SYMPOSIUM Locomotion, Energetics, Performance, and Behavior: A Mammalian Perspective on Lizards, and Vice Versa
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چکیده
15 Some of the constraints related to locomotion and activity metabolism can be illustrated through allometric comparisons of mammals and lizards, as representative terrestrial vertebrate endotherms and ectotherms, respectively, because these lineages differ greatly in aerobic metabolic capacities, resting energetic costs, and thermoregulatory patterns. Allometric comparisons are both useful and unavoidable, but “outlier” species (unusual for their clade) can also inform evolutionary scenarios, as they help indicate extremes of possible adaptation within mammalian and saurian levels of organization. We compared
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Locomotion, Energetics, Performance, and Behavior: A Mammalian Perspective on Lizards, and Vice Versa.
SYNOPSIS Animals are constrained by their abilities and by interactions with environmental factors, such as low ambient temperatures. These constraints range from physical impossibilities to energetic inefficiencies, and may entail trade-offs. Some of the constraints related to locomotion and activity metabolism can be illustrated through allometric comparisons of mammals and lizards, as repres...
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Locomotor performance and activity energetics were analyzed in 19 individual helodermatid lizards ranging in mass from 24.5-1220 g. We measured maximum sprint speeds, endurance on a treadmill, cost of transport, and aerobic capacity (rO2max) at a mean body temperature of 30.8 C. The maximum sprint speed for both Heloderma species averaged 1.7 km/h, which is among the lowest recorded for lizards...
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Lizards bend their trunks laterally with each step of locomotion and, as a result, their locomotion appears to be fundamentally different from mammalian locomotion. The goal of the present study was to determine whether lizards use the same two basic gaits as other legged animals or whether they use a mechanically unique gait due to lateral trunk bending. Force platform and kinematic measuremen...
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All animal behavior involves movement, and most behavior involves locomotion, i.e., the act of self-propulsion. Arguably, “Locomotion, movement through the environment, is the behavior that most dictates the morphology and physiology of animals” (Dickinson et al. 2000). In other words, natural and sexual selection often act on locomotor performance abilities because they are crucial to success ...
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All animal behavior involves movement, and most behavior involves locomotion, i.e., the act of self-propulsion. Arguably, “Locomotion, movement through the environment, is the behavior that most dictates the morphology and physiology of animals” (Dickinson et al. 2000). In other words, natural and sexual selection often act on locomotor performance abilities because they are crucial to success ...
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