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Vertical distribution, population structure and lifecycle of Eucalanus bungii (Copepoda: Calanoida) in the Oyashio region, with notes on its regional variations

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Abstract

Vertical distribution and population structure of Eucalanus bungii were investigated at site H in the Oyashio region (western subarctic Pacific) from September 1996 through October 1997 to evaluate the species’ lifecycle pattern and associated ontogenetic vertical migration. Additional temporary samplings were also made at several stations covering the entire subarctic Pacific, Okhotsk Sea and Japan Sea, as a basis for regional comparison of lifecycle features of this species. At site H, a marked phytoplankton bloom occurred from mid-March to June, and E. bungii spawned in April/May in the surface layer. Resulting nauplii and copepodite stage 1 (C1) formed a prominent abundance peak in early June. The C1 developed and reached C5 by August. The development of nauplii through C4 occurred in the surface layer. From August onwards, C5 and a small fraction of C3–C4 sank gradually deeper, and entered diapause to overwinter at >500 m depth. The C5 molted to C6 males and females in February and March, respectively. The C6 males and females mated at 250–500 m depth, and only mated C6 females ascended to the surface layer in April for spawning. Judging from the size of lipid droplets in the body, the C3–C5 specimens deposited lipids in the body through the phytoplankton bloom period, and the lipids were consumed gradually during overwintering. Taking account of sampling season, temporal changes in population structure, and vertical distribution, the data collected from the western subarctic Pacific and Okhotsk Sea are consistent with a 1-year lifecycle for the site H population, while the data from the central and eastern subarctic Pacific were consistent with a 2-year lifecycle. The populations from the southern and southeastern Japan Sea did not fit the features of either lifecycle scenario, and because of their very small population size it is suggested that they originated from the northern Japan Sea. Regional comparison of the prosome length of C6 females, including those in the Bering Sea, indicated significantly larger specimens from the Japan Sea and Okhotsk Sea, and smaller specimens in the eastern subarctic Pacific, as compared with those in the western subarctic Pacific (including site H) and Bering Sea. A possible overwintering mechanism of E. bungii is discussed.

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Acknowledgements

We are grateful to C.B. Miller for reviewing earlier drafts of this paper; his constructive comments significantly improved the manuscript. This study was supported in part by grant JSPS KAKENHI 14209001 to T.I. The authors hereby declare that experiments performed during this study comply with current laws of Japan.

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Correspondence to Tsutomu Ikeda.

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Communicated by O. Kinne, Oldendorf/Luhe

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Shoden, S., Ikeda, T. & Yamaguchi, A. Vertical distribution, population structure and lifecycle of Eucalanus bungii (Copepoda: Calanoida) in the Oyashio region, with notes on its regional variations. Marine Biology 146, 497–511 (2005). https://doi.org/10.1007/s00227-004-1450-3

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