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引用本文:杨敏,毕永红,胡建林,胡征宇.三峡水库香溪河库湾春季水华期间浮游植物昼夜垂直分布与迁移.湖泊科学,2011,23(3):375-382. DOI:10.18307/2011.0309
YANG Min,BI Yonghong,HU Jianlin,HU Zhengyu.Diel vertical migration and distribution of phytoplankton during spring blooms in Xiangxi Bay, Three Gorges Reservoir. J. Lake Sci.2011,23(3):375-382. DOI:10.18307/2011.0309
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三峡水库香溪河库湾春季水华期间浮游植物昼夜垂直分布与迁移
杨敏1,2,3, 毕永红1, 胡建林1, 胡征宇1
1.中国科学院水生生物研究所淡水生态与生物技术国家重点实验室, 武汉 430072;2.中国科学院研究生院, 北京 100049;3.重庆市环境科学研究院, 重庆 401147
摘要:
三峡水库蓄水后,香溪河库湾每年春季均会暴发硅、甲藻水华.为了揭示香溪河库湾水华的暴发规律,于2008年春季对水华期间优势浮游植物的昼夜垂直分布格局及其影响因子进行了研究.利用时间深度等值图模拟浮游植物在水柱中的昼夜垂直分布格局,并用Morisita指数对其进行定量检验,采用修正的K-S test来检验浮游植物是否存在昼夜垂直迁移现象.结果表明,在甲藻水华发生的吴家湾样点,倪氏拟多甲藻(Peridiniopsis niei)、膝曲裸藻(Euglena geniculata)和具尾逗隐藻(Komma caudata)为优势种类,相对密度分别为53.47%、14.36%、21.94%.倪氏拟多甲藻具有明显的昼夜垂直迁移现象,白天主要聚集分布于水体近表层,晚间在水柱中趋于均匀分布;膝曲裸藻和具尾逗隐藻没有明显的昼夜垂直迁移活动,它们主要聚集分布于水体亚表层,但随着白天光照强度的增强均表现出一定的趋光性.在硅藻水华发生的平邑口样点,优势种类为汉斯冠盘藻(Stephanodiscus hantzschii)和塔胞藻(Phramidomonas sp.)(相对密度分别为89.53%和7.96%).汉斯冠盘藻昼夜垂直分布类型无显著差异,主要聚集分布于4m以上水体;塔胞藻具有昼夜垂直迁移现象.Sperman相关分析表明,光照强度的变化是引起倪氏拟多甲藻和塔胞藻昼夜垂直迁移行为的主要环境因素,而其他藻类的昼夜垂直分布格局与光照强度的变化无显著相关.膝曲裸藻和具尾逗隐藻的昼夜垂直分布格局可能受光照的变化及水体扰动的共同影响.汉斯冠盘藻不能自由游动,其昼夜分布格局可能主要受水体扰动的影响.
关键词:  浮游植物  垂直分布  迁移  春季水华  香溪河库湾  三峡水库
DOI:10.18307/2011.0309
分类号:
基金项目:国家重点基础研究发展计划项目(2008CB418002);国家水体污染控制与治理科技重大专项项目(2009ZX07104-005)联合资助
Diel vertical migration and distribution of phytoplankton during spring blooms in Xiangxi Bay, Three Gorges Reservoir
YANG Min1,2,3, BI Yonghong1, HU Jianlin1, HU Zhengyu1
1.State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, P. R. China;2.Graduate School of Chinese Academy of Sciences, Beijing 100049, P. R. China;3.Chongqing Academy of Environmental Sciences, Chongqing 401147, P. R. China
Abstract:
Diatoms and dinoflagellate blooms have always occurred in spring in Xiangxi Bay since the impoundment of Three Gorges Reservoir.Vertical distribution and migration of dominant phytoplankton were studied during two diel periods in Xiangxi Bay in spring 2008, which may be fundamental to understand the outbreak of bloom.In the present study, Peridiniopsis niei, Euglena geniculata and Komma caudata dominated in WJW, accounted for 53.47%, 14.36% and 21.94% of total abundunee.respec. tively.While in PYK, Stephanodiscus hantzschii and Phramidomonas sp. were dominant, and the relative abundance was 89.53% and 7.96%, respectively.Mapping method was used to describe the time-depth distribution of phytoplankton individuals.The dispersion patterns for phytoplankton population were tested with Morisita index, and a modified two sample Komogomv-Smirnov was used to test differences in vertical distribution. Both P. niei and Ph. sp.aggregated in the water upper layer in daytime and was close to a random distribution at night, performing diel vertical migration(DVM). E geniculata and K. caudata did not display DVM.They accumulated in upper water layers and showed phototaxis. S. hantzwhii inhabited the upper water layer.There was significant difference in day and night distribution.Sperman correlation analysis revealed that the diel vertical distribution of both P. niei and ph. sp. significantly correlated with Usht availability, but the other algae didn't.The vertical distribution pattern of E. geniculata and K. caudata may be influenced by dymamic of light availability and water column disturbance caused by wind.The vertical distribution of S. hantzschii which was non-motile may mainly affected by water column disturbance.
Key words:  Phytoplankmn  vertical distribution  migration  spring bloom  Xiangxi Bay  Three Gorges Reservoir
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