Shaffer H Bradley, Lauder George V
Committee on Evolutionary Biology and Department of Anatomy, University of Chicago, Chicago, IL, 60637.
Evolution. 1985 Jan;39(1):83-92. doi: 10.1111/j.1558-5646.1985.tb04081.x.
Patterns of variation in the feeding mechanism of three species of ambystomatid salamanders (Ambystoma dumerilii, A. mexicanum, and A. ordinarium) were studied to provide insight into the nature of variation in kinematic parameters of the jaw mechanism associated with prey capture. A nested analysis of variance design provided an assessment of the amount of variation in six kinematic variables (measured from 200 frames/sec films of feeding behavior) both among species and among individuals within species. For all six variables, a highly significant proportion of the variance was explained at the intraspecific level. Among species, the most robust discriminators were variables associated with movement of the hyoid. The variables reflecting gape and lifting of the head provided no significant discrimination among species and had large error variances. The hyoid apparatus is the most phylogenetically conservative component of the feeding mechanism in lower vertebrates and was the most stereotyped component of feeding behavior within the salamander species studied here.
研究了三种钝口螈属蝾螈（杜氏钝口螈、墨西哥钝口螈和普通钝口螈）进食机制的变异模式，以深入了解与捕食相关的颌部机制运动学参数的变异本质。方差设计的嵌套分析评估了六个运动学变量（从进食行为的每秒200帧影片中测量）在物种间和物种内个体间的变异量。对于所有六个变量，很大比例的方差在种内水平得到了解释。在物种间，最有力的区分变量是与舌骨运动相关的变量。反映张口和抬头的变量在物种间没有显著区分，且误差方差很大。舌骨装置是低等脊椎动物进食机制中在系统发育上最保守的组成部分，也是此处研究的蝾螈物种进食行为中最模式化的组成部分。
