【摘要】 <正>目前,我国沿海和陆架区所钻遇的新生代“海相层”,大多为滨海-近岸浅海或海陆过渡相沉积,为了恢复这些地层的沉积环境,必须对现代滨海-近岸浅海或海陆过渡相中的各种沉积环境,如潮上带、潮间带、潮下带、河口、海湾和泻湖等的有孔虫和介形类等生物组合及其生态分布规律进行深入的研究.进而,以“将今论古”的原则,应用于地史时期,尤其是第四系的研究中,恢复其古地理、古环境.近年来,我国不少学者已开始了这方面的工作.本文的目的,在于介绍这一具体环境下有孔虫和介形类的组合面貌及分布特征,积累一点有关资料.相信这对本区第四系的研究将有一定的参考价值.更多还原

【Abstract】 The assemblages of foraminifera and ostracode which were collected from surface sediments in a small bay located at the northeastern Jiaozhou Bay, Shandong are studied. The water depths are 0-5.33m and the environments are referred to intertidal flat, tidal channel and shallow subtidal "zones there.The temperature and salinity of surface water were 25.67℃ and 30.74‰ inAugust, 1980 and 2.52℃ and 30.71‰ in February, 1981 determined at the mouth of the small bay respectively. 64 species of Foraminiferal and 56 of Ostracoda are found in total. Among them 22 foraminiferal species and 25 ostracode species are referred to the living, but for the species numbers of foraminifera and Ostracoda within the variability (95% in the total shells) are only 15 and 19 (the total) and 9 and 15 (the living) respectively, which are rather low. The diversities H(S) are also low, mostly no more than 2, but the average dominances are quite high (>45%). These characters, lower diversities and variabilities and higher dominances, are closely related to the environments.The Ammonia beccarii vars. assemblage of foraminifera is dominated by the species Ammonia beccarii (Linne) vars. (55.9% in the total and 77.6% in the living). The ostracode assemblage Bicornucythere bisanensis-Loxoconcha ocellata is subdivided into two subassemblages, the intertidal flat Loxoconcha ocellata subassemblage which is dominated by the species Loxoconcha ocellata Ho (81.5% in the total and 77.3% in the living) and the tidal channel-subtidal Bicornucy-there bisanensis-Sinocytheridea latiovata subassemblage which is dominated by 3 species Bicornucy there bisanensis (Okubo), Sinocytheridea latiovata Hou et Chen and Neomonoceratina crispata Hu.The factors controling distribution of Foraminifera and Ostracoda are discussed. First, water depth acts as the most important factor in the small bay. It controls numbers of species and test (or shell), i. e. the numbers increase along with increasing water depth from north to south and from tidal flat to tidal channel and subtidal zone. It also controls the distribution of genera and species. Secondly, the conditions of hydrodynamics and substrata take a second place. Because the investigated area is too small to make differences of salinity and temperature, it is difficult to discuss the influences of solinity and temperature on distribution of foraminifera and ostracode.更多还原