The Origin of Alligator sinensis  

作　　者：莫鑫泉 赵铁军 秦鹏春 

机构地区：[1]Molecular Evolution Laboratory, Institute of Developmental Biology, Academia Sinica, Beijing 100080, PRC [2]Department of Biotechnology, Northeast Agricultural College, Harbin 150030, PRC

出　　处：《Science China Chemistry》1993年第3期279-287,共9页中国科学（化学英文版）

基　　金：This study was partly supported by a research grant (3870295) from the National Natural Science Foundation of China;a research grant (RF84031) of the Rockefeller Foundation from the United States.

摘　　要：Alligator sinensis and Alligator mississippiensis are put under the Alligator family and Alligator genus as two different species and have been thought that they are closely related in taxonomy. The results of our DNA-DNA hybridization experiments showed that A. sinensis is a relatively young species originated in Asia,whereas A. mississippiensis is the older.It seems that the alligator and crocodilian could evolve from each other.The evolutionary rate of the crocodilian is slower than those of birds and higher vertebrates.The phylogeny of four crocodilians have been obtained and the hypothesis that the ancestor of Crocodylus porosus is a transitional form between A.mississippiensis and A.sinensis is proposed.Alligator sinensis and Alligator mississippiensis are put under the Alligator family and Alligator genus as two different species and have been thought that they are closely related in taxonomy. The results of our DNA-DNA hybridization experiments showed that A. sinensis is a relatively young species originated in Asia,whereas A. mississippiensis is the older.It seems that the alligator and crocodilian could evolve from each other.The evolutionary rate of the crocodilian is slower than those of birds and higher vertebrates.The phylogeny of four crocodilians have been obtained and the hypothesis that the ancestor of Crocodylus porosus is a transitional form between A.mississippiensis and A.sinensis is proposed.

关 键 词：Yangzi ALLIGATOR PHYLOGENY DNA-DNA hybridization. 

分 类 号：O6[理学—化学]