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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
ISSN0171-8630
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
DOI10.3354/meps07888
URL查看原文
收录类别SCI
语种英语
WOS记录号WOS:000265625200007
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被引频次:60[WOS]   [WOS记录]     [WOS相关记录]
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
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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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