Locomotor performance of closely related Tropidurus species: relationships with physiological parameters and ecological divergence

Kohlsdorf, T., James, R. S., Carvalho, J. E., Wilson, R. S., Dal Pai-Silva, M. and Navas, C. A. (2004) Locomotor performance of closely related Tropidurus species: relationships with physiological parameters and ecological divergence. Journal of Experimental Biology, 207 7: 1183-1192. doi:10.1242/jeb.00870

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Author Kohlsdorf, T.
James, R. S.
Carvalho, J. E.
Wilson, R. S.
Dal Pai-Silva, M.
Navas, C. A.
Title Locomotor performance of closely related Tropidurus species: relationships with physiological parameters and ecological divergence
Journal name Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1242/jeb.00870
Open Access Status File (Publisher version)
Volume 207
Issue 7
Start page 1183
End page 1192
Total pages 10
Editor R.G. Boutilier
Place of publication Cambridge
Publisher Company of Biologists Ltd
Collection year 2004
Language eng
Subject C1
270604 Comparative Physiology
270700 Ecology and Evolution
780105 Biological sciences
Abstract Tropidurid lizards have colonized a variety of Brazilian open environments without remarkable morphological variation, despite ecological and structural differences among habitats used. This study focuses on two Tropidurus sister-species that, despite systematic proximity and similar morphology, exhibit great ecological divergence and a third ecologically generalist congeneric species providing an outgroup comparison. We quantified jumping capacity and sprint speed of each species on sand and rock to test whether ecological divergence was also accompanied by differences in locomotor performance. Relevant physiological traits possibly associated with locomotor performance metabolic scopes and fiber type composition, power output and activity of the enzymes citrate synthase, pyruvate kinase and lactate dehydrogenase of the iliofibularis muscle - were also compared among the three Tropidurus species. We found that the two sister-species exhibited remarkable differences in jumping performance, while Tropidurus oreadicus, the more distantly related species, exhibited intermediate values. Tropidurus psamonastes, a species endemic to sand dunes, exhibited high absolute sprint speeds on sand, jumped rarely and possessed a high proportion of glycolytic fibers and low activity of citrate synthase. The sister-species Tropidurus itambere, endemic to rocky outcrops, performed a large number of jumps and achieved lower absolute sprint speed than T. psamonastes. This study provides evidence of rapid divergence of locomotor parameters between sister-species that use different substrates, which is only partially explained by variation in physiological parameters of the iliofibularis muscle.
Keyword Biology
Locomotion
Tropidurus
Muscle Physiology
Metabolism
Enzyme Activity
Habitat Divergence
Evolution
Lizard Dipsosaurus-dorsalis
Skeletal-muscles
Evolutionary Relationships
Terrestrial Locomotion
Fiber Composition
Mechanical Power
In-vivo
Adaptation
Morphology
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 13:08:46 EST