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Journal of Oceanography

, Volume 67, Issue 1, pp 47–58 | Cite as

Characteristics and regional classification of the copepod community in Ariake Bay with note on comparison with 3 decades ago

  • Roberta Beltrão
  • Michiko Monde
  • Hiroshi UedaEmail author
Original Article

Abstract

Ariake Bay, Kyushu Island, has recently exhibited environmental degradation in the form of red tides and anoxic bottom water. To determine the characteristics and regional classification of the copepod community, zooplankton surveys were made throughout the bay in three cruises each in October 2004, January 2005 and March 2009 by vertical tows of a 0.1-mm-mesh plankton net. Oithona davisae was the most abundant in January and March, and Microsetella norvegica in October. Cluster analysis revealed that the copepod community from each cruise was generally separated into the inner to eastern-middle region and the western-middle to mouth region. A SIMPER analysis revealed that dissimilarity between the groups and similarity within each group were mainly due to the dominant species, but the similarities within the outer-region group in January and March were mostly contributed by Paracalanus parvus s.l. A non-metric multidimensional scaling with bubble plots of environmental variables and a BIOENV analysis showed that transparency was more different between the two groups than temperature and salinity. As compared with two similarly sized, eutrophic bays (Tokyo and Osaka Bays), Ariake Bay differs from Tokyo Bay in the dominance of M. norvegica and from Osaka Bay in the high abundance of O. davisae even in the colder season. The dominant species and the regional classification of the copepod community in the bay were similar to those in the studies in the 1970s, suggesting that the copepod community has not notably changed during the last 3 decades.

Keywords

Ariake Bay Copepod community Spatial distribution Oithona davisae Microsetella norvegica Transparency Cluster analysis Decadal change 

Notes

Acknowledgments

We thank Dr. Masaru Tanaka of Kyoto University for providing the opportunity to carry out the present study, Drs. Shuhei Nishida and Atsushi Tsuda of the University of Tokyo for their useful suggestions, Dr. Gyo Itani of Kochi University for his help with data analysis, and Dr. Izumi Kinoshita of Kochi University, the staff of Nishinihon Institution of Technology, Inc., and students of HU’s former laboratory at Ehime University for their help with the field work. We are grateful to the Saga Prefectural Ariake Fisheries Research and Development Center for supporting our sampling. Thanks are also due to Dr. Gabrielle Prendergast for correcting the English. This study was funded in part by Grants-in-aid from the Ministry of Education, Science, Sports and Culture of Japan (nos. 15208019 and 20580203).

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Copyright information

© The Oceanographic Society of Japan and Springer 2011

Authors and Affiliations

  1. 1.Usa Marine Biological InstituteKochi UniversityTosaJapan
  2. 2.Graduate School of Science and EngineeringEhime UniversityMatsuyamaJapan

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