排序方式: 共有3条查询结果,搜索用时 93 毫秒
1
1.
四川有蹄动物区系形成的探讨 总被引:2,自引:0,他引:2
对四川有蹄动物现生种和化石种进行了比较,认为四川现今属东洋界的西南区和华中区有蹄动物区系是第三世纪上新世至第四纪中,晚更新世大熊猫-剑齿象动物群的发展和继续,属古北界的青藏高原区,相当于晚更新世的北方动物群。同时还讨论了四川有蹄动物的兴衰演替与地理迁移,以及横断山脉对有蹄动物的保存分化和扩散的特殊意义。 相似文献
2.
中国有蹄类栖息地选择研究进展 总被引:7,自引:0,他引:7
综述了中国有蹄类栖息地选择研究的特点和方法.简要介绍了在定性描述水平、不同空间和不同时间尺度上有蹄类栖息地选择的研究概况,以及有蹄类栖息地选择研究的几种常用方法和基本模型,探讨了这些方法的优缺点、误差来源和适用范围等.并探讨了栖息地片断化与隔离对野生动物种群的影响及其相关领域的研究现状. 相似文献
3.
Tooth enamel of mammalian fossils can efficiently preserve the original carbon isotopic mposition when they lived. The ungulate
fossils, especially equids in the early Early Pleistocene Bajiazui fauna from Qingyang, Gansu are studied. According to the
enriched relation of carbon isotopes between mammalian tooth enamel and grass diets, the fractions of C3 and C4 plants in this region at that time are reconstructed, which indicates that C3 grass occupied a dominant position. Because C3 grass adapts itself to cold and clamp climates, cur analytic results show that the time of the Bajiazui fauna was in a critical
state between a glacial stage beginning and a summer monsoon retreat, and it was a reflection to the turning cold event of
the global climate at the beginning of the Quaternary. 相似文献
1