Visual image of neighbors to elicit wandering behavior in the soldier crab |
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| Authors: | Toru Moriyama Jun-ichi Mashiko Toshinori Matsui Koichiro Enomoto Tetsuya Matsui Kojiro Iizuka Masashi Toda Yukio Pegio Gunji |
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| Affiliation: | 1.Department of Bioengineering,Shinshu University,Ueda,Japan;2.Graduate School of Science and Technology,Niigata University,Niigata,Japan;3.Graduate School of Science and Technology,Kobe University,Kobe,Japan;4.Collage of Systems Engineering and Science,Shibaura Institute of Technology,Tokyo,Japan;5.Center for Management of Information Technologies,Kumamoto University,Kumamoto,Japan;6.School of Fundamental Science and Engineering,Waseda University,Tokyo,Japan |
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| Abstract: | The soldier crab appears in great numbers and feeds while wandering during daytime low tide. When they see an approaching object, they screw themselves into the sand. The mechanism of formation of mass wandering has not been clarified. In this study, to investigate if the soldier crabs use visual images of neighbors as a stimulus for wandering, dummy crabs were presented to crabs. In the experiments, one, two, four, or eight dummies were placed in a circle on a sand arena. Each crab was placed in the center of the arena and observed whether it burrowed into the sand or wandered. The proportions of wandering individuals in each experimental treatment were compared with the expected value. Significantly more crabs were wanderers when only two and four dummies were present. This result suggests that soldier crabs chose burrowing or wandering depending on visual image of the distribution of the neighbors. |
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