Studies of Dinosaur Bone Histology: Paleobiological Implications

恐龙骨组织学研究：古生​​物学意义

• 批准号: 9206603
• 负责人: Peter Dodson
• 金额: --
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-01 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9206603&HistoricalAwards=false
• 关键词: Studies; Dinosaur; Bone; Histology; Paleobiological

Dinosaur bone contains many significant features including fibro-lamellar bone, dense vascularization, and secondary haversian bone Such features are found in living endotherms, and have been cited as supporting the concept that dinosaurs were endothermic. Recently the view has emerged that all tissue types are found in both endotherms and ectotherms. Specific histological types of bone may indicate elevated growth rate. Combined with other approaches such as skeletochronology, some insight into metabolic rate may be obtained. Progress was made by careful investigation of the histology of series of femora that span the ontogeny of two Early Jurassic dinosaurs from Zimbabwe, Massospondylus carinatus and Syntarsus rhodesiensis. Both dinosaurs show fibrolamellar bone but neither shows all features of living endotherms. Massospondylus shows growth rings that indicate it took 15 years to attain a body size f 250 kg. Growth rate was indeterminate as in modern ectotherms. In Syntarsus growth was determinate as in living endotherms, but it took 7 years to attain the size of 20 kg. Each of these dinosaurs occupies a unique position on a physiological continuum between endothermy and ectothermy. The proposed study will extend the careful techniques worked out on the Zimbabwean dinosaurs to ontogenetic series of Triassic, Jurassic and Cretaceous dinosaurs from North America and Mongolia in order to obtain a phylogenetic, stratigraphic and geographic perspective on dinosaurian growth rates and the potential development of endothermy.

恐龙的骨头包含许多重要的特征， 纤维板层骨、致密血管化和继发性哈弗氏体 这些特征在活的恒温动物中发现， 被引用来支持恐龙是吸热的这一观点。 最近出现的观点是，所有组织类型都存在于 包括恒温动物和变温动物。 特定的组织学类型 骨骼可能表明生长速度加快。 结合其他 方法，如骨骼年代学，对代谢的一些见解， 率可以获得。 通过仔细的调查取得了进展 一系列股骨的组织学， 来自津巴布韦的侏罗纪早期恐龙，隆脊大椎龙 和罗得西亚合跗蛛 两种恐龙都有纤维板状骨 但都没有显示出活的恒温动物的所有特征。 巨椎龙的年轮表明它花了15年的时间 体重达到250公斤。 生长率不确定， 现代的外温动物 在Syntarsus中， 活的恒温动物，但它花了7年时间才达到20公斤的大小。 每一种恐龙都占据着一个独特的位置 内温性和外温性之间的生理连续体。 的 拟议的研究将扩大在 津巴布韦恐龙个体发育系列为三叠纪、侏罗纪 和白垩纪的恐龙 以获得系统发育、地层和地理观点， 关于毛里塔尼亚的增长率和发展潜力的报告 恒温动物