Morphological asymmetry of the abdomen and behavioral laterality in atyid shrimps
Morphological asymmetry of the abdomen and behavioral laterality in atyid shrimps
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DOI：
10.2108/zsj.25.355
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发表时间：
2008-04-01
影响因子：
0.9
通讯作者：
Hori, Michio
中科院分区：
文献类型：
--
作者：
Takeuchi, Yuichi;Tobo, Shoko;Hori, Michio
近年来，脊椎动物的形态不对称性和行为偏侧性得到了广泛的研究，而与之相对应的无脊椎动物的研究却很少。在这里，我们展示了腹部弯曲的不对称性和躲避反应的偏侧性，这两种虾分别是宽腹虾和齿新虾。两个种群腹弯角度的频率分布均呈离散双峰分布，表明两个种群均由左右型个体组成。用高速摄像进行的行为分析表明，每个个体由突然的非偏侧化肉芽引起的逃逸方向与其腹曲相关：左(右)型虾向后向左(-右)跳跃的频率显著高于向左(-右)型。与斜纹夜蛾杂交试验表明，左型亲本F_1代性状频率与右型亲本F_1代性状频率差异显著，不同偏侧型亲本F_1代性状频率不偏离随机性。也就是说，后代的偏侧类型受双亲的偏侧影响，这表明对虾的腹部二态是遗传起源的。这些结果表明，虾有一种与生俱来的偏侧性，控制着它们的逃逸方向，这反过来可能会影响水生群落中猎物和捕食者的相互作用。
Morphological asymmetry and behavioral laterality in vertebrate species have been intensively studied in recent years, while comparable invertebrate studies are rare. Here we demonstrate asymmetry in the curvature of the abdomen and laterality in evasive responses for two atyid shrimps, Limnocaridina latipes and Neocaridina denticulata. The frequency distributions of the angle of the abdominal curvature in both species were discretely bimodal, suggesting that the two populations are composed of both left- and right-type individuals. In N. denticulata, behavioral analysis using high-speed filming illustrated that the escape direction for each individual, evoked by a sudden non-lateralized stlimulus, was correlated with its abdominal curvature: left- (right-) type shrimp jumped back-leftward (-rightward) significantly more than often. A crossing experiment with N. denticulata indicated that the trait frequency in the F1 generation from two left-type parents differed significantly from that of the F1 generation from two right-type parents, and that the trait frequency for the F1 generation from parents of different laterality types did not deviate from random. That is, offspring laterality type is affected by the lateralities of the parents, indicating that abdominal dimorphism in shrimp is genetically derived. These results suggest that shrimp have an innate laterality that controls their escape direction, which in turn may affect prey-predator interactions in the aquatic community.