作　　者： ; ; ; ; ;

机构地区： 浙江海洋学院

出　　处： 《微体古生物学报》 2013年第4期415-422,共8页

摘　　要： 作者对舟山港区43个表层沉积物样品进行定量分析,共鉴定出底栖有孔虫33属60种。研究海域各站位均发现浮游有孔虫壳体,个体细小、属种单一,未发现活体个体。研究海域底栖有孔虫组合以玻璃质壳为主,平均含量86.71%,有孔虫丰度均值为1 676枚/50克,总体有孔虫组合为Ammonia beccarii vars.-A.maruhasii-Epistominella naraensis。研究发现,表层沉积物中大个体有孔虫(Ammonia beccarii vars.等)与小个体有孔虫(Epistominella naraensis)分布与潮流搬运呈密切相关关系,提示可能存在不同的搬运机制。与前人研究相比,研究海域有孔虫组合呈现以下变化:(1)胶结质壳有孔虫含量增加,个别站位出现15.89%的高值;(2)出现耐污染属种;(3)环境敏感属种畸形比例增加。研究表明,沉积搬运作用和环境参数变化是影响研究区有孔虫组合的重要因素,为有孔虫作为环境指标的进一步研究提供了基础数据。 In this study, 43 surface samples were collected from the central part of Zhoushan Harbour, and to deter mine the characteristics of local foraminiferal assemblage. Totally 60 species in 33 genus were recognized. The results showed that, planktonic foraminifera were found in all stations with small size, low diversity and non-living individu als. The benthic foraminiferal assemblages were dominated by hyaline test species, with an average percentage of 86.71%, and an average abundance of 1676 individuals per 50 grams dry samples. The assemblage in the study area, named Ammonia beccarii vars. -A. maruhasii-Epistominella naraensis assemblage, were mainly shallow marine envi ronmental species. The study showed significant correlation between the distribution of Ammonia beccarii vats. and Epistominella naraensis. The former has relatively large test size, while the later has small size, suggesting different hydrodynamic process. Compared with the previous researches in this region, new characteristics of the foraminiferal assemblage could be concluded as： （1） the increasing in percentages of agglutinated species, with the highest value of 15.89 % ; （2） appearance of some pollution-tolerant species; （3） higher ratio of deformed individuals in sensitive spe cies. Sediment transport and environmental quality are proposed to have great impacts on the distribution of foramini fera fauna which provides basic foraminiferal information as an important environmental indicator.

关 键 词： 底栖有孔虫 表层沉积物 港湾 舟山

领　　域： [天文地球] [天文地球]