Abstract:

As the distribution of Lamprotula fauna was controlled by climate and environment，the study on Lamprotula fauna might reconstruct the palaeoenvironment at that time. 13 species of the Holocene Unionidae fossils were found in Baiyangdian area of Hebei Province，which belonged to Lamprotula-Cuneopsis-Unio assemblage named as Baiyangdian Lamprotula fauna. Compared that fauna with the modern Lamprotula fauna living in Taihu Lake，Poyang Lake，Dongting Lake and their surrounding water in the Yangtze River downstream watersheds，and the Middle Holocene Lamprotula fauna found in Wangyin of Shandong Province and Xishuipo of Henan Province，they all belonged to the China-India Subrealm of Oriental Realm and in lacustrine environment in subtropical humid climate zone，although Baiyangdian Lamprotula fauna contained certain similar characteristics of the mentioned faunas with low diversity in assemblage during the early Middle Holocene. It was indicated that the north boundary of the North Subtropics and the Oriental Realm was located in Beijing-Tianjin area to the north of Baiyangdian，and extended westwards to Hetao area of Inner Mongolia Autonomous Region.

Key words: Baiyangdian area, Holocene, Lamprotula fauna, Oriental Realm, palaeoenvironment

摘要：

丽蚌动物群的分布受气候和地理环境控制，研究地层中的丽蚌动物群可以恢复当时的古环境。在河北省白洋淀地区全新统共发现13种珠蚌科(Unionidae)的化石，属 Lamprotula-Cuneopsis-Unio 组合，称为白洋淀丽蚌动物群。该动物群与长江中下游流域太湖、鄱阳湖、洞庭湖及其周围水域的现代丽蚌动物群和山东王因、河南西水坡中全新世丽蚌动物群相比，虽然分异度低，但其组合特征相似，同属东洋界中印亚界动物地理区，生活于亚热带湿热气候下的河湖环境中。推测白洋淀丽蚌动物群的生活时代应为中全新世早期，当时北亚热带和东洋界的北界应在白洋淀以北的京津—河套一带。

关键词: 白洋淀地区, 全新世, 丽蚌动物群, 东洋界, 古环境

CLC Number: 

• Q915.5