Acquisition of Lateralized Predation Behavior Associated with Development of Mouth Asymmetry in a Lake Tanganyika Scale-Eating Cichlid Fish.
Acquisition of Lateralized Predation Behavior Associated with Development of Mouth Asymmetry in a Lake Tanganyika Scale-Eating Cichlid Fish.
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DOI：
10.1371/journal.pone.0147476
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Oda Y
中科院分区：
文献类型：
--
作者：
Takeuchi Y;Hori M;Tada S;Oda Y
嘴巴不对称的食鳞鱼是行为偏侧性的一个有吸引力的模型：每只成年鱼根据嘴巴倾斜的方向撕下猎物左翼或右翼的鳞片。为了研究行为偏侧性和口不对称性的发展，我们分析了坦噶尼喀湖采集的不同大小的小鳞鱼(22≤SL<；115 mm)的胃内容物和下颌骨不对称。在每个标本胃中发现的穿孔鳞片的形状表明了其攻击侧的偏好。主要摄食浮游动物的早期幼鱼标本(Sl<；45 mm)表现出轻微但明显的嘴巴不对称。随着鱼获得鳞片(45 mm≤SL)，攻击侧偏好逐渐增强，嘴巴不对称也是如此。在大小匹配的个体中，嘴巴歪斜的人吃的鳞片更多。这些发现表明，食鳞鱼的行为偏侧性与口腔不对称性的发展有关，口腔不对称性是行为习得之前的行为习得，这种身体和行为文字之间的协同作用可能有助于有效的食鳞率。
The scale-eating cichlid Perissodus microlepis with asymmetric mouth is an attractive model of behavioral laterality: each adult tears off scales from prey fishes’ left or right flanks according to the direction in which its mouth is skewed. To investigate the development of behavioral laterality and mouth asymmetry, we analyzed stomach contents and lower jaw-bone asymmetry of various-sized P. microlepis (22≤SL<115mm) sampled in Lake Tanganyika. The shapes of the pored scales found in each specimen’s stomach indicated its attack side preference. Early-juvenile specimens (SL<45mm) feeding mainly on zooplankton exhibited slight but significant mouth asymmetry. As the fish acquired scale-eating (45mm≤SL), attack side preference was gradually strengthened, as was mouth asymmetry. Among size-matched individuals, those with more skewed mouths ate more scales. These findings show that behavioral laterality in scale-eating P. microlepis is established in association with development of mouth asymmetry which precedes the behavioral acquisition, and that this synergistic interaction between physical and behavioral literalities may contribute to efficient scale-eating.