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Diel changes in vertical distribution of copepods community in Tanabe Bay, Japan

Published online by Cambridge University Press:  24 May 2004

Shinji Shimode  and
Yoshihisa Shirayama
Shinji Shimode
Affiliation:
Graduate School of Environmental and Information Sciences, Yokohama National University, 79-2 Tokiwadai, Hodogaya, Yokohama, 240-8501, Japan
Yoshihisa Shirayama
Affiliation:
Seto Marine Biological Laboratory, Graduate School of Sciences, Kyoto University, 459 Shirahama, Nishimuro, Wakayama, 649-2211, Japan
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Abstract

Diel vertical migration (DVM) and distributional patterns of copepods collected in the water column at shallow water site (Station M) in Tanabe Bay, Japan were investigated. Twenty-one taxa of zooplankton and 48 species of copepods at Station M had positive ΔZ values (subtraction of night-time weighted mean depth from daytime value) and performed normal DVM. The highest ΔZ value was 4·3 observed in Ambunguipes rufocincta. Three taxa and 39 species collected only at night also had high WMD (weighted mean depth) values (4·0∼7·5), which were previously considered hyperbenthic species. Statistically significant differences were found only in Myodocopina spp., Calocalanus plumulosus and Clausocalanus spp. Myodocopina spp. and Clausocalanus spp. showed downward migration at low to high and high tidal phases. Calocalanus plumulosus and some copepods performed downward migration during high and high to low tidal phases. Four distributional patterns of copepod species in Tanabe Bay were found. The groups are as follows: (A) true planktonic group; (B) swarming and night emerging group; (C) night emerging meiobenthic and hyperbenthic group; (D) symbiotic and night emerging group.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 84 , Issue 3 , June 2004 , pp. 607 - 615
Copyright
2004 Marine Biological Association of the United Kingdom

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