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汉阳水网中5个连通湖泊的原生动物群落结构与物种多样性

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为了解汉阳水网中的原生动物群落结构与物种多样性特征及其影响因子,探讨原生动物对湖泊富营养化的响应规律,于2021~2022年对水网中5个湖泊的水环境及原生动物进行了 4个季节的调查分析.结果表明,后官湖为轻度富营养,三角湖和南太子湖为中度富营养,墨水湖和龙阳湖为重度富营养.共检出原生动物31属59种,其中后官湖种类最少,有21种,龙阳湖和墨水湖种类较多,分别有41种、40种.原生动物年均密度的变化范围为123.37~579.47 ind./L,Shannon-Wiener指数和Margalef指数年均值的变化范围分别为0.75~1.73、0.47~1.32.从季节看,秋季原生动物的密度和多样性较高;从空间看,后官湖原生动物的密度和多样性较低.多元逐步回归分析显示,叶绿素a(chl a)和轮虫密度是影响原生动物种类数、密度及多样性指数的主要因子.典范对应分析(CCA)和冗余分析(RDA)表明,水温(WT)、枝角类密度、浮游植物密度、透明度(SD)、chl a、总氮(TN)等是驱动原生动物群落结构变化的重要因子.分段线性回归模型显示,原生动物的种类数、密度和Margalef指数能较好地反映湖泊富营养化的发展规律,当44≤综合营养状态指数(TLI(Σ))≤77时,各参数随着TLI(Σ)增大先增加后下降,峰值出现在TLI(Σ)为70左右.
COMMUNITY STRUCTURE AND SPECIES DIVERSITY OF PROTOZOA IN FIVE INTERCONNECTED LAKES IN HANYANG
To investigate the community structure,species diversity,and influencing factors on protozoa in five interconnected lakes(Houguan,Sanjiao,Nantaizi,Moshui,and Longyang Lakes)of Changjiang(Yangtze)River networks in Hanyang,Hubei,China,as well as their response to eutrophication,this study was conducted seasonally from 2021 to 2022.Results show that the eutrophication levels of the five lakes were different.Houguan Lake had mild eutrophication level,Sanjiao Lake and Nantaizi Lake had moderate eutrophication level,and Moshui Lake and Longyang Lake had severe eutrophication level.In the five lakes,59 protozoa species from 31 genera were identified,among which Houguan Lake had the least species(21 species),while Longyang Lake(41 species)and Moshui Lake(40 species)had most species.The mean annual density of protozoa ranged from 123.37 to 579.47 ind./L,while the mean annual Shannon-Wiener index and Margalef index were 0.75~1.73 and 0.47~1.32,respectively.The density and diversity of protozoa were the highest in autumn,and the lowest in Houguan Lake in space.Multiple stepped-regression analysis showed that chlorophyll a and rotifer density were the main factors affecting the species number,density and diversity index of protozoa.Canonical correspondence analysis and redundancy analysis showed that water temperature(WT),cladocera density,phytoplankton density,transparency(SD),chlorophyll a(chl a),and total nitrogen(TN)were important factors driving the changes of protozoa community structure.The piecewise linear regression model showed that the species number,density and Margalef index of protozoa could better reflect the development law of lake eutrophication.When 44≤TLI(Σ)≤77,the parameters increased first and then decreased with the increase of TLI(Σ),and the peak value occurred when the TLI(Σ)was about 70.The connectivity among lakes improved the overall eutrophic status of the water network,but the diversity of protozoa was still not high.Further governance of lakes and rivers is needed,while controlling pollution sources,gradually improving the ecological environment,and enhancing biodiversity.

protozoacommunity structurespecies diversityeutrophication

熊雪平、翟东东、刘红艳、陈元元、熊飞

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江汉大学生命科学学院 湖北省汉江流域特色生物资源保护开发与利用工程技术研究中心 湖北武汉 430056

江汉大学持久性有毒污染物环境与健康危害湖北省重点实验室 湖北武汉 430056

原生动物 群落结构 物种多样性 富营养化

2024

海洋与湖沼
中国海洋湖沼学会 中国科学院海洋研究所

海洋与湖沼

CSTPCD北大核心
影响因子:0.737
ISSN:0029-814X
年,卷(期):2024.55(6)