Speed of back-swimming of Lymnaea

Aono, Kanako and Fusada, A. and Fusada, Y. and Ishii, W. and Kanaya, Y. and Komuro, Mami and Matsui, Kanae and Meguro, S. and Miyamae, Ayumi and Miyamae, Yurie and Murata, Aya and Narita, Shizuka and Nozaka, Hiroe and Saito, Wakana and Watanabe, Ayumi and Nishikata, Kaori and Kanazawa, A. and Fujito, Y. and Okada, R. and Lukowiak, K. and Ito, E. (2008) Speed of back-swimming of Lymnaea. Acta Biologica Hungarica, 59 (Supple). pp. 105-109. ISSN 0236-5383

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The pond snail, Lymnaea stagnalis , can locomote on its back utilizing the surface tension of the water. We have called this form of movement ‘back-swimming’. In order to perform this behavior, the snail must flip itself over on its back so that its foot is visible from above. Little is known about the mechanism of this back-swimming. As a first step for the elucidation of this mechanism, we measured the speed of back-swimming of Lymnaea at the different times of the day. They back-swam significantly faster in the morning than just before dark. These data are consistent with our earlier findings on circadian-timed activity pattern in Lymnaea. Lymnaea appear to secrete a thin membrane-like substance from their foot that may allow them to back-swim. To confirm the existence of this substance and to examine whether this substance is hydrophobic or hydrophilic, we applied a detergent onto the foot during back-swimming. A single drop of 1% Tween 20 drifted Lymnaea away that were still kept at the water surface. These results suggest that Lymnaea secrete a hydrophobic substance from their foot that floats to the water surface allowing Lymnaea to back-swim.

Item Type: Article
Subjects: Q Science / természettudomány > QH Natural history / természetrajz
Depositing User: Endre Sarvay
Date Deposited: 20 Nov 2017 16:20
Last Modified: 20 Nov 2017 16:20

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