Summary
Metabolic rate scales with body mass to the three-quarter power, described by Kleiber's law.
In depth
Basal metabolic rate scales with mass^0.75 across animals, so small animals have higher mass-specific rates and shorter lifespans; explanations involve fractal-like distribution networks. A mouse's heart beats about 600 times a minute, an elephant's 30.
Allometry describes size-related changes. Scaling arises from supply network geometry. Exceptions occur.
Remember: mass-specific metabolic rate falls with body size.
Frequently asked questions
What is Metabolic Scaling?
Metabolic rate scales with body mass to the three-quarter power, described by Kleiber's law.
Which area of biology covers Metabolic Scaling, and how advanced is it?
Metabolic Scaling is one of the 53 topics in Zoology & Animal Diversity. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Island Gigantism and Dwarfism, Hibernation and Torpor, Sexual Dimorphism.
Can you give an example of Metabolic Scaling?
Shrews must feed almost constantly.
What should I learn before Metabolic Scaling?
Work through the Beginner topics in Zoology & Animal Diversity first, such as Animal Kingdom, Vertebrates and Invertebrates, Sponges, then return to Metabolic Scaling. Advanced topics assume the Intermediate vocabulary.
What topics are related to Metabolic Scaling?
The closest topics to Metabolic Scaling are Island Gigantism and Dwarfism, Hibernation and Torpor, Sexual Dimorphism, Bioluminescence. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Metabolic Scaling?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Metabolic Scaling. To practise the whole of Zoology & Animal Diversity, use the Zoology & Animal Diversity quiz.
How is Metabolic Scaling different from Island Gigantism and Dwarfism?
Metabolic Scaling: Metabolic rate scales with body mass to the three-quarter power, described by Kleiber's law. Island Gigantism and Dwarfism: Isolated animals tend to evolve larger or smaller sizes depending on resources and predators. Read both side by side and note what each one explains.
How should I study Metabolic Scaling step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Island Gigantism and Dwarfism and explain the difference aloud. Finally, take the Zoology & Animal Diversity quiz and come back to this page for any question you miss.