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Open AccessArticle10.18307/2009.0516

Standing crop and spatial distributional pattern of Mollusca in Lake Taihu, 2006-2007

Cai Yongjiu,Zhijun Gong,QIN Boqiang-2009-01-01-Journal of Lake Sciences

TL;DRAbstract

2006年11月至2007年10月对太湖软体动物进行了一周年调查.软体动物在30个采样点的出现率为90.0%,采集的232份样品中共记录到9科12属12种.软体动物在分布区的年均密度和生物量分别为266ind./m<sup>2</sup>、102.2g/mm<sup>2</sup>.河蚬(Corbicula fluminea)和铜锈环棱螺(Bellamya aeruginosa)是太湖软体动物的优势种,河蚬的出现率为90.0%,年均密度和生物量分别为174ind./mm<sup>2</sup>、58.3g/mm<sup>2</sup>,其主要分布在西南湖区(393-896ind./mm<sup>2</sup>)和贡湖湾(393-552ind./mm<sup>2</sup>);铜锈环棱螺的出现率为56.7%,年均密度和生物量分别为58ind./mm<sup>2</sup>、61.6g/mm<sup>2</sup>,主要分布在东太湖(140-299ind./mm<sup>2</sup>).主成分分析结果表明,河蚬空间分布格局取决于生境类型和底质性质,而螺类的分布与水生植物的分布相一致,说明水生植物对螺类的分布有重要影响,这与经典的螺-草互惠理论相一致.比较1987-2006年太湖软体动物群落结构变化发现,20年来河蚬的高值区域已由梅梁湾、竺山湾转变为大太湖,河蚬个体大小趋于小型化发展(P>0.001),而环棱螺小型化趋势并不显著(P=0.051).;An annual investigation of Mollusca was carried out in Lake Taihu between November 2006 and October 2007. Altogether12 species were recorded, belonging to 12 genera of 9 families in 232 samples. The occurrence frequency of benthic Mollusca was90.0% in 30 sampling sites. The annual average density and biomass of Mollusca in its distribution area were 266ind./m<sup>2

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2006年11月至2007年10月对太湖软体动物进行了一周年调查.软体动物在30个采样点的出现率为90.0%,采集的232份样品中共记录到9科12属12种.软体动物在分布区的年均密度和生物量分别为266ind./m<sup>2</sup>、102.2g/mm<sup>2</sup>.河蚬(Corbicula fluminea)和铜锈环棱螺(Bellamya aeruginosa)是太湖软体动物的优势种,河蚬的出现率为90.0%,年均密度和生物量分别为174ind./mm<sup>2</sup>、58.3g/mm<sup>2</sup>,其主要分布在西南湖区(393-896ind./mm<sup>2</sup>)和贡湖湾(393-552ind./mm<sup>2</sup>);铜锈环棱螺的出现率为56.7%,年均密度和生物量分别为58ind./mm<sup>2</sup>、61.6g/mm<sup>2</sup>,主要分布在东太湖(140-299ind./mm<sup>2</sup>).主成分分析结果表明,河蚬空间分布格局取决于生境类型和底质性质,而螺类的分布与水生植物的分布相一致,说明水生植物对螺类的分布有重要影响,这与经典的螺-草互惠理论相一致.比较1987-2006年太湖软体动物群落结构变化发现,20年来河蚬的高值区域已由梅梁湾、竺山湾转变为大太湖,河蚬个体大小趋于小型化发展(P>0.001),而环棱螺小型化趋势并不显著(P=0.051).;An annual investigation of Mollusca was carried out in Lake Taihu between November 2006 and October 2007. Altogether12 species were recorded, belonging to 12 genera of 9 families in 232 samples. The occurrence frequency of benthic Mollusca was90.0% in 30 sampling sites. The annual average density and biomass of Mollusca in its distribution area were 266ind./m<sup>2

Keywords

Corbicula flumineaMolluscaBayEcologyBiologyOceanographyGeology

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