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Phytoplankton assemblage structure shaped by key environmental variables in the Pearl River Estuary, South China

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Abstract

Spatial distribution and temporal dynamics of phytoplankton community and their relationships with environmental factors were studied in the Pearl River Estuary (PRE), South China, in three seasons. Salinity was considered as the key environmental variable controlling horizontal distributions of phytoplankton community composition. A transition from dominance of freshwater diatoms (Aulacoseira granulata and A. granulata v. angustissima) to estuarine species (Skeletonema costatum and Pseudonitzschia delicatissima) was observed in the high flow season (summer) along the estuary gradient; in the low flow season (spring), the inner estuary was relatively homogeneous and some typical estuarine species could be found near the river mouth. In the normal flow season (autumn), a potentially toxic bluegreen species, Microcystis spp. was predominant in the middle reaches of the estuary, which should be seeded from upstream and transported downstream by river discharges. Phytoplankton abundance was negatively correlated with suspended solid content and nutrient concentration in the PRE, suggesting that turbidity and nutrient availability were the crucial factors regulating the algal biomass. Phytoplankton abundance in the outer estuary was enhanced by increasing irradiance and continued to be enhanced until phosphorus-limitation.

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Authors and Affiliations

  1. Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, P. R. China

    Xia Zhang, Jingping Zhang, Xiaoping Huang & Liangmin Huang

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  1. Xia Zhang
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  2. Jingping Zhang
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  3. Xiaoping Huang
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Correspondence to Xiaoping Huang.

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Zhang, X., Zhang, J., Huang, X. et al. Phytoplankton assemblage structure shaped by key environmental variables in the Pearl River Estuary, South China. J. Ocean Univ. China 13, 73–82 (2014). https://doi.org/10.1007/s11802-014-1972-3

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  • DOI: https://doi.org/10.1007/s11802-014-1972-3

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