Distribution features of chlorophyll a and primary productivity in high frequency area of red tide in East China Sea during Spring

Abstract

Abstract: 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 (<20μm) dominated the phytoplankton biomass in this sea region during Spring (up to 64% of total chlorophyll a content). Ultra-phytoplankton (<5μm) 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.

CLC Number:

Q175.53

ZHOU Weihua, HUO Wenyi, YUAN Xiangcheng, YIN Kedong . Distribution features of chlorophyll a and primary productivity in high frequency area of red tide in East China Sea during Spring[J]. Chinese Journal of Applied Ecology, 2003, (7): 1055-1059.

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