Rapid response to changing light environments of the calanoid copepod<Emphasis Type="Italic"> Calanus sinicus</Emphasis> |
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| Authors: | T?Yoshida Email author" target="_blank">T?TodaEmail author V?Kuwahara S?Taguchi B?H?R?Othman |
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| Institution: | (1) School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Malaysia;(2) Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, 192-8577 Hachioji, Tokyo, Japan;(3) Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039-0628, USA |
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| Abstract: | Calanus sinicus is a large calanoid copepod and a dominant species in the coastal waters of Japan. During a research cruise in Sagami Bay on 18 June 1996, we found C. sinicus
performing an  unusual diel vertical migration (DVM), a behavior that has not been reported in previous studies on this species. This study examined the DVM of C.
sinicus under different light environments and revealed the copepod s characteristic response to light. Field and laboratory results show that the DVM of C.
sinicus is flexible and also confirmed its sensitivity and its rapid response to changing light environments. It is suggested that C. sinicus reacts to changes in absolute light intensity. This feature may be common in oceanic copepod species. The copepods quick reaction to light variation provides decreased predation risks and increased feeding opportunities, which make them a dominant survivor in coastal water habitats.Communicated by T. Ikeda, Hakodate |
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