A general scaling law reveals why the largest animals are not the fastest

@article{Hirt2017AGS,
  title={A general scaling law reveals why the largest animals are not the fastest},
  author={Myriam R Hirt and Walter Jetz and Bj{\"o}rn C. Rall and Ulrich Brose},
  journal={Nature Ecology \& Evolution},
  year={2017},
  volume={1},
  pages={1116-1122}
}
Speed is the fundamental constraint on animal movement, yet there is no general consensus on the determinants of maximum speed itself. Here, we provide a general scaling model of maximum speed with body mass, which holds across locomotion modes, ecosystem types and taxonomic groups. In contrast to traditional power-law scaling, we predict a hump-shaped relationship resulting from a finite acceleration time for animals, which explains why the largest animals are not the fastest. This model is… 

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References

SHOWING 1-10 OF 47 REFERENCES

Energy and the Scaling of Animal Space Use

TLDR
This study reveals how simple morphological traits and prey-handling ability can profoundly influence individual space use, which underpins broader-scale patterns in the spatial ecology of vertebrates.

Limits to maximal performance.

TLDR
Body size fundamentally affects maximal locomotor performance in mammals, which results in allometric relationships that make the energetic cost of locomotion more expensive for small mammals than for large mammals.

Muscle function and hydrodynamics limit power and speed in swimming frogs.

TLDR
Swimming speed and muscle function in the aquatic frog Xenopus laevis is examined to suggest that in drag-based aquatic systems, muscle-environment interactions vary with body size, limiting both the muscle's potential to produce power and the swimming speed.

The relation between maximal running speed and body mass in terrestrial mammals

TLDR
McMahon's (1975b) model for elastic similarity is therefore not supported by the available data on maximal running speeds, and there appears to be no necessary correspondence between scaling of limb bone proportions and running ability.

Optimal Body Size with Respect to Maximal Speed for the Yellow-Spotted Monitor Lizard (Varanus panoptes; Varanidae)

TLDR
A curvilinear relationship between body size and absolute maximal sprint speed with an optimal body mass is shown with respect to speed of 1.245 kg, supporting the biomechanical constraints hypothesis and excluding the phylogenetic inertia hypothesis.

Estimating dinosaur maximum running speeds using evolutionary robotics

  • W. SellersP. Manning
  • Environmental Science
    Proceedings of the Royal Society B: Biological Sciences
  • 2007
TLDR
Simple musculoskeletal models of three extant and five extinct bipedal species are presented and it is concluded that the values presented for the five extinct species are reasonable predictions given the modelling assumptions made.

Universal temperature and body-mass scaling of feeding rates

TLDR
These body-mass- and temperature-scaling models remain useful as a mechanistic basis for predicting the consequences of warming for interaction strengths, population dynamics and network stability across communities differing in their size structure.

Scaling migration speed in animals that run, swim and fly

TLDR
It is made that in runners and swimmers, selection for enhanced migration speed could provide an explanation to Cope's rule, i.e. the observation that body size gradually tends to increase over time.

Energetic and biomechanical constraints on animal migration distance.

TLDR
Data from over 200 species of migratory birds, mammals, fish, and invertebrates support the central conclusion of the model - that body size drives variation in maximum migration distance among species through its effects on metabolism and the cost of locomotion.