103-9 Sat Jan 2 Choose your own adventure: Performance and kinematics of multiple climbing and swimming strategies in lizards Cheu, AY*; Bergmann, PJ; Clark University; Clark University acheu@clarku.edu http://Basiliskos.com
Based on the physical composition of their environment, animals are often required to perform various modes of locomotion. However, within each mode there may be several different strategies that an animal can employ. It is unknown whether these strategies differ in the level of performance and how such potential differences are mediated by body and limb kinematics. Such performance differences may have behavioral and ecological implications where, for example, if one strategy had a higher velocity and the other has higher acceleration an animal may use the former to pursue prey and the latter to escape predators. In basilisk lizards (Basiliscus vittatus), climbing can be achieved with either the limbs being used synchronously, akin to hopping up a vertical surface, or asynchronously, where the left and right hind limbs are out of phase. In swimming locomotion, these lizards will often perform swimming by axial undulation with their limbs folded against their body, but they can also adopt paraxial swimming, using their hindlimbs to kick. Here we address the question: How do the different strategies within each mode of locomotion differ in their performance and kinematics? This study aims to address (1) if the maximum and average velocities and accelerations and axial kinematic variables differ between synchronous versus asynchronous gaits in climbing and between paraxial and axial swimming strategies and (2) if higher performance in one strategy correlates with increased frequency of use of that strategy over the other.