Tyrannosaur Life Tables: An Example of Nonavian Dinosaur Population Biology

  title={Tyrannosaur Life Tables: An Example of Nonavian Dinosaur Population Biology},
  author={Gregory M. Erickson and Philip J. Currie and Brian D. Inouye and Alice A. Winn},
  pages={213 - 217}
The size and age structures for four assemblages of North American tyrannosaurs—Albertosaurus, Tyrannosaurus, Gorgosaurus, and Daspletosaurus—reveal a pronounced, bootstrap-supported pattern of age-specific mortality characterized by relatively high juvenile survivorship and increased mortality at midlife and near the maximum life span. Such patterns are common today in wild populations of long-lived birds and mammals. Factors such as predation and entrance into the breeding population may have… 
Tyrannosaurs as long-lived species
  • B. Weon
  • Environmental Science
    Scientific reports
  • 2016
This analysis clearly shows that mortality patterns for tyrannosaurs are seemingly analogous to those for 18th-century humans, which suggests that tyrannosaurs would live long to undergo aging before maximum lifespans, while their longevity strategy is more alike to big birds rather than 18th -century humans.
Theropod guild structure and the tyrannosaurid niche assimilation hypothesis: implications for predatory dinosaur macroecology and ontogeny in later Late Cretaceous Asiamerica
  • T. Holtz
  • Environmental Science, Geography
  • 2021
Well-sampled dinosaur communities from the Jurassic through the early Late Cretaceous show greater taxonomic diversity among larger (>50 kg) theropod taxa than communities of the Campano-Maastricht...
A distinct dinosaur life history?
Oviparity and parental care, predicted for dinosaurs by their extant phylogenetic bracket, have the least fossil support and the author cautions against overextending parsimonious interpretations to extinct taxa with the risk of obscuring novel or intermediate behaviours.
Mud-Trapped Herd Captures Evidence of Distinctive Dinosaur Sociality
A unique dinosaur assemblage from the Cretaceous beds of western Inner Mongolia preserves geologic and paleontologic data that clearly delineate both the timing and mechanism of death. Over twenty
A Life Table for Psittacosaurus lujiatunensis: Initial Insights Into Ornithischian Dinosaur Population Biology
The static life table analysis revealed the same general pattern of survivorship as tyrannosaurs including increased attrition before the attainment of full adult size, suggesting that most nonavian dinosaurs may have had a similar life history strategy.
The Tyrant Lizard King, Queen and Emperor: Multiple Lines of Morphological and Stratigraphic Evidence Support Subtle Evolution and Probable Speciation Within the North American Genus Tyrannosaurus
All skeletal specimens of the North American dinosaur Tyrannosaurus and a number of trace fossils have been attributed to the single species: T. rex . Although an unusual degree of variation in
A revised life table and survivorship curve for Albertosaurus sarcophagus based on the Dry Island mass death assemblageThis article is one of a series of papers published in this Special Issue on the theme Albertosaurus.
In 1910 a crew from the American Museum of Natural History discovered a bone bed composed primarily of the large tyrannosaurid Albertosaurus sarcophagus in what is now Dry Island Buffalo Jump
Ecological Interactions in Dinosaur Communities: Influences of Small Offspring and Complex Ontogenetic Life Histories
It is suggested that differences in reproductive strategy, and consequently ontogeny, explain observed differences in community structure between dinosaur and mammal faunas.
The influence of juvenile dinosaurs on community structure and diversity
It is demonstrated that juvenile megatheropods likely filled the mesocarnivore niche, resulting in reduced overall taxonomic diversity, and suggests that ontogenetic niche shift was an important factor in generating dinosaur community structure and diversity.
Palaeodemographics of small-bodied mammals in Pleistocene environments: a case study of muskrats (Ondatra zibethicus: Rodentia: Muridae) from north Florida
The fossil record shows a potential for investigating links between climate change and the demographics of palaeopopulations, and warmer temperatures, aridity, water table fluctuation, and human presence all comprise potential factors leading to a lower life expectancy during this time interval.


African Ungulate Life Tables
Three of the species are shown to have the typical logarithmic negatively—skewed adult curve shown by undisturbed large mammal populations, but warthogs apparently have a heavy age—constant number of deaths to middle—age.
Patterns of survivorship in turtles (order Testudines)
Survivorship data by general age-class are reviewed for 30 species of turtles representing nine families, with turtles exhibiting higher survivorship early in life than freshwater turtles and marine turtles also tend to have the lowest survivorship as adults.
Gender-Specific Reproductive Tissue in Ratites and Tyrannosaurus rex
The presence of endosteally derived bone tissues lining the interior marrow cavities of portions of Tyrannosaurus rex hindlimb elements are reported, and it is hypothesized that these tissues are homologous to specialized avian tissues known as medullary bone.
Assessing dinosaur growth patterns: a microscopic revolution.
  • G. Erickson
  • Geography, Environmental Science
    Trends in ecology & evolution
  • 2005
Craniofacial ontogeny in Tyrannosauridae (Dinosauria, Coelurosauria)
An increase in tooth width, accompanied by loss of tooth positions, and a global shift from an immature gracile to a mature robust morphotype in the craniofacial skeleton typifies the ontogenetic changes in T. rex.
Cannibalism in the Madagascan dinosaur Majungatholus atopus
Intensely tooth-marked elements from multiple individuals show that Majungatholus defleshed dinosaur carcasses and clearly fed upon the remains of not only sauropods, but also conspecifics, and thus was a cannibal.
Dinosaurian growth patterns and rapid avian growth rates
It is shown that dinosaurs exhibited sigmoidal growth curves similar to those of other vertebrates, but had unique growth rates with respect to body mass.
  • D. Promislow
  • Environmental Science
    Evolution; international journal of organic evolution
  • 1991
Evidence is presented in support of the hypothesis that senescence will be lower in large‐brained taxa, an increase in the probability of mortality with age, which is highest in short‐lived species with short generation times.
Plant and Animal Populations: Methods in Demography
Introduction to life tables projection from a life table more ways of combining surviva and fecundity life-cycle graphs the Leslie matrix transient behaviour in population growth sensitivity analysis
Life Tables for Natural Populations of Animals
  • E. Deevey
  • Geography, Biology
    The Quarterly Review of Biology
  • 1947
In selecting from Deevey’s extensive review, we have tried to emphasize the different types of problems that arise in working with animal populations; our most serious omission is a detailed study of