新生代陆桥的动物迁移与气候变化

各大陆的动物区系既有差别又有联系，构造运动曾是大陆联接和分离的原动力，动物通过“陆桥”的迁移实现了各大陆之间的交流。但在新生代大幅度的气候变化中，海平面升降是造成陆桥时断时合的重要原因，古生物证据显示了陆桥的动物迁移与气候变化有着严格一致的对应关系。在温室效应日益严重的今天，全球气候变暖带来的海平面上升必然迫使许多物种去试图改变它们的分布范围，最后的受害者也包括人类自己。因此，认识动物迁移与气候变化的关系具有十分重要的现实意义。

THE RELATIONSHIP BETWEEN CLIMATIC CHANGES AND ANIMALS''''MIGRATION THROUGH LANDBRIDGES IN CENOZOIC

he faunal provinces among the continents have both difference and relation. The tectogensis is themotive force of the continental connection and separation, and animals' migration through the landbridgesbrings about interchanges between the continents. However, during enormous climatic changes in Cenozoic,the rise and fall of the sea level was an important reason that made the landbridges broken or joined. Theevidences of paleontology have proved that there is an identical relationship between climatic changes andanimals' migration through the landbridges. At present the greenhouse effect gets more and more seriousl asa result,the rise of the sea level,which is caused by the global climate's warming up, must force many speciesto change their distribution. and will harm mankind consequently. Therefore, it has pratical significance thatwe understand the relationship between animals' migration and climatic changes.