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引用本文:曾海逸,钟萍,赵雪枫,李超,何小林,刘正文.热带浅水湖泊后生浮游动物群落结构对生态修复的响应.湖泊科学,2016,28(1):170-177. DOI:10.18307/2016.0120
ZENG Haiyi,ZHONG Ping,ZHAO Xuefeng,LI Chao,HE Xiaolin,LIU Zhengwen.Response of metazoan zooplankton communities to ecological restoration in a tropical shallow lake. J. Lake Sci.2016,28(1):170-177. DOI:10.18307/2016.0120
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热带浅水湖泊后生浮游动物群落结构对生态修复的响应
曾海逸1, 钟萍1, 赵雪枫2, 李超2, 何小林2, 刘正文1,3
1.暨南大学生态学系与水生生物研究中心, 广州 510632;2.广州贝山环保科技有限公司, 广州 510632;3.中国科学院南京地理与湖泊研究所, 南京 210008
摘要:
热带浅水湖泊后生浮游动物群落以轮虫和小型枝角类为主,往往缺乏大型浮游动物,其影响因子还存在争议,因此通过减少鱼类,提高大型后生浮游动物密度,从而增强对浮游植物的下行控制、修复热带富营养化湖泊的方法受到质疑.暨大南湖位于广州暨南大学校园内,是热带富营养化浅水湖泊,于2014年12月实施以鱼类去除和水生植被重建为主的生态系统修复工程,以期改善水质.通过对南湖修复前后水质、后生浮游动物以及修复后鱼类群落的调查分析,研究了后生浮游动物群落对修复的响应.结果表明:与修复前相比,总氮、总磷和叶绿素a浓度显著降低,透明度显著上升.枝角类丰度和生物量显著增加,修复后初期出现较高密度的大型枝角类蚤状溞(Daphnia pulex),桡足类丰度和生物量没有显著变化,轮虫丰度下降而生物量上升;后生浮游动物体长和生物多样性显著增加.随着鱼类密度的增加,蚤状溞丰度快速降低,后期鱼类减少后蚤状溞丰度又有所升高.因此,本研究显示鱼类是控制热带浅水湖泊大型浮游动物种群的主要因素,由于控制鱼类密度以维持较高大型浮游动物密度较为困难,因此单纯生物操纵在热带浅水湖泊修复中难以取得显著效果.
关键词:  热带浅水湖泊  后生浮游动物  生态修复  鱼类  群落结构
DOI:10.18307/2016.0120
分类号:
基金项目:国家重点基础研究发展计划"973"项目(2012CB956100)资助.
Response of metazoan zooplankton communities to ecological restoration in a tropical shallow lake
ZENG Haiyi1, ZHONG Ping1, ZHAO Xuefeng2, LI Chao2, HE Xiaolin2, LIU Zhengwen1,3
1.Department of Ecology and Institute of Hydrobiology, Jinan University, Guangzhou 510632, P. R. China;2.Belsun Environmental Protection, Guangzhou 510632, P. R. China;3.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
Abstract:
The metazoan zooplankton communities were dominated by small cladocerans and rotifers, often lack of large-sized zooplankton in tropical lakes and the controlling factors are not clear. Thus it has been questioned if eutrophic lakes can be restored by reducing fish, increasing large-sized metazoan zooplankton, and the top-down control on phytoplankton in the tropics. South Lake from Jinan University, Guangzhou, is a tropic eutrophic shallow lake. The lake was restored via fish removal and plantation of submerged macrophytes in order to improve water quality. We monitored the water quality, metazoan zooplankton communities and fish before and after restoration in order to study the response of metazoan zooplankton communities to the restoration. The results showed that total nitrogen, total phosphorus and chlorophyll-a concentrations decreased significantly and the transparency increased. The abundance and biomass of cladoceran increased, and high numbers of large-sized cladoceran Daphnia pulex were observed shortly after the restoration. The abundance and biomass of copepods had no significant changes. The density of rotifers decreased,but biomass increased. The sizes of metazoan zooplankton and biodiversity increased. The abundance of Daphnia pulex decreased quickly when fish biomass increased, and increased again when fish biomass was reduced later. Therefore, this study suggests that fish is a key factor controlling the population of large-sized zooplankton in tropical shallow lakes. As controlling fish to maintain high densities of large-sized zooplankton is difficult, it is unlikely to achieve a significant improvement in the restoration of tropical lakes using only biomanipulation.
Key words:  Tropical shallow lake  metazoan zooplankton  ecological restoration  fish  community structure
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