Gigantism and comparative life-history parameters of tyrannosaurid dinosaurs

@article{Erickson2004GigantismAC,
  title={Gigantism and comparative life-history parameters of tyrannosaurid dinosaurs},
  author={Gregory M. Erickson and Peter J Makovicky and Philip J. Currie and Mark A. Norell and Scott A. Yerby and Christopher A. Brochu},
  journal={Nature},
  year={2004},
  volume={430},
  pages={772-775}
}
How evolutionary changes in body size are brought about by variance in developmental timing and/or growth rates (also known as heterochrony) is a topic of considerable interest in evolutionary biology. [] Key Result T. rex had a maximal growth rate of 2.1 kg d-1, reached skeletal maturity in two decades and lived for up to 28 years. T. rex's great stature was primarily attained by accelerating growth rates beyond that of its closest relatives.
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It is shown by counting lines of arrested growth and performing growth curve reconstructions that Tenontosaurus, Allosaurus, and Tyrannosaurus were reproductively mature by 8, 10, and 18 years, respectively, which suggests that these dinosaurs were born relatively precocial and experienced high adult mortality.
Osteohistological analyses reveal diverse strategies of theropod dinosaur body-size evolution
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The first evidence of a lack of strong mechanistic or physiological constraints on size evolution in the largest bipeds in the fossil record is provided and evidence of one of the longest-living individual dinosaurs ever documented is provided.
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It is suggested that the combination of histological and molecular methods holds great potential for examining the preserved tissues of dinosaurs, basal birds, and their extant relatives, and the development of novel techniques with which to further investigate important paleontological questions are discussed.
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The evolution of intraspecific variation, growth, and body size in early theropod dinosaurs
TLDR
The authors' analyses suggest intraspecific variation in growth is high in early dinosaurs but largely absent in birds, and non-metric multidimensional scaling analysis suggests this variation is not related to sexual differences.
Rise of dinosaurs reveals major body-size transitions are driven by passive processes of trait evolution
TLDR
A new body-size dataset of more than 400 therapsid and archosauromorph species spanning the Late Permian–Middle Jurassic is analysed, indicating intrinsic, biological factors are more important than the external environment and maximum size of Middle–early Late Triassic archosuromorph predators exceeds that of contemporary herbivores.
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