Comparative and behavioral analyses of preferred speed: Anolis lizards as a model system.
I quantified the movement patterns of eight morphologically and ecologically diverse Caribbean Anolis lizard species in the field to address the following questions: (1) Do these eight species move at preferred speeds, and if so, what are these speeds? (2) What proportion of their maximum sprinting capacities do the anole species use when moving undisturbed? (3) What percentage of the time do lizards spend moving, and how far do they typically travel on a daily basis? (4) Have the preferred speeds of anoles coevolved with structural habitat use? Most of the distributions of speeds were highly skewed, with a preponderance of slow-speed locomotion (<20% of maximum capacity). Median speeds varied almost eightfold among species, from a low of 4.9 cm/s (3.0% of maximum) to a high of 38.0 cm/s (22.4% of maximum). For all eight species, at least 75% of their locomotor movements took place between 0% and 40% of maximum capacity. The eight species varied almost 15-fold in the percentage of time they spent moving, indicating that not all anole species are equally sedentary. Through usage of modern comparative methods, I showed that Anolis species that move slowly through their environments also tend to use narrow perch diameters and have large habitat breadths. These findings show how evolutionary approaches can be profitably integrated with physiological data to understand how species use their habitats.
Irschick
D J
DJ
Department of Integrative Biology, University of California at Berkeley, Berkeley, CA 94720, USA. duncange@socrates.berkeley.edu
D000818:Animals; D008116:Lizards / Q000145:classification / Q000502:physiology*; D008124:Locomotion / Q000502:physiology*; D010802:Phylogeny; D013045:Species Specificity