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引用本文:蔡永久,龚志军,秦伯强.太湖软体动物现存量及空间分布格局(2006-2007年).湖泊科学,2009,21(5):713-719. DOI:10.18307/2009.0516
CAI Yongjiu,GONG Zhijun,QIN Boqiang.Standing crop and spatial distributional pattern of Mollusca in Lake Taihu, 2006-2007. J. Lake Sci.2009,21(5):713-719. DOI:10.18307/2009.0516
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太湖软体动物现存量及空间分布格局(2006-2007年)
蔡永久1,2, 龚志军1, 秦伯强1
1.中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008;2.中国科学院研究生院, 北京 100049
摘要:
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./m2、102.2g/mm2.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./mm2、58.3g/mm2,其主要分布在西南湖区(393-896ind./mm2)和贡湖湾(393-552ind./mm2);铜锈环棱螺的出现率为56.7%,年均密度和生物量分别为58ind./mm2、61.6g/mm2,主要分布在东太湖(140-299ind./mm2).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).
关键词:  太湖  软体动物  空间分布  河蚬  铜锈环棱螺
DOI:10.18307/2009.0516
分类号:
基金项目:国家自然科学基金项目(40730529,30770404);中国科学院知识创新工程重大项目(KZCX1-YW-14)联合资助
Standing crop and spatial distributional pattern of Mollusca in Lake Taihu, 2006-2007
CAI Yongjiu1,2, GONG Zhijun1, QIN Boqiang1
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, P.R.China
Abstract:
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./m2, 102.2g/m2,respectively. Corbicula fluminea and Bellamya aeruginosa were the dominant species of Mollusca in Lake Taihu. The occurrence frequencyof C. fluminea was 90.0%, and the annual average density and biomass were 174ind./m2, 58.3g/m2, respectively, which mainlydistributed in the southwest part of Lake Taihu(393-896ind./m2) and Gonghu Bay (393-552ind./m2); the occurrence frequency of B.aeruginosa was 56.7%, and the annual average density and biomass were 58ind./m2,61.6g/m2, respectively, which mainly distributedin the east part of Lake Taihu. Principal Components Analysis showed that habitat types and characteristics of sediment were the keyfactors determined the spatial distribution pattern of C. fluminea, while that of the gastropods was mainly influenced by the distribution ofmacrophytes, which coincided with the “mutualistic theory”. Analyzing the variation of Mollusca community structure between 1987and 2006, the results showed that the mainly distributed area of C. fluminea has changed from Meiliang Bay and Zhushan Bay to thecentral and southwest part of Lake Taihu, and the size of C. fluminea showed a tendency of decrease (P<0.001), while the averageweight of B. aeruginosa did not changed remarkably (P=0.051).
Key words:  Lake Taihu  Mollusca  spatial distribution  Corbicula fluminea  Bellamya aeruginosa
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