| 引用本文: | 杨雅兰,尹成杰,公莉,何万朝,过龙根.上、下行效应对洱海浮游植物优势功能群的影响.湖泊科学,2023,35(4):1194-1202. DOI:10.18307/2023.0413 |
| Yang Yalan,Yin Chenjie,Gong Li,He Wanchao,Guo Longgen.Bottom-up and top-down effects on codetermination of the dominant phytoplankton functional groups in Lake Erhai. J. Lake Sci.2023,35(4):1194-1202. DOI:10.18307/2023.0413 |
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| 上、下行效应对洱海浮游植物优势功能群的影响 |
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杨雅兰1,2, 尹成杰1,2, 公莉1,2, 何万朝1,2, 过龙根1,2
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1.中国科学院水生生物研究所, 武汉 430072;2.中国科学院大学, 北京 100049
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| 摘要: |
| 浮游动物牧食、水温及营养可利用性均可影响优势浮游植物功能群的转变,但这些驱动因素的交互作用尚不清楚。为了解云南高原湖泊--洱海浮游植物优势功能群的分布特征及其主要驱动因素,于2018年1月-2020年12月进行月度采样,结合聚类分析、方差分析和冗余分析等,分析驱动浮游植物优势功能群转变的主要因素。结果表明,共鉴定浮游植物7门96属,划分为27个浮游植物功能群,其中优势功能群有15个。聚类分析结果表明,根据浮游植物功能群密度数据可将优势功能群转变过程分为3个由不同类型藻类主导的时期(S期、M期和P期),其中S期(为期18个月)以功能群S1和H1(代表藻为假鱼腥藻、浮丝藻和长孢藻等丝状蓝藻)为主,M期(为期10个月)以功能群M(微囊藻群体)为主,P期(为期8个月)以功能群P和M(脆杆藻和单个微囊藻等)为主。RDA分析及变差分解分析结果表明,卡尔森营养状态指数(TSI)(主要是总磷)是影响以丝状藻类为主的浮游植物功能群的主要驱动因素,TSI和水温是影响以微囊藻为主的浮游植物功能群的重要驱动因素。因此,在富营养化初期湖泊中,降低湖泊营养负荷是首要任务。同时可以考虑增加浮游动物丰度的策略,以增强浮游动物在削减丝状蓝藻或微囊藻生物量(下行效应)中的作用和重要性。 |
| 关键词: 洱海 浮游植物功能群 上行效应 下行效应 富营养化 |
| DOI：10.18307/2023.0413 |
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| 基金项目:云南省大理市洱海保护治理项目资助。 |
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| Bottom-up and top-down effects on codetermination of the dominant phytoplankton functional groups in Lake Erhai |
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Yang Yalan1,2, Yin Chenjie1,2, Gong Li1,2, He Wanchao1,2, Guo Longgen1,2
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1.Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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| Abstract: |
| The shift of dominant phytoplankton functional groups (FGs) can be driven by zooplankton grazing, water temperature and nutrient availability, but the interactive effects of these driving factors are not well understood. To understand the characteristics of the dominant phytoplankton FGs and their major driving factors in Lake Erhai, a subtropical highland lake in China, monthly sampling was conducted from January 2018 to December 2020. The main factors driving the shift of dominant phytoplankton FGs were analyzed by combining cluster analysis, variance partitioning analysis and redundancy analysis, respectively. In this study, 7 phytoplankton families and 96 genera were identified and divided into 27 FGs, among which 15 dominant FGs were identified. The results of cluster analysis showed that the FGs abundance could be classified into three periods (S, M and P Periods) dominated by different types of phytoplankton. S Period (which contained 18 months) was dominated by FGs S1 and H1 (representative species were filamentous cyanobacteria such as Pseudanabaena sp., Planktothrix sp., and Dolichospermum sp.). While FGs M (representative species were Microcystis colonies) was a high dominance of M Period (which contained 10 months), and FGs P and M (representative species were Fragilaria sp. and individual Microcystis, respectively) were the dominant FGs during P Period (which contained 8 months). Our results also confirmed that Carlson trophic state index (TSI) (mainly total phosphorus) were the major drivers affecting the predominant FGs of filamentous algae in the studied lakes, while TSI and water temperature were significant drivers affecting the FGs dominated by Microcystis sp.. Therefore, the top priority for lakes experiencing early eutrophication is to reduce lake nutrient loading. And strategies aimed at increasing zooplankton abundance could be considered to enhance the role and importance of zooplankton in the biomanipulation (top-down effects) of filamentous algae or Microcystis blooms. |
| Key words: Lake Erhai phytoplankton functional groups bottom-up effect top-down effect eutrophication |
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