东南亚大型动物和人类灭绝的环境驱动因素
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
在PubMed上查看摘要
概括
此摘要是机器生成的。东南亚地区
科学领域
- 古气候学
- 古生物学
- 古人类学
背景情况
- 东南亚对于了解人类和哺乳动物的迁移和灭绝至关重要.
- 稳定同位素研究在非洲至关重要,
- 该地区至少有五个Homo属的成员.
研究的目的
- 使用稳定同位素数据重建东南亚的古环境历史.
- 研究环境变化对哺乳动物动物变化和人类进化的影响.
- 填补这个关键地区稳定同位素研究的研究缺口.
主要方法
- 对东南亚哺乳动物稳定同位素数据的大规模数据集的分析.
- 在四年纪期间测定样品的年代,以建立时间框架.
- 动物变化与已识别的古环境转变的相关性.
主要成果
- 早期的普莱斯托时代森林转变为中期普莱斯托时代的草原,有利于放牧动物,并导致鱼灭绝.
- 草原在晚期普莱斯托纪减少,被全新纪封顶雨林所取代.
- 雨林促进了适应物种和人类的兴起,
结论
- 东南亚的环境变化显著影响了哺乳动物和人类群体.
- 从草原到雨林生态系统的转变影响了物种的分布和生存.
- 东南亚的现代巨型动物仅限于受威胁的雨林息地.
相关概念视频
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
Conservation efforts often utilize scientific approaches to identify the reasons, or the agents, causing the population to decline. This approach then devises steps to remove, oppose, or neutralize the agents.
Conservation efforts may also introduce a test group to determine the probable cause of the decline. The...
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
For one, natural selection can only act upon existing genetic variation. Hypothetically, red tusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for red tusks, natural selection cannot...
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
Perforation and dissection often occur during the initial stages of...
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics....