Abstract
Abstract The interpretation of environmental effect on phytoplankton growth is not straightforward, especially in ecosystems with high variation in hydrological conditions due to confounding variables. Lake Poyang is characterized by high fluctuation of water level (WL) due to its free connection to the Yangtze River. High frequency (weekly) and long-term (2009–2018) samplings were conducted in Lake Poyang resulting in 170 samples. Our study aimed to illustrate that whether the key factors determining phytoplankton growth change with WL. Furthermore, the impact of WL on phytoplankton was also detected. Six periods were classified in our study, i.e., dry season, raising period (I and II), wet season, and falling period (I and II) based on WL variation. Environmental characteristics were significantly (P
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