Deban Stephen M, O'Reilly James C
Museum of Vertebrate Zoology and Department of Integrative Biology, 3101 Valley Life Sciences Building #3160, University of California, Berkeley, CA 94720-3160, USA.
Zoology (Jena). 2005;108(2):155-67. doi: 10.1016/j.zool.2005.03.006.
Studies of the scaling of feeding movements in vertebrates have included three species that display both near-geometric growth and isometry of kinematic variables. These scaling characteristics allow one to examine the "pure" relationship of growth and movement. Despite similar growth patterns, the feeding movements of toads (Bufo) slow down more with increasing body size than those of bass (Micropterus), and sharks (Ginglymostoma). This variation might be due to major differences in the mechanism of prey capture; the bass and sharks use suction to capture prey in water, while the toad uses tongue prehension to capture prey on land. To investigate whether or not these different scaling patterns are correlated with differences in feeding mechanics, we examined the ontogenetic scaling of prey capture movements in the hellbender salamander (Cryptobranchus alleganiensis), which also has near-geometric growth. The hellbender suction feeds in the same general manner as the teleosts and shark, but is much more closely related to the toad. The feeding movements of the hellbender scale more similarly to the feeding movements of toads than to those of fishes or sharks, indicating that phylogenetic relatedness rather than biomechanical similarity predicts ontogenetic scaling patterns of movement.
对脊椎动物摄食运动缩放比例的研究涵盖了三种既呈现近似几何生长又具有运动学变量等比关系的物种。这些缩放特征使人们能够研究生长与运动之间的“纯粹”关系。尽管生长模式相似，但蟾蜍（Bufo）的摄食运动随体型增大比鲈鱼（Micropterus）和鲨鱼（Ginglymostoma）的摄食运动减缓得更多。这种差异可能是由于猎物捕获机制的重大不同；鲈鱼和鲨鱼利用吸力在水中捕获猎物，而蟾蜍则利用舌头抓取在陆地上的猎物。为了研究这些不同的缩放模式是否与摄食力学的差异相关，我们研究了隐鳃鲵（Cryptobranchus alleganiensis）猎物捕获运动的个体发育缩放比例，隐鳃鲵也具有近似几何生长。隐鳃鲵以与硬骨鱼和鲨鱼大致相同的方式进行吸力摄食，但与蟾蜍的关系更为密切。隐鳃鲵的摄食运动与蟾蜍的摄食运动缩放比例更为相似，而与鱼类或鲨鱼的不同，这表明系统发育相关性而非生物力学相似性预测了运动的个体发育缩放模式。
