. J. Lake Sci.2021,33(5):1490-1499. DOI:10.18307/2021.0517
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中国南亚热带水库敞水区春季轮虫群落结构:基于分类特征和功能性状的分析
陈旭繁, 黄珂, 章洁香, 黄琦, 刘平, 韩博平
暨南大学生态学系, 广州 510632
摘要:
轮虫是淡水后生浮游动物中种类最丰富的类群,是水体生态系统食物链的关键环节.很多种类的轮虫对环境变化敏感,环境条件的改变能够导致其群落结构的快速变化,因此,轮虫群落的组成与变化可从生态位角度得以解释.物种的功能性状可提供更强的生态适应性信号,轮虫的个体大小是反映其代谢与行为的综合性状,而咀嚼器、防御结构及防御行为则反映了它们对食物利用和应对捕食等方面的功能性状,轮虫群落中物种的这些功能性状组成反映了食物资源和捕食压力等对群落组成的选择作用.为了解我国南亚热带水库轮虫群落的结构特征,于2018年春季(3-5月)采集了我国华南地区43座水库敞水区的浮游动物定性样品和定量样品,同时测定了水温、水深、水体透明度及叶绿素a浓度等指标.共采集到轮虫19属45种,主要为营浮游生活的种类,异尾轮属(Trichocerca)和臂尾轮属(Brachionus)的种类最多,分别有10和7种.在轮虫个体大小上,群落中体长≤150 μm个体的丰度和生物量均占绝对优势(分别为83.11%和53.10%),体现出热带、亚热带地区轮虫群落以小个体种类占优势的一般特征;具有槌型咀嚼器、杖型咀嚼器的轮虫为优势咀嚼器功能群,分别占57.78%和33.14%;具背甲与棘刺的轮虫为主要优势防御结构功能群(66.59%).南亚热带水库春季轮虫群落在食物利用及应对捕食压力上的特点明显,冗余分析表明轮虫群落的种类组成及性状功能群的丰度组成显著地受到食物、温度及竞争的影响.
关键词:  群落结构  功能性状  咀嚼器  轮虫  南亚热带水库
DOI:10.18307/2021.0517
分类号:
基金项目:国家自然科学基金项目(31670460)和广州市科技计划项目(2016A030313098)联合资助.
Spring community structure of pelagic rotifers in (sub)tropical reservoirs of China: Taxonomic and functional trait-based analysis*
Chen Xufan, Huang Ke, Zhang Jiexiang, Huang Qi, Liu Ping, Han Boping
Department of Ecology, Jinan University, Guangzhou 510632, P. R. China
Abstract:
Rotifers, the most diverse group of zooplankton in freshwater ecosystems, play an important role in structuring food webs. As many rotifers are sensitive to environmental changes, their communities change rapidly with alternated environments and are well understood from a niche perspective. The functional traits of species generally provide more information on ecological adaptation in the community assembly. Among functional traits of rotifers, body size, trophi, defensing structure and defensive behaviors indicate rotifers' abilities to use food and coping with their predators. To understand the structure and assembly of rotifer communities in (sub)tropical reservoirs in spring when both food and predation pressure increase, we investigated the pelagic rotifers of 43 reservoirs in southern China from March to May of 2018. Physicochemical variables of water bodies were measured, including water temperature, water depth, water transparency and chlorophyll-a concentration. A total of 45 species were identified from all the pelagic samples, and most species were from Trichocerca (10 species) and Brachionus (7 species). Rotifer communities were dominated by small-sized species (83.11% in total abundance and 53.10% in total biomass). Rotifers with trophi of malleate and virgate dominated in all the trophi types (≥ 90%), while those species with lorica and spine (66.59%) dominated for defensive structure. Such a pattern for species composition and functional structure demonstrates adaptation of rotifers in warmer waters with high temperature and high predation pressure. Redundancy analysis showed that food resource, water temperature and competition are the main factors structuring significantly the rotifers communities in our investigated reservoirs.
Key words:  Community structure  functional trait  trophi  rotifer  (sub) tropical reservoirs
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