Patterns of asynchrony for phytoplankton fluctuations from reservoir mainstream to a tributary bay in a giant dendritic reservoir (Three Gorges Reservoir, China) |
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| Authors: | Yaoyang Xu Qinghua Cai Meiling Shao Xinqin Han |
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| Institution: | (1) State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, Hubei, People’s Republic of China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China |
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| Abstract: | 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 limnology. 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 phytoplankton 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 phytoplankton 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. |
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