Jaw laterality and related handedness in the hunting behavior of a scale-eating characin, Exodon paradoxus.
Jaw laterality and related handedness in the hunting behavior of a scale-eating characin, Exodon paradoxus.
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DOI：
10.1371/journal.pone.0029349
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Hori M
中科院分区：
文献类型：
--
作者：
Hata H;Yasugi M;Hori M
动物身体和行为的不对称性已经进化了好几次，但我们对它们之间的联系的了解有限。坦噶尼喀鳞鳞慈鲷的身体和行为具有众所周知的反对称性;个体张开嘴巴时，右撇子总是攻击猎物的右侧，而左撇子则攻击左侧。本研究分析了一种食鳞字形目异齿龙的形态不对称性及其利手行为。每八个E。在水族箱中用猎物金鱼观察奇异金鱼1小时，以检测行为利手性。在实验之后，分析了这八个和十个额外的标本的下颌骨和头倾角的横向差异。两种方法对形态的测量结果均呈双峰分布，且在同一个体内，两种方法确定的偏侧性始终一致，表明该性状具有形态反对称性。此外，这种偏侧性显着对应的行为利手，也就是说，左撇子更经常锉鳞片从右侧的猎物，反之亦然。然而，偏侧性和利手性之间的相关性与慈鲷相反。这是由于饲养设备和技术的差异。在前上颌骨的外侧有尖齿向前，它从猎物的侧面将其身体的优势侧从其身体轴线向外推，以撕下鳞片。相比之下，慈鲷类将它们占优势的身体一侧向内拉向轴线，或者旋转它，用张开的嘴里排列的牙齿刮或拧掉鳞片。本研究表明，两个食鳞鱼类谱系的外部形态的反对称性和相应的行为利手性都是独立进化而来的，并且这两个谱系的鱼类利用身体的不对称性采取了不同的方式来撕下鳞片。
Asymmetry in animal bodies and behavior has evolved several times, but our knowledge of their linkage is limited. Tanganyikan scale-eating cichlids have well-known antisymmetry in their bodies and behavior; individuals open their mouths leftward (righty) or rightward (lefty), and righties always attack the right flank of the prey, whereas lefties attack the left. This study analyzed the morphological asymmetry in a scale-eating characiform, Exodon paradoxus, and its behavioral handedness. Each eight E. paradoxus was observed for 1-h with a prey goldfish in an aquarium to detect the behavioral handedness. Following the experiment, the lateral differences in the mandibles and head-inclination of these eight and ten additional specimens were analyzed. Both measurements on the morphology showed a bimodal distribution, and the laterality identified by these two methods was always consistent within a given individual, indicating that the characin has morphological antisymmetry. Furthermore, this laterality significantly corresponded to behavioral handedness; that is, lefties more often rasped scales from the right flank of the prey and vice versa. However, the correlation between laterality and handedness is the opposite of that in the cichlids. This is due to differences in the feeding apparatus and technique. The characin has cuspids pointing forward on the external side of the premaxilla, and it thrusts its dominant body side outward from its body axis on the flank of the prey to tear off scales. By contrast, the cichlids draw their dominant body side inward toward the axis or rotate it to scrape or wrench off scales with the teeth lined in the opened mouth. This study demonstrated that the antisymmetry in external morphology and the corresponding behavioral handedness have evolved in two lineages of scale-eating fishes independently, and these fishes adopt different utilization of their body asymmetry to tear off scales.
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影响因子：
2.9
作者：
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通讯作者：
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