Aging, Maturation and Growth of Sauropodomorph Dinosaurs as Deduced from Growth Curves Using Long Bone Histological Data: An Assessment of Methodological Constraints and Solutions.
Aging, Maturation and Growth of Sauropodomorph Dinosaurs as Deduced from Growth Curves Using Long Bone Histological Data: An Assessment of Methodological Constraints and Solutions.
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DOI：
10.1371/journal.pone.0067012
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Sander PM
中科院分区：
文献类型：
--
作者：
Griebeler EM;Klein N;Sander PM
关于衰老、成熟和生长的信息对于理解生物体的生活史是重要的。在已灭绝的恐龙中，这些信息可以从保存在长骨中轴皮质中的组织学生长记录中获得。在这里，我们构建了生长模型来估计死亡年龄，性成熟年龄，个体完全生长的年龄，以及保存在六个蜥脚类恐龙个体（一个不确定的mamenchisaurids，两个迷惑龙sp.，两种不确定的双齿龙和一种圆顶龙）和一个蜥脚类恐龙个体（板龙）。使用这些估计，我们建立体重和这些性状之间的异速生长，并将其与现存的类群进行比较。每个恐龙个体的生长模型有冯·贝塔朗菲模型（英语：von Bertalanffy model）、龚佩茨模型（英语：Gompertz model）和逻辑模型（英语：Logistic model），所有这些模型都有固有的固定拐点，而查普曼-理查兹模型的拐点是不固定的。我们使用的算术平均值的年龄在拐点和年龄的90%的渐近质量达到分别评估的年龄在性成熟或生殖开始时的年龄，因为缺乏明确的指标Sauropodomorpha成熟。根据基于AIC的模型选择过程，LGM是我们的sauropodomorph样本的最佳模型。建立的异速生长与其他蜥脚类的文献数据一致。所有Sauropodomorpha达到完整的大小在一个时间跨度内类似于按比例放大的现代哺乳动物的大型食草动物，并有类似的最大增长率按比例放大的现代大型食草动物和平胸类，但Sauropodomorpha的增长率低于平均哺乳动物。蜥脚类动物的死亡年龄可能低于平均比例放大的平胸类和大型食草动物。蜥脚形类在成熟时比按比例放大的平胸类和平均哺乳动物年龄大，但比按比例放大的大型食草动物年龄小。
Information on aging, maturation, and growth is important for understanding life histories of organisms. In extinct dinosaurs, such information can be derived from the histological growth record preserved in the mid-shaft cortex of long bones. Here, we construct growth models to estimate ages at death, ages at sexual maturity, ages at which individuals were fully-grown, and maximum growth rates from the growth record preserved in long bones of six sauropod dinosaur individuals (one indeterminate mamenchisaurid, two Apatosaurus sp., two indeterminate diplodocids, and one Camarasaurus sp.) and one basal sauropodomorph dinosaur individual (Plateosaurus engelhardti). Using these estimates, we establish allometries between body mass and each of these traits and compare these to extant taxa. Growth models considered for each dinosaur individual were the von Bertalanffy model, the Gompertz model, and the logistic model (LGM), all of which have inherently fixed inflection points, and the Chapman-Richards model in which the point is not fixed. We use the arithmetic mean of the age at the inflection point and of the age at which 90% of asymptotic mass is reached to assess respectively the age at sexual maturity or the age at onset of reproduction, because unambiguous indicators of maturity in Sauropodomorpha are lacking. According to an AIC-based model selection process, the LGM was the best model for our sauropodomorph sample. Allometries established are consistent with literature data on other Sauropodomorpha. All Sauropodomorpha reached full size within a time span similar to scaled-up modern mammalian megaherbivores and had similar maximum growth rates to scaled-up modern megaherbivores and ratites, but growth rates of Sauropodomorpha were lower than of an average mammal. Sauropodomorph ages at death probably were lower than that of average scaled-up ratites and megaherbivores. Sauropodomorpha were older at maturation than scaled-up ratites and average mammals, but younger than scaled-up megaherbivores.
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影响因子：
64.8
作者：
Erickson, GM;Makovicky, PJ;Brochu, CA
通讯作者：
Brochu, CA
影响因子：
2.7
作者：
BLUEWEISS, L;FOX, H;SAMS, S
通讯作者：
SAMS, S
影响因子：
1.4
作者：
Curry, KA
通讯作者：
Curry, KA
影响因子：
1.5
作者：
Bybee, PJ;Lee, AH;Lamm, ET
通讯作者：
Lamm, ET
影响因子：
64.8
作者：
Erickson, GM;Rogers, KC;Yerby, SA
通讯作者：
Yerby, SA