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Patterns of asynchrony for phytoplankton fluctuations from reservoir mainstream to a tributary bay in a giant dendritic reservoir (Three Gorges Reservoir, China)

机译：巨型树状水库（中国三峡水库）中从水库主流到支流湾的浮游植物波动的异步模式

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摘要

Seasonal fluctuations of phytoplankton have often been regarded as one of the important cyclic events in aquatic ecosystems, and have even been emphasized as an important sign of regional climatic variability in limnol ogy. However, few attempts have been made to examine synchrony for phytoplankton fluctuations among different habitats in a single reservoir system. The present study employed Spearman rank correlation analysis and the Mantel test to assess levels of synchrony for phytoplankton abundance and taxonomic composition from reservoir mainstream to a tributary bay (Xiangxi Bay) in a giant dendritic reservoir, China (Three Gorges Reservoir, TGR). At the selected scale, asynchronous patterns of phyto plankton were found when looking at total abundance and taxonomic composition, suggesting that regional drivers were not strong enough to synchronize phytoplankton fluctuations, and local regulators were predominant. As a riverine system, the mainstream of TGR had high levels of algal synchrony, while asynchronous patterns of phyto plankton were detected within Xiangxi Bay, which is characterized as a lacustrine system. The present study further confirmed that external hydrological disturbances strongly homogenize habitat conditions and synchronize phytoplankton fluctuations within the mainstream, while spatial divergence of phytoplankton succession depend on local habitat conditions within Xiangxi Bay. Moreover, low synchrony of phytoplankton between the mainstream and Xiangxi Bay is probably caused by spatial divergence of phytoplankton succession within Xiangxi Bay and the lack of succession in the rapidly flushed mainstream. Independently of these mechanisms possibly explaining phytoplankton fluctuations, the present study has also an applied perspective to the improvement of a long-term observation program in which phytoplankton trends at the mainstream scale could be compiled from the data set in a single site, while a set of sampling sites should be required at the Xiangxi Bay scale.
机译：浮游植物的季节性波动通常被认为是水生生态系统中重要的周期性事件之一，甚至被强调为石灰石区域气候变化的重要标志。但是，很少有人尝试检查单个水库系统中不同生境之间浮游植物波动的同步性。本研究采用Spearman等级相关分析和Mantel检验来评估中国大型树状水库（三峡水库，TGR）中从水库主流到支流湾（湘西湾）的浮游植物丰度和分类学组成的同步水平。在选定的尺度上，当观察总浮游生物的丰度和分类学组成时，发现了浮游植物的异步模式，这表明区域驱动力不足以同步浮游植物的波动，并且当地的监管者占主导地位。作为河流系统，TGR的主流具有较高的藻类同步性，而湘西湾则以湖相系统为特征，发现了非同步的浮游生物模式。本研究进一步证实，外部水文扰动强烈地使生境条件均匀化，并使主流内的浮游植物波动同步化，而浮游植物演替的空间差异取决于湘西湾内的当地生境条件。此外，主流与湘西湾之间的浮游植物同步性低可能是由于湘西湾内浮游植物演替的空间差异和快速冲洗的主流中缺少演替造成的。独立于这些可能解释浮游植物波动的机制，本研究还为长期观察计划的改进提供了应用前景，在该计划中，主流规模的浮游植物趋势可以从单个地点的数据集中汇编而得。湘西湾规模的采样点数量应达到要求。

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  • 来源
    《Aquatic Sciences》 |2012年第2期|p.287-300|共14页
  • 作者

    Yaoyang Xu; Qinghua Cai; Meiling Shao; Xinqin Han;

  • 作者单位

    State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology, Chinese Academy of Sciences,Wuhan 430072, Hubei, People's Republic of China,Graduate University of Chinese Academy of Sciences,Beijing 100049, People's Republic of China;

    State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology, Chinese Academy of Sciences,Wuhan 430072, Hubei, People's Republic of China;

    State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology, Chinese Academy of Sciences,Wuhan 430072, Hubei, People's Republic of China;

    State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology, Chinese Academy of Sciences,Wuhan 430072, Hubei, People's Republic of China,Graduate University of Chinese Academy of Sciences,Beijing 100049, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    total algal abundance; taxonomic composition; temporal coherence; aquatic habitat heterogeneity; dendritic reservoir;

    机译：总藻类丰度;分类组成;时间连贯;水生生境异质性;树状储层;

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