北部湾海域小型底栖动物丰度和生物量

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Abstract

A biological investigation was made in the Beibu Gulf in October 2008.The composition,abundance,and biomass of meiobenthos were analyzed.Totally,there were 14 meiobenthos identified.The results showed that the average abundance of meiobenthos was 399.09±452.20 ind·10cm^-2,and average biomass was 359.56±324.45μg·10cm^-2(dry weight).As to the abundance, free-living marine nematode was the most dominant group,with a relative dominance of 92.69%.Benthic Copepoda and Polychaeta followed,which accounted for 3.28% and 2.47% of total abundance.In terms of biomass,nematode was also the dominant group, accounting for 41.16% of total biomass.Polychaeta and Copepoda occupied 38.34% and 6.67% of total biomass respectively. Meiobenthos abundance was the highest in the coastal area of Qinzhou and Fangchenggang City,and the average abundance was 614.98±799.63 ind·10cm^-2 in this area.The average abundance of meiobenthos was 481.68±240.03 ind·10cm^-2 in the Weizhou Island coastal area,and 278.14±126.38 ind·10cm^-2 in the southern Beihai City coastal area.Average abimdance was the lowest in the contrast coastal area(197.37±116.72 ind·10cm^-2).The biodiversity indexes were analyzed based on the composition and abundance.The Margalefs index ranged from 0.466 to 1.516 in all stations;the Pielou's index ranged form 0.203 to 1.13;the Shannon-Weiner's index ranged from 0.141 to 0.783.The meiobenthos was divided into three different communities in the study area.The ratio of nematode to Copepoda(R value) ranged from 5.02 to 223.83.

Key words： meiobenthos abundance biomass N/C ratio the Beibu Gulf

Received: 25 August 2011

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	Articles by authors
	WANG Yan-guo
	WANG Chun-guang
	CHEN xiao-yin
	LIN Mao
	XIANG Peng
	WANG Yu

Cite this article:

WANG Yan-guo,WANG Chun-guang,CHEN xiao-yin, et al. Abundance and biomass of meiobenthos in the Beibu Gulf[J]. , 2011, 30(4): 375-382.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2011/V30/I4/375

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