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Caenorhabditis elegans transfers across a gap under an electric field as dispersal behavior
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| Title: | Caenorhabditis elegans transfers across a gap under an electric field as dispersal behavior |
| Other Titles: | 線虫Caenorhabditis elegansの電場を利用した分散行動に関する研究 |
| Authors: | 千葉, 拓也 Browse this author |
| Issue Date: | 25-Mar-2024 |
| Publisher: | Hokkaido University |
| Abstract: | Interactions between different animal species are a critical determinant of each species’ evolution and range expansion. Chemical, visual, and mechanical interactions have been abundantly reported, but the importance of electric interactions is not well understood. Here, I report the discovery that the nematode Caenorhabditis elegans transfers across electric fields to achieve phoretic attachment to insects. First, I found that dauer larvae of C. elegans nictating on a substrate in a Petri dish moved directly to the lid through the air due to the electrostatic force from the lid. To more systematically investigate the transfer behavior, I constructed an assay system with well-controlled electric fields: the worms flew up regardless of whether a positive or negative electric field was applied, suggesting that an induced charge within the worm is related to this transfer. The mean take-off speed is 0.86 m/s, and the worm flies up under an electric field exceeding 200 kV/m. This worm transfer occurs even when the worms form a nictation column composed of up to 100 worms; I term this behavior “multi-worm transfer.” These observations led us to conclude that C. elegans can transfer and attach to the bumblebee Bombus terrestris, which was charged by rubbing with flower pollen in the lab. The charge on the bumblebee was measured with a coulomb meter to be 806 pC, which was within the range of bumblebee charges and of the same order of flying insect charges observed in nature, suggesting that electrical interactions occur among different species. |
| Conffering University: | 北海道大学 |
| Degree Report Number: | 甲第15793号 |
| Degree Level: | 博士 |
| Degree Discipline: | ソフトマター科学 |
| Examination Committee Members: | (主査) 教授 中垣 俊之, 教授 芳賀 永, 准教授 佐藤 勝彦, 助教 西上 幸範 |
| Degree Affiliation: | 生命科学院（ソフトマター専攻） |
| Type: | theses (doctoral) |
| URI: | http://hdl.handle.net/2115/92336 |
| Appears in Collections: | 課程博士 (Doctorate by way of Advanced Course) > 生命科学院(Graduate School of Life Science)
学位論文 (Theses) > 博士 （ソフトマター科学）
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