Long-term plankton community dynamics and influencing factors in a man-made shallow lake, Lake Dishui, China
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Aquatic Sciences
RESEARCH ARTICLE
Long‑term plankton community dynamics and influencing factors in a man‑made shallow lake, Lake Dishui, China Kun Zhao1 · Yue Cao1 · Wanting Pang1 · Lizhu Wang2 · Kun Song3 · Qingmin You1 · Quanxi Wang1 Received: 5 November 2019 / Accepted: 24 September 2020 © Springer Nature Switzerland AG 2020
Abstract Understanding how long-term environmental variation and biotic interaction determine biological assemblages is critical for evaluating the response of biological communities to anthropogenic and climate changes. We sampled plankton and water quality from a man-made lake monthly from 2006 to 2015 for the period from after creation to 13-year old of the lake. We used correlation, variation partitioning, multivariate autoregressive state-space models, and dynamic factor analyses to disentangle interactions of biotic and abiotic factors in regulating the dynamics of plankton size groups. We found that annual average total abundances decreased 86% for phytoplankton and 78% for zooplankton, while concentrations increased 1.8 times for total nitrogen and 2.7 times for total phosphorus during the study period. We concluded that the decline of plankton abundance was largely attributed to the predation of zooplankton on phytoplankton, fish predation on both phytoplankton and zooplankton, and linkages with the decline of water salinity, pH, and the increase of clarity. The decline of plankton abundance was apparently not resulted from long-term change in nutrient concentrations. These conclusions were further supported by that abundances of nano-phytoplankton and micro-phytoplankton oscillated in opposite direction with extremely low density of Cladocera (
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