Effect of substrate on the locomotion behaviour of the South American iguanian lizard Polychrus acutirostris

摘要: Abstract Arboreal and terrestrial habitats impose different constraints on tetrapod locomotion. We studied Polychrus acutirostris, a tree-dwelling lizard that also moves the ground, in order to evaluate effects of support incline diameter locomotion parameters. Limb movements six specimens were filmed quantify kinematic variables (velocity, stride frequency, length, limb coordination) distinct perch diameters (4.0, 1.5, 0.8 cm) inclines (90°, 45°, level ground). The results show notable slowness arboreal habitat combined with relatively fast when using ground as temporary habitat. These animals developed walking trots mainly lateral sequence. Non-symmetrical adopted at highest velocities indicate difficulties “accommodation” imposed by this condition. Velocity generally decreases decreasing diameter, increasing incline, supports. Slowness, gaits favouring body...