【摘 要】
：
Unequivocal Eocene suckers from China are for the first time reported here. This discovery demonstrates that catostomids of the Eocene Epoch (some 55-35 Ma ago)
【机 构】
：
Institute of Vertebrate Paleontology and Paleoanthropology,Natural History Museum,Institute of Hydro
论文部分内容阅读
Unequivocal Eocene suckers from China are for the first time reported here. This discovery demonstrates that catostomids of the Eocene Epoch (some 55-35 Ma ago) are scattered widely on mainland Asia as well as western North America. The present day disjunct distribution pattern of catostomids, with 68 extant species widespread in North America and the northern part of Middle America and only two in the restricted areas of Asia, is the result of their post-Eocene decline in Asia due to the competitive pressure from cyprinids, their Late Cenozoic radiation in North America, and the vicariant and dispersal events triggered by the changed biogeographic landscape. All of these prove to be a historical product of the geological, biological, and climatic changes throughout the Cenozoic.
其他文献
A 50 m firn core drilled in Princess Elizabeth Land, Antarctica, during the 1996/1997 Chinese First Antarctic Inland Expedition, has been measured for б18O and
Butterworth band-pass filter has been applied to S-wave data recorded at 8 stations in China mainland, and S-wave splitting at different frequency bands is anal
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
The Central Guizhou and Yichang Uplifts are present in central Guizhou to western Hubei. Biostratigraphic evidences from more than 20 sections in 14 counties of
The approaches to characterizing the surface topography of a rock joint can be simply grouped into statistical approaches and fractal geometrical approaches. Th
Earthquake and its resultant tsunami, as a kind of disaster events in geological history, may be recorded as event deposits of seismite and tsunamite. Typical c
社会科技进步和我国市场经济的加速发展使得掌握和能够使用数量分析方法的应用型经管类人才大受青睐,这就对高等教育人才培养提出新的挑战。统计学作为经济管理类专业的一门
本文在分析网络化多媒体教学的优势的基础上,探讨了目前网络化多媒体教学存在的问题,提出了将网络化多媒体技术和传统的课堂教学手段相结合的教学模式.
The metamorphic complex of the Julin Group occurs in the Yuanmou area of Yunnan Province on the western margin of the Yangtze Platform, and connects with the Ka
目的:通过设计基础医院记录表的应用效果,探索简化护理记录、缩短间接护理时间,提高护理质量.方法:将我院护士308名随机分为对照组和实验组各154例,分别采用传统的非表格式的