Diel variation of zooplankton in the tropical coral-reef water of Tioman Island, Malaysia
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Zooplankton was sampled at 3-h intervals for a 48-h period from a coral reef of Tioman Island, Malaysia. It was size-fractionated into three size classes: 100–200, 200–335, and >335 μm using different sieves with different mesh sizes. Total zooplankton (>100 μm) abundance and biomass in the water column were high later at night (0300 h), not just after sunset as previously described in other studies. Only the largest size-fraction (>335 μm) of zooplankton significantly differed in biomass and abundance between day and night. The increase in the large zooplankton later in the night is suggested to be caused by the advection of pelagic species into the reef. This work has provided a measurement of the variation of zooplankton community over coral reef that can exist on a scale of hours.
KeywordsDay/night change Size-fraction Copepods Pelagic Reef associated
The research project “Studies of coral reef ecosystem biodiversity in the Malaysian waters” was supported by the Japan Society for the Promotion of Science (JSPS) and Vice Chancellor’s Council (VCC) in Malaysia. We thank Dr. M. Terazaki, Sanyo Techno Marine Inc., for his assistance and financial support. We are grateful to F. L. Alice Ho, M. Y. Ng, and S. P. Kok for help in field sampling and W. Kinjyo, A. Takamoto, and A. Nakayama for help in microscopic analysis and providing maps of the study area. Our thanks are also due to Dr. S. Shimode, Ocean Research Institute, The University of Tokyo for valuable suggestions and F. L. Wee, R. M. Yana, and members of Marine Park Section, Department of Fisheries, Malaysia. We also would like to express our appreciation to Dr. R. D. Gulati, Netherland Institute of Ecology for polishing the manuscript. This research was partially funded by JSPS and Universiti Kebangsaan Malaysia Research Grant UKM-GUP-ASPL-08-04-231.
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