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| Estuarine nutrient loading affects phytoplankton growth and microzooplankton grazing at two contrasting sites in Hong Kong coastal waters | |
| Chen, Bingzhang1; Liu, Hongbin1,2; Landry, Michael R.3; Chen, Mianrun2; Sun, Jun4; Shek, Loklun1; Chen, Xihan1; Harrison, Paul J.1 | |
| 2009 | |
| 发表期刊 | MARINE ECOLOGY PROGRESS SERIES
 |
| ISSN | 0171-8630 |
| 卷号 | 379页码:77-90 |
| 文章类型 | Article |
| 摘要 | To investigate the effects of enhanced nutrient loading in estuarine waters on phytoplankton growth and microzooplankton grazing, we conducted monthly dilution experiments at 2 stations in Hong Kong coastal waters with contrasting trophic conditions. The western estuarine station (WE) near the Pearl River estuary is strongly influenced by freshwater discharge, while the eastern oceanic station (EO) is mostly affected by the South China Sea. Growth rates of phytoplankton were often limited by nutrients at EO, while nutrient limitation of phytoplankton growth seldom Occurred at WE due to the high level of nutrients delivered by the Pearl River, especially in the summer rainy season. Higher chlorophyll a, microzooplankton biomass, phytoplankton growth and microzooplankton grazing rates were found at WE than at EO. However, the increase in chlorophyll greatly exceeded the increase in phytoplankton growth rate, reflecting different response relationships to nutrient availability. Strong seasonality was observed at both stations, with temperature being an important factor affecting both phytoplankton growth and microzooplankton grazing rates. Picophytoplankton, especially Synechococcus, also exhibited great seasonality at EO, with summer abundances being 2 or 3 orders of magnitude higher than those during winter, Our results confirm that in eutrophic coastal environments, microzooplankton grazing is a dominant loss pathway for phytoplankton, accounting for the utilization of >50%, of primary production on average.; To investigate the effects of enhanced nutrient loading in estuarine waters on phytoplankton growth and microzooplankton grazing, we conducted monthly dilution experiments at 2 stations in Hong Kong coastal waters with contrasting trophic conditions. The western estuarine station (WE) near the Pearl River estuary is strongly influenced by freshwater discharge, while the eastern oceanic station (EO) is mostly affected by the South China Sea. Growth rates of phytoplankton were often limited by nutrients at EO, while nutrient limitation of phytoplankton growth seldom Occurred at WE due to the high level of nutrients delivered by the Pearl River, especially in the summer rainy season. Higher chlorophyll a, microzooplankton biomass, phytoplankton growth and microzooplankton grazing rates were found at WE than at EO. However, the increase in chlorophyll greatly exceeded the increase in phytoplankton growth rate, reflecting different response relationships to nutrient availability. Strong seasonality was observed at both stations, with temperature being an important factor affecting both phytoplankton growth and microzooplankton grazing rates. Picophytoplankton, especially Synechococcus, also exhibited great seasonality at EO, with summer abundances being 2 or 3 orders of magnitude higher than those during winter, Our results confirm that in eutrophic coastal environments, microzooplankton grazing is a dominant loss pathway for phytoplankton, accounting for the utilization of >50%, of primary production on average. |
| 关键词 | Phytoplankton Microzooplankton Grazing Rates Pearl River Estuary Picoplankton |
| 学科领域 | Ecology ; Marine & Freshwater Biology ; Oceanography |
| DOI | 10.3354/meps07888 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000265625200007 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/2600 |
| 专题 | 海洋生态与环境科学重点实验室 |
| 作者单位 | 1.Hong Kong Univ Sci & Technol, AMCE Program, Hong Kong, Hong Kong, Peoples R China 2.Hong Kong Univ Sci & Technol, Dept Biol, Hong Kong, Hong Kong, Peoples R China 3.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA 4.Chinese Acad Sci, Key Lab Marine Ecol & Environm Sci, Inst Oceanol, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Bingzhang,Liu, Hongbin,Landry, Michael R.,et al. Estuarine nutrient loading affects phytoplankton growth and microzooplankton grazing at two contrasting sites in Hong Kong coastal waters[J]. MARINE ECOLOGY PROGRESS SERIES,2009,379:77-90. |
| APA | Chen, Bingzhang.,Liu, Hongbin.,Landry, Michael R..,Chen, Mianrun.,Sun, Jun.,...&Harrison, Paul J..(2009).Estuarine nutrient loading affects phytoplankton growth and microzooplankton grazing at two contrasting sites in Hong Kong coastal waters.MARINE ECOLOGY PROGRESS SERIES,379,77-90. |
| MLA | Chen, Bingzhang,et al."Estuarine nutrient loading affects phytoplankton growth and microzooplankton grazing at two contrasting sites in Hong Kong coastal waters".MARINE ECOLOGY PROGRESS SERIES 379(2009):77-90. |
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