[Distribution features of chlorophyll a and primary productivity in high frequency area of red tide in East China Sea during spring].
The distributions of chlorophyll a and primary productivity were determined during April to May 2002 in the East China Sea. The results showed that the average concentration of chlorophyll a was 1.086 mg.m-3 at surface layer, and that nano- and pico-phytoplankton (< 20 microns) dominated the phytoplankton biomass in this sea region during Spring (up to 64% of total chlorophyll a content). Ultra-phytoplankton (< 5 microns) consisted 27% of total phytoplankton biomass. Nutrients and feeding pressure of zooplankton affected the distribution of chlorophyll a and its size-fractionation. The average primary productivity was 10.091 mg.m-3.h-1, while that of red tide tracking stations R-03, RL-01 and RG-01 was 399.984 mg.m-3.h-1. Light and nutrients were the main factors affecting the distributions of chlorophyll a and primary productivity. The station DC-11 had a high concentration of phytoplankton biomass. The surface layer concentration of chlorophyll a and primary productivity were up to 9,082 mg.m-3 and 128,79 mg.m-3.h-1, respectively, but the color of the seawater was normal.
Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanonology, Chinese Academy of Sciences, Guangzhou 510301, China. whzhou@scsio.ac.cn
Weihua
W
Zhou
Wenyi
W
Huo
Xiangcheng
X
Yuan
Kedong
K
Yin
D000818:Animals; D018533:Biomass; D002681:China; D002734:Chlorophyll / Q000032:analysis*; D000077194:Chlorophyll A; D017753:Ecosystem; D057097:Harmful Algal Bloom; D009792:Oceans and Seas; D010839:Phytoplankton; D012621:Seasons; D012623:Seawater / Q000737:chemistry; D015048:Zooplankton
D002734:Chlorophyll; D000077194:Chlorophyll A