Dinosaur diversity during the transition between the middle and late parts of the Late Cretaceous in eastern Shandong Province,China:Evidence from dinosaur eggshells  

作　　者：ZHAO ZiKui ZHANG ShuKang WANG Qiang WANG XiaoLin 

机构地区：[1]Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2013年第36期4663-4669,共7页

基　　金：supported by the National Natural Science Foundation of China(41172018 and 41202003);the National Key Basic Research Program of China(2012CB821900);the Special Founds for the Paleontology and Paleoanthropology,Academia Sinica(9118)

摘　　要：The record of dinosaur eggs from the Upper Cretaceous Wangshi Group in eastern Shandong Province,China shows that the dinosaur species represented by elongatoolithids were present from the middle to the late Late Cretaceous,whereas those represented by the dictyoolithids and spheroolithids became extinct in the middle Late Cretaceous and the new species represented by ovaloolithids appeared in the late Late Cretaceous.Estimated eggshell conductance of water vapor is over 4 to over 115 times higher in spheroolithids and the dictyoolithids than in elongatoolithids and ovaloolithids,indicating that eggs of the first two oofamilies required higher humidity during incubation.Based on the18O record as preserved in eggshell,a change from relatively humid to relatively dry climatic conditions can be assumed to have taken place during the transition between the middle and late parts of the Late Cretaceous.It is reasonable to suggest that the change in climate was the cause of the dinosaur diversity.The record of dinosaur eggs from the Upper Cretaceous Wangshi Group in eastem Shandong Province, China shows that the dinosaur species represented by elongatoolithids were present from the middle to the late Late Cretaceous, whereas those repre- sented by the dictyoolithids and spheroolithids became extinct in the middle Late Cretaceous and the new species represented by ovaloolithids appeared in the late Late Cretaceous. Estimated eggshell conductance of water vapor is over 4 to over 115 times higher in spheroolithids and the dictyoolithids than in elongatoolithids and ovaloolithids, indicating that eggs of the first two oofamilies required higher humidity during incubation. Based on the δ^18O record as preserved in eggshell, a change from relatively humid to relatively dry climatic conditions can be assumed to have taken place during the transition between the middle and late parts of the Late Cretaceous. It is reasonable to suggest that the change in climate was the cause of the dinosaur diversity.

关 键 词：恐龙蛋壳 晚白垩世 山东省 多样性 中国 中东部 证据 后期 

分 类 号：Q915.5[天文地球—古生物学与地层学]