Impact of microzooplankton and Calanus sinicus（Brodsky,1962） on phytoplankton in the Yellow Sea during early summer

• Published in: Chinese journal of oceanology and limnology Vol. 28; no. 4; pp. 881 - 886
• Main Author: 于莹 张武昌 肖天 李洪波 李超伦 孙松
• Format: Journal Article
• Language: English
• Published: 2010
• Subjects: 中华哲水蚤; 叶绿素a; 微型浮游动物; 浮游植物; 食草动物
• ISSN: 0254-4059; 1993-5005

Dilution incubations and Calanus sinicus addition incubations were simultaneously conducted at five stations in the Yellow Sea in June of 2004 to evaluate the impact of microzooplankton and Calanus sinicus on phytoplankton based on the Chlorophyll a（Chl-a） levels.The Chl-a growth rates（k） ranged from 0.60-1.67 d^-1,while microzooplankton grazed the Chl-a at rates（g） of 0.29-0.62 d^-1.The addition of C.sinicus enhanced the Chl-a growth rate（Z） by 0.004-0.037 d^-1 ind.^-1 L.C.sinicus abundance ranged from 84.1-160.9 ind.m^-3,which occupied 90.7%-99.1% of the copepod（〉500 μm） population.The in-situ increase in phytoplankton by C.sinicus community was estimated to be 0.000 4-0.005 9 d^-1.These results showed that microzooplankton were the main grazers of phytoplankton,while C.sinicus induced a slight increase in the levels of phytoplankton.