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Modelling growth, vital statistics and energy budget of sauropods: key features contributing to gigantism.

蜥脚类恐龙的生长、生命统计和能量预算建模：导致巨人症的关键特征。

基本信息

批准号：
36760069
负责人：
Professorin Dr. Eva Maria Griebeler
金额：
--
依托单位：
Abteilung Paläontologie
依托单位国家：
德国
项目类别：
Research Units
财政年份：
2007
资助国家：
德国
起止时间：
2006-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/36760069?language=en
关键词：
Modelling growth vital statistics energy

项目摘要

Age- and size specific mortality rates and fecundities show considerable variation among species. They reflect characteristics of life-cycles (e.g. age at sexual maturity, longevity), determine the demography (e.g. intrinsic rate of increase, generation time), and vital statistics of populations. Fecundity and growth in body size are linked because the energy uptake of an organism is limited. Body size is also linked to mortality and to the proportion of energy uptake required for the maintenance of the organism. Here, we will establish age- and size specific mortality rates and fecundities for sauropods by applying different modelling methods. These include an approach that is based on the hotly debated metabolic theory of ecology (MTE). We will also elaborate a simple model for age- and size specific allocation of energy to maintenance, growth and reproduction. These models will allow us to test a number of current hypotheses on life-cycles of sauropods with respect to their reproductive biology, mortality schedule and growth in body mass. Mortality and fecundity rates of extant taxa (birds, crocodiles, turtles and mammals) will be used to validate our models and to base our extrapolation of results for sauropods. Empirical data on extant taxa will compiled from the literature, but growth curves for sauropod will be generated by original research on bone histology. Our project provides a further test of MTE because mortalities and fecundity will be estimated for a larger group of extant taxa than those analyzed for MTE.

特定年龄和大小的死亡率和繁殖力显示物种之间有相当大的差异。它们反映生命周期的特征（例如性成熟年龄、寿命），决定人口统计学（例如内在增长率、世代时间）和人口的生命统计。繁殖力和身体大小的增长是联系在一起的，因为生物体的能量吸收是有限的。身体大小也与死亡率和维持机体所需的能量摄取比例有关。在这里，我们将建立年龄和大小特定的死亡率和繁殖力蜥脚类动物通过应用不同的建模方法。其中包括一种基于激烈争论的生态学代谢理论（MTE）的方法。我们还将详细说明一个简单的模型，用于根据年龄和体型将能量分配给维持、生长和繁殖。这些模型将使我们能够测试一些目前的假设的生活周期的蜥脚类动物的生殖生物学，死亡时间表和身体质量的增长。现存类群（鸟类，鳄鱼，海龟和哺乳动物）的死亡率和繁殖率将被用来验证我们的模型，并根据我们的外推结果蜥脚类动物。现存分类群的经验数据将从文献中汇编，但蜥脚类动物的生长曲线将由骨组织学的原始研究产生。我们的项目提供了一个进一步的测试MTE，因为死亡率和繁殖力将估计为一个更大的组的现存类群比MTE分析。