Physiological correlates of locomotory performance in a lizard: an allometric approach
Abstract
Three measures of locomotory performance and a series of variables thought to affect performance were measured in the iguanid lizard Ctenosaura similis. Burst speed is mass independent; however, endurance time at 1 km/h (EN-DUR) and maximal distance run (MAX DIS) scale as M0.3. Standard and maximal rates of O2 consumption (VO2max) scale as M0.9; VO2max averages 10-fold greater than standard metabolic rate (SMR). Three of ten enzyme activities measured exhibit significant scaling. After statistically removing the effects of body mass, multiple-regression analysis indicates that 1) 89% of the residual variation in ENDUR is correlated with variation among individuals in thigh muscle mass, VO2max, heart mass, and liver citrate synthase (CS) activity; 2) maximal CO2 consumption (VCO2max) and thigh pyruvate kinase activity statistically explain 64% of the variation in MAX DIS; 3) heart and liver masses together predict 35% of the variation in SMR; 4) thigh and liver CS activity, heart lactate dehydrogenase (LDH) activity, and hematocrit account for 67% of the variation in VO2max;5) 97% of the variation in VCO2max is statistically related to variation in liver CS activity, thigh and heart masses, and heart LDH activity.
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Inclusion of large herbivores in recent BMR scaling studies increases the coefficient of variation of the relationship and increases the scaling exponent.
“A comparison of recent BMR scaling studies (since 1984) reveals that the inclusion of large herbivores both increases the coefficient of variation of the relationship (the standard deviation of ln-ln residuals; Garland, 1984) and increases the scaling exponent (Fig. •1).”
From Allometric scaling of mammalian metabolism (2005) · cites this paper as Garland, 1984
The percentage of large herbivores in a BMR data set is significantly correlated with the coefficient of variation and scaling exponent of the allometric relationship between BMR and body mass.
“Relationship between the percentage of large herbivores in a basal metabolic rate (BMR) data set and the coefficient of variation (CV, the standard deviation of residuals from a ln-ln allometric relationship;Garland, 1984) and scaling exponent (shown ±95% CI) of the allometric relationship between BMR and body mass.Both correlations are significant (CV: r=0.92,P<0.0001; scaling exponent: r=0.85,P=”
From Allometric scaling of mammalian metabolism (2005) · cites this paper as Garland, 1984
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Allometric scaling of mammalian metabolism
White, C. R., & Seymour, R. S. (2005) · Journal of Experimental Biology · doi:10.1242/jeb.01501 · Cited by 433 · see citing works
Determinants of the Postfeeding Metabolic Response of Burmese Pythons, <i>Python molurus</i>
Secor, S. M., & Diamond, J. (1997) · Physiological Zoology · doi:10.1086/639578 · Cited by 176 · see citing works
Kirkton, S. D., Niska, J. A., & Harrison, J. F. (2005) · Journal of Experimental Biology · doi:10.1242/jeb.01747 · Cited by 48 · see citing works
- Authors
- Garland, T.
- Corresponding author
- Garland, T.
- ORCID
- Garland, T.
- Venue
- American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
- Publisher
- American Physiological Society
- Published
- 1984-11-01
- Volume
- 247
- Issue
- 5
- Pages
- R806-R815
- ISSN
- 0363-6119 (ISSN-L)
- 1522-1490
- OpenAlex
- W1784388397
- Cited by
- 219
- References
- 0
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 1 · 2023: 7 · 2022: 6 · 2021: 4 · 2020: 5 · 2019: 1 · 2018: 5 · 2017: 4 · 2016: 3 · 2015: 4 · 2014: 2 · 2013: 6 · 2012: 5
- FWCI
- 9.03
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- American Journal of Physiology-Regulatory, Integrative and Comparative Physiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Ecology › Physiological and biochemical adaptations
- Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
- Physical Sciences › Environmental Science › Global and Planetary Change › Amphibian and Reptile Biology
- Keywords
- Ctenosaura similis, allometry, body mass scaling, endurance time, burst speed, oxygen consumption, standard metabolic rate, citrate synthase, pyruvate kinase, lactate dehydrogenase, cardiac mass, liver mass, thigh muscle mass, hematocrit
- MeSH terms
- Adenosine Triphosphatases, Animals, Body Constitution, Body Temperature, Citrate (si)-Synthase, Energy Metabolism, Physical Exertion, Hematocrit, L-Lactate Dehydrogenase, Liver, Lizards, Motor Activity, Myofibrils, Pyruvate Kinase
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