Dinosaurs, dragons, and dwarfs: The evolution of maximal body size

@article{Burness2001DinosaursDA,
  title={Dinosaurs, dragons, and dwarfs: The evolution of maximal body size},
  author={Gary Burness and Jared M. Diamond and Tim Fridtjof Flannery},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2001},
  volume={98},
  pages={14518 - 14523}
}
  • G. Burness, J. Diamond, T. Flannery
  • Published 27 November 2001
  • Environmental Science, Geography
  • Proceedings of the National Academy of Sciences of the United States of America
Among local faunas, the maximum body size and taxonomic affiliation of the top terrestrial vertebrate vary greatly. Does this variation reflect how food requirements differ between trophic levels (herbivores vs. carnivores) and with taxonomic affiliation (mammals and birds vs. reptiles)? We gathered data on the body size and food requirements of the top terrestrial herbivores and carnivores, over the past 65,000 years, from oceanic islands and continents. The body mass of the top species was… 

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References

SHOWING 1-10 OF 29 REFERENCES
The Ecology and Macroecology of Mammalian Home Range Area
TLDR
It is demonstrated that home range size is constrained to fit within a polygonal constraint space bounded by lines representing energetic and/or biophysical limitations, which suggests that the log‐linear relationship between home range area and mass may not be the appropriate function to compare against the energetically predicted slopes.
Body mass in large extant and extinct carnivores
TLDR
Two of the extinct carnivores (Smilodon fatalis and Panthera atrox) are estimated to be as much as one and a half times heavier than previously thought.
Walker's mammals of the world
From aardwolves and bandicoots to yapoks and zorillas, Ernest P. Walker's Mammals of the World is the most comprehensive-the pre-eminent-reference work on mammals. Now, completely revised and
The biomass, production and carrying capacity of giant tortoises on Aldabra
TLDR
The giant tortoise ( Geochelone gigantea (Schweigger) population of Aldabra has varied greatly in numbers since the beginning of the present century and it is suggested that shade factors limit the time available for feeding in Grande Terre.
Rapid dwarfing of red deer on Jersey in the Last Interglacial
  • A. Lister
  • Environmental Science, Geology
    Nature
  • 1989
TLDR
This work gives the first example in which the island dwarf is well dated, the full-sized ancestor is found in demonstrably older deposits on the island, and a good estimate can be made for the duration of the isolation leading to dwarfing.
Morphometric analysis of crocodylus porosus from the north coast of arnhem land northern australia
TLDR
Using measurements from 1354 C. porosus, derived formulae for predicting snout-vent length from 17 other attributes are derived, and the body size at which mandibular teeth protrude through the premaxilla is quantified.
An Estimated Weight of the Largest Known Bird
TLDR
Although the living ratites may not be closely related to the extinct ones of Madagascar and New Zealand, they are the closest approach to them in size and proportions, and may be used as a basis for calculations.
Energetics of Galapagos land iguanas: a comparison of two Island populations
Two species of Galapagos land iguanas were compared with respect to population densities and energetics. The energetic expenditures of the populations were calculated from data on body masses of the
An ecomorphological review of the dodo (Raphus cucullatus) and solitaire (Pezophaps solitaria), flightless Columbiformes of the Mascarene Islands
This paper describes a morphological study of the dodo Raphus cucullatus and solitaire Pezophaps solitaria extinct, flightless Columbiformes of the Mascarene Islands, Indian Ocean—based on mensural
Morphological and taxonomic study of the genus Tricoma Cobb (Nematoda : Desmoscolecida), with the description of new species from the Great Barrier Reef of Australia
TLDR
A detailed morphological study was made of the genus Tricoma of the anterior end and the internal structures, finding 12 new species and one new subspecies among the many species found in samples from the Great Barrier Reef of Australia.
...
...