Laboratory observations of habitat selection in aestivating and active adult sea cucumber <Emphasis Type="Italic">Apostichopus japonicus</Emphasis> |
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Authors: | Yusuke Yamana Tatsuo Hamano Seiji Goshima |
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Institution: | (1) Graduate School of Fisheries Sciences, Hokkaido University, Hakodate Hokkaido, 041-8611, Japan;(2) Department of Applied Aquabiology, National Fisheries University, Shimonoseki Yamaguchi, 759-6595, Japan;(3) Faculty of Fisheries Sciences, Hokkaido University, Hakodate Hokkaido, 041-8611, Japan;(4) Present address: Wakayama Prefectural Museum of Natural History, Kainan Wakayama, 642-0001, Japan |
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Abstract: | In order to verify which factors affect habitat selection for aestivating and in the active adult Apostichopus japonicus, animals were tested for their selection of attachment site in an experimental device (1-m pipes) in which the perceived
environmental stimuli (light intensity, degree of contact with a hard surface, geotaxis) varied depending on the attachment
site. During the aestivating season, the animals showed a strong selection for attachment sites during the daytime and nighttime;
they also showed positive stereotaxis (thigmotaxis), negative phototaxis, and negative geotaxis. The results suggest that
(1) habitats are not suitable for the aestivating adult A. japonicus unless these three environmental requirements are satisfied. |
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