Evidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.

A reanalysis of existing data suggests that the established tenet of increasing efficiency of transport with body size in terrestrial locomotion requires re-evaluation. Here, the statistical model that described the data best indicated a dichotomy between the data for small (<1 kg) and large anim...

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Autores principales:	Robert L Nudds, Jonathan R Codd, William I Sellers
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2009
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1d6d0d4fe20d4526b9a5b21b77a0e8e2
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spelling	oai:doaj.org-article:1d6d0d4fe20d4526b9a5b21b77a0e8e22021-11-25T06:20:33ZEvidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.1932-620310.1371/journal.pone.0006927https://doaj.org/article/1d6d0d4fe20d4526b9a5b21b77a0e8e22009-09-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19738898/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203A reanalysis of existing data suggests that the established tenet of increasing efficiency of transport with body size in terrestrial locomotion requires re-evaluation. Here, the statistical model that described the data best indicated a dichotomy between the data for small (<1 kg) and large animals (>1 kg). Within and between these two size groups there was no detectable difference in the scaling exponents (slopes) relating metabolic (E(met)) and mechanical costs (E(mech, CM)) of locomotion to body mass (M(b)). Therefore, no scaling of efficiency (E(mech, CM)/E(met)) with M(b) was evident within each size group. Small animals, however, appeared to be generally less efficient than larger animals (7% and 26% respectively). Consequently, it is possible that the relationship between efficiency and M(b) is not continuous, but, rather, involves a step-change. This step-change in the efficiency of locomotion mirrors previous findings suggesting a postural cause for an apparent size dichotomy in the relationship between E(met) and M(b). Currently data for E(mech, CM) is lacking, but the relationship between efficiency in terrestrial locomotion and M(b) is likely to be determined by posture and kinematics rather than body size alone. Hence, scaling of efficiency is likely to be more complex than a simple linear relationship across body sizes. A homogenous study of the mechanical cost of terrestrial locomotion across a broad range of species, body sizes, and importantly locomotor postures is a priority for future research.Robert L NuddsJonathan R CoddWilliam I SellersPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 4, Iss 9, p e6927 (2009)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Robert L Nudds Jonathan R Codd William I Sellers Evidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.
description	A reanalysis of existing data suggests that the established tenet of increasing efficiency of transport with body size in terrestrial locomotion requires re-evaluation. Here, the statistical model that described the data best indicated a dichotomy between the data for small (<1 kg) and large animals (>1 kg). Within and between these two size groups there was no detectable difference in the scaling exponents (slopes) relating metabolic (E(met)) and mechanical costs (E(mech, CM)) of locomotion to body mass (M(b)). Therefore, no scaling of efficiency (E(mech, CM)/E(met)) with M(b) was evident within each size group. Small animals, however, appeared to be generally less efficient than larger animals (7% and 26% respectively). Consequently, it is possible that the relationship between efficiency and M(b) is not continuous, but, rather, involves a step-change. This step-change in the efficiency of locomotion mirrors previous findings suggesting a postural cause for an apparent size dichotomy in the relationship between E(met) and M(b). Currently data for E(mech, CM) is lacking, but the relationship between efficiency in terrestrial locomotion and M(b) is likely to be determined by posture and kinematics rather than body size alone. Hence, scaling of efficiency is likely to be more complex than a simple linear relationship across body sizes. A homogenous study of the mechanical cost of terrestrial locomotion across a broad range of species, body sizes, and importantly locomotor postures is a priority for future research.
format	article
author	Robert L Nudds Jonathan R Codd William I Sellers
author_facet	Robert L Nudds Jonathan R Codd William I Sellers
author_sort	Robert L Nudds
title	Evidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.
title_short	Evidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.
title_full	Evidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.
title_fullStr	Evidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.
title_full_unstemmed	Evidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.
title_sort	evidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.
publisher	Public Library of Science (PLoS)
publishDate	2009
url	https://doaj.org/article/1d6d0d4fe20d4526b9a5b21b77a0e8e2
work_keys_str_mv	AT robertlnudds evidenceforamassdependentstepchangeinthescalingofefficiencyinterrestriallocomotion AT jonathanrcodd evidenceforamassdependentstepchangeinthescalingofefficiencyinterrestriallocomotion AT williamisellers evidenceforamassdependentstepchangeinthescalingofefficiencyinterrestriallocomotion
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Evidence for a mass dependent step-change in the scaling of efficiency in terrestrial locomotion.

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