2004年春季长江口海域甲藻孢囊的分布研究

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Abstract

The sediments of 10 sites(E 122°~123°30',N 29°~32°) about 15cm in length were collected from Changjiang River Estuary during April, 2004 to investigate the horizontal and vertical distribution of dinoflagellate cysts in this area. Twenty-four dinoflagellate species were identified in the sediments from 30 samples of which 13 heterotrophic protoperidinium cysts dominated in the cyst assemblages with the average concentration of 157 cysts·g^-1 DW. Two Paralytic Shellfish Poisoning(PSP) producing toxic species, Alexandrium tamarense(Lebour) Balech and Gymnodinium catenatum Graham were found, which distributed in a large range but the concentration was low. Cyst species richness in each sample varied from 11 to 18, and the concentrations rage from 189~846 cysts·g^-1 DW. The highest cysts concentration was obtained at D6, a site which is far from estuary, and the lowest was D1 that located in the northernmost. Compared with other sea areas, the cysts concentration of Changjiang River Estuary was low. The value of Shannon-Weaver diversity index(H')varied between 2.57~3.27, which had a high relative index with the concentration of the cysts, negatively r=-0.72. Results of vertical distribution of dinoflagellate cysts showed that cysts concentration from three different depth of sediment layers were 351 cysts·g^-1 DW、412 cysts·g^-1 DW、432 cysts·g^-1 DW, and the values of Shannon-Weaver diversity index were 3.22、2.95、2.98.

Key words： Dinoflagellate cysts Changjiang River Estuary Red tide

Received: 25 April 2006

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	WANG Yan
	TENG Lin

Cite this article:

WANG Yan,TENG Lin. Distribution of dinoflagellate cysts from Changjiang River Estuary in the spring of 2004[J]. , 2006, 25(2): 131-134.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2006/V25/I2/131

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