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Annual Change of Environmental Factors and Phytoplankton Community Characteristics in Maowei Sea of Qinzhou Bay

HE Bi-juan

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Abstract

Environmental factors,phytoplankton species composition,dominant species,amount of distribution and community structure were investigated in January,March,June and September of 2010 in Maowei Sea of Qinzhou Bay.The results showed that,in the survey area,the concentration of PO3-4-P was 0.01～0.07 mg/dm3,DIN was 0.16～0.78 mg/dm3,and both values of PO3-4-P and DIN had scaled over Type Ⅳ water quality standards at some stations.262 species belonged to 82 genera of phytoplankton were identified,and there were 16 kinds of dominant species among them.The phytoplankton abundance average was 6.29×104 cells/L,and the annual average index of biodiversity was 3.87.The species number of phytoplankton had a decreasing trend from winter to autumn.There was an obvious seasonal change in the cell abundance,being the lowest(3.28×104 cells/L) in spring(March) and highest(9.25×104 cells/L) in summer(June).

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What this paper is about

Environmental factors,phytoplankton species composition,dominant species,amount of distribution and community structure were investigated in January,March,June and September of 2010 in Maowei Sea of Qinzhou Bay.The results showed that,in the survey area,the concentration of PO3-4-P was 0.01～0.07 mg/dm3,DIN was 0.16～0.78 mg/dm3,and both values of PO3-4-P and DIN had scaled over Type Ⅳ water quality standards at some stations.262 species belonged to 82 genera of phytoplankton were identified,and there were 16 kinds of dominant species among them.The phytoplankton abundance average was 6.29×104 cells/L,and the annual average index of biodiversity was 3.87.The species number of phytoplankton had a decreasing trend from winter to autumn.There was an obvious seasonal change in the cell abundance,being the lowest(3.28×104 cells/L) in spring(March) and highest(9.25×104 cells/L) in summer(June).

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Available abstract

Environmental factors,phytoplankton species composition,dominant species,amount of distribution and community structure were investigated in January,March,June and September of 2010 in Maowei Sea of Qinzhou Bay.The results showed that,in the survey area,the concentration of PO3-4-P was 0.01～0.07 mg/dm3,DIN was 0.16～0.78 mg/dm3,and both values of PO3-4-P and DIN had scaled over Type Ⅳ water quality standards at some stations.262 species belonged to 82 genera of phytoplankton were identified,and there were 16 kinds of dominant species among them.The phytoplankton abundance average was 6.29×104 cells/L,and the annual average index of biodiversity was 3.87.The species number of phytoplankton had a decreasing trend from winter to autumn.There was an obvious seasonal change in the cell abundance,being the lowest(3.28×104 cells/L) in spring(March) and highest(9.25×104 cells/L) in summer(June).

Key concepts: Phytoplankton, Bay, Abundance (ecology), Environmental science, Relative species abundance, Oceanography, Community structure, Ecology

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