Bisazza A, Cantalupo C, Vallortigara G
Dipartimento di Psicologia Generale, Università di Padova, Italy.
Physiol Behav. 1997 Jan;61(1):31-5. doi: 10.1016/s0031-9384(96)00308-3.
Lateral asymmetries in the direction of turning during escape behavior in a species of teleost fish, Jenynsia lineata, are reported. When faced with the visual image of a simulated predator, approximately half of the individuals exhibited a significant bias to turn rightwards or leftwards, and the asymmetry tended to be retained when the same fish were retested 1 month later. Some morphological characters (pectoral fin rays, scales in natural row, supraorbital, preopercular, and postotic pores) were measured to check whether the degree of behavioral asymmetry was correlated with morphological fluctuating asymmetries associated with environmental stress or reduced heterozygosis. The results showed that it was not. The implications of these results for the interpretation of behavioral lateralization at the individual and population level are discussed.
据报道，在一种硬骨鱼——细纹珍妮丽鱼的逃避行为中，转向方向存在侧向不对称性。当面对模拟捕食者的视觉图像时，大约一半的个体表现出显著的向右或向左转向偏好，并且当对同一条鱼在1个月后重新测试时，这种不对称性往往会保留下来。测量了一些形态特征（胸鳍鳍条、自然排中的鳞片、眶上孔、前鳃盖骨孔和耳后孔），以检查行为不对称程度是否与与环境压力或杂合性降低相关的形态波动不对称性相关。结果表明并非如此。讨论了这些结果对个体和群体水平行为侧化解释的意义。
