Matsui Shoko, Takeuchi Yuichi, Hori Michio
Department of Applied Biosciences, Kyoto University, Nagahama, Maizuru, Kyoto, Japan.
Zoolog Sci. 2013 Aug;30(8):613-8. doi: 10.2108/zsj.30.613.
Many animals show lateral bias in various behaviors. In fish, behavioral laterality has been studied from the perspective of its relation with brain lateralization. On the other hands, in some fishes, head dimorphism (righty or lefty) corresponds to behavioral laterality, such as foraging behavior. To examine the correlation between morphological asymmetry and behavioral laterality associated with brain lateralization, we conducted two behavioral tests (the detour test and fast-start test) using a poeciliid fish, Girardinus metallicus. In both behavioral tests, some individuals tended to move rightward, while others tended to move leftward, in a manner associated with head incline. In the detour-test, righty individuals primarily detoured leftward, whereas lefty individuals primarily detoured rightward. In the fast-start tests, the reverse tendency was seen; righty individuals tended to escape rightward, whereas lefty individuals tended to escape leftward. Such results indicate that brain lateralization may be also associated with morphological asymmetry.
许多动物在各种行为中表现出侧向偏好。在鱼类中，行为偏侧性已从其与大脑偏侧化的关系角度进行了研究。另一方面，在一些鱼类中，头部二态性（右向或左向）与行为偏侧性相对应，例如觅食行为。为了研究与大脑偏侧化相关的形态不对称性和行为偏侧性之间的相关性，我们使用一种食蚊鱼（Girardinus metallicus）进行了两项行为测试（迂回测试和快速启动测试）。在这两项行为测试中，一些个体倾向于向右移动，而另一些个体则倾向于向左移动，其方式与头部倾斜有关。在迂回测试中，右向个体主要向左迂回，而左向个体主要向右迂回。在快速启动测试中，观察到相反的倾向；右向个体倾向于向右逃避，而左向个体倾向于向左逃避。这些结果表明，大脑偏侧化可能也与形态不对称性有关。
