Resources and energetics determined dinosaur maximal size
- 21 July 2009
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 106 (29), 12184-12188
- https://doi.org/10.1073/pnas.0904000106
Abstract
Some dinosaurs reached masses that were approximately 8 times those of the largest, ecologically equivalent terrestrial mammals. The factors most responsible for setting the maximal body size of vertebrates are resource quality and quantity, as modified by the mobility of the consumer, and the vertebrate's rate of energy expenditure. If the food intake of the largest herbivorous mammals defines the maximal rate at which plant resources can be consumed in terrestrial environments and if that limit applied to dinosaurs, then the large size of sauropods occurred because they expended energy in the field at rates extrapolated from those of varanid lizards, which are approximately 22% of the rates in mammals and 3.6 times the rates of other lizards of equal size. Of 2 species having the same energy income, the species that uses the most energy for mass-independent maintenance of necessity has a smaller size. The larger mass found in some marine mammals reflects a greater resource abundance in marine environments. The presumptively low energy expenditures of dinosaurs potentially permitted Mesozoic communities to support dinosaur biomasses that were up to 5 times those found in mammalian herbivores in Africa today. The maximal size of predatory theropods was approximately 8 tons, which if it reflected the maximal capacity to consume vertebrates in terrestrial environments, corresponds in predatory mammals to a maximal mass less than a ton, which is what is observed. Some coelurosaurs may have evolved endothermy in association with the evolution of feathered insulation and a small mass.Keywords
This publication has 54 references indexed in Scilit:
- In vitro digestibility of fern and gymnosperm foliage: implications for sauropod feeding ecology and diet selectionProceedings Of The Royal Society B-Biological Sciences, 2008
- The Costs of CarnivoryPLoS Biology, 2007
- Dinosaur Fossils Predict Body TemperaturesPLoS Biology, 2006
- Dinosaur body temperatures: the occurrence of endothermy and ectothermyPaleobiology, 2003
- Body Size Overlap, Habitat Partitioning and Living Space Requirements of Terrestrial Vertebrate Predators: Implications for the Paleoecology of Large Theropod DinosaursHistorical Biology, 2002
- DINOSAUR BIOLOGYAnnual Review of Ecology and Systematics, 1995
- Dinosaur BiologyAnnual Review of Ecology and Systematics, 1995
- The largest land mammal ever imaginedZoological Journal of the Linnean Society, 1993
- Similarity in Energy Budgets of Animal PopulationsJournal of Animal Ecology, 1982
- The size, structure and distribution of the giant tortoise population of AldabraPhilosophical Transactions of the Royal Society of London. B, Biological Sciences, 1978