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Bacterioplankton dynamics along the gradient from highly eutrophic Pearl River Estuary to oligotrophic northern South China Sea in wet season: implication for anthropogenic inputs |
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| Authors: | Zhou Weihua Long Aimin Jiang Tao Chen Shaoyong Huang Liangmin Huang Hui Cai Chuanghua Yan Yan |
| Institution: | a Key Laboratory of Marine Bio-resources Sustainable Utilization (LMB), Key Laboratory of Tropical Marine Environmental Dynamics (LED) and Tropical Marine Biological Research Station in Hainan, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China b Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China c Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
| Abstract: | Bacterioplankton abundance (BA) and biomass (BB) from the eutrophic Pearl River Estuary (PRE) to the oligotrophic northern South China Sea (NSCS) were studied in the wet season. BA was significantly higher (p < 0.05) in PRE (12.51 ± 3.52 × 108 cells L−1), than in the continental shelf neritic province (CSNP, 4.95 ± 2.21 × 108 cells L−1) and in the deep oceanic province (OP, 3.16 ± 1.56 × 108 cells L−1). Nutrient-replete PRE waters (DIN > 100 μM and PO4 > 1 μM) resulted in high chl a and BB, whereas nutrient-depleted offshore waters (DIN <5 μM and PO4 < 0.5 μM) had low biomass. Temperature (>26 °C) was not the controlling factor of BA. BB was significantly correlated with chl a biomass both in PRE and NSCS. The bacteria to phytoplankton biomass (BB/PB) ratio increased clearly along the gradient from near-shore PRE (0.15) to offshore CSNP (0.93) and deep OP (2.75), indicating the important role of small cells in the open ocean compared to estuarine and coastal zones. |
| Keywords: | Bacterioplankton Chlorophyll a Temperature Eutrophication Pearl River Estuary Northern South China Sea |
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