生长速度会影响到迈祖龙胫骨的血流速度

IF 2.6 2区 地球科学 Q2 BIODIVERSITY CONSERVATION
Paleobiology Pub Date : 2023-09-13 DOI:10.1017/pab.2023.24
Roger S. Seymour, Heath R. Caldwell, Holly N. Woodward, Qiaohui Hu
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引用次数: 0

摘要

化石骨曾经是活体组织,其内部血液灌注需要与其代谢需求成比例。代谢率主要与幼年期的骨骼生长(建模)和后期受负重和运动(重塑)影响的现有骨骼的改变和修复有关。本研究根据骨骼化石中初级营养孔的大小,估计了白垩纪晚期鸭嘴龙(hadrosaurus Maiasaura peeblesorum)胫骨轴的血流量。孔大小定量反映动脉大小,从而反映血流速率。结果表明,幼鱼(约1岁)的骨代谢强度是6- 11岁成鱼的4倍以上。这一差异比标准代谢比例预期的要大得多,这被解释为从快速生长的幼鱼对初级骨骼建模的高代谢需求,到成年鱼对重塑骨骼以修复运动和负重过程中积累的微骨折的低代谢需求的转变。成年动物的大营养孔表明了高水平的快速代谢恒温动物的运动特征。这些结果的实际价值是,在与体重有关的骨灌注的种间分析中,少年期和成年期应该分开处理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Growth rate affects blood flow rate to the tibia of the dinosaur Maiasaura
Abstract Fossil bones were once living tissues that demanded internal blood perfusion in proportion to their metabolic requirements. Metabolic rates were primarily associated with bone growth (modeling) in the juvenile stages and with alteration and repair of existing bone affected by weight bearing and locomotion (remodeling) in later stages. This study estimates blood flow rates to the tibia shafts of the Late Cretaceous hadrosaurid Maiasaura peeblesorum , based on the size of the primary nutrient foramina in fossil bones. Foramen size quantitatively reflects arterial size and hence blood flow rate. The results showed that the bone metabolic intensity of juveniles (ca. 1 year old) was greater than fourfold higher than that of 6- to 11-year-old adults. This difference is much greater than expected from standard metabolic scaling and is interpreted as a shift from the high metabolic demands for primary bone modeling in the rapidly growing juveniles to a lower metabolic demand of adults to remodel their bones for repair of microfractures accumulated during locomotion and weight bearing. Large nutrient foramina of adults indicate a high level of cursorial locomotion characteristic of tachymetabolic endotherms. The practical value of these results is that juvenile and adult stages should be treated separately in interspecific analyses of bone perfusion in relation to body mass.
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来源期刊
Paleobiology
Paleobiology 地学-古生物学
CiteScore
5.30
自引率
3.70%
发文量
38
审稿时长
>12 weeks
期刊介绍: Paleobiology publishes original contributions of any length (but normally 10-50 manuscript pages) dealing with any aspect of biological paleontology. Emphasis is placed on biological or paleobiological processes and patterns, including macroevolution, extinction, diversification, speciation, functional morphology, bio-geography, phylogeny, paleoecology, molecular paleontology, taphonomy, natural selection and patterns of variation, abundance, and distribution in space and time, among others. Taxonomic papers are welcome if they have significant and broad applications. Papers concerning research on recent organisms and systems are appropriate if they are of particular interest to paleontologists. Papers should typically interest readers from more than one specialty. Proposals for symposium volumes should be discussed in advance with the editors.
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