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Marine Biology

, Volume 144, Issue 4, pp 713–721 | Cite as

Seasonal changes in abundance and development of Calanus pacificus (Crustacea: Copepoda) in the Oyashio–Kuroshio Mixed Region

  • T. KobariEmail author
  • T. Nagaki
  • K. Takahashi
Research Article

Abstract

Seasonal changes in abundance and development of Calanus pacificus Brodsky were investigated by analyzing samples of different depth strata (0–150 m and 0–1000 m) collected monthly in the Oyashio–Kuroshio Mixed Region. Copepodite stage 5 (C5) emerged from dormancy and matured in early summer. A new generation appeared in July and developed into C5 during summer to autumn. Some of the summer generation arrested development at C5 and persisted below 150 m depth until the following early summer. Although the remainder matured and reproduced in October, a new generation was not observed at the surface during winter. These results suggest that C. pacificus shows two different life-cycle patterns, i.e. one generation annually, with overwintering C5 in deep waters, and two generations annually, with surface development during autumn to winter. The complex life-cycle patterns may be an adaptation to the highly fluctuating surface environment in the Oyashio–Kuroshio Mixed Region.

Keywords

Zooplankton Biomass Zooplankton Sample Copepodite Stage Oyashio Water Spring Phytoplankton Bloom 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We are grateful to M.D. Ohman for valuable comments and to G.N. Nishihara for corrections of our English. We thank the captain and crews of R.V. “Takuyo Maru” for help with zooplankton sampling. Thanks are extended to three anonymous referees for valuable comments that improved the manuscript. A part of the present study was supported by grants from the Japan Science Technology Corporation; from the program studies on long-term variation of ocean ecosystem/climate interactions based on the Odate collection of the Ministry of Environment of Japan; and from the deep-sea ecosystem and exploitation program of the Fisheries Agency of Japan.

References

  1. Astthorsson OS, Gislasson A (2003) Seasonal variations in abundance, development and vertical distribution of Calanus finmarchicus, C. hyperboreus and C. glacialis in the East Icelandic Current. J Plankton Res 25:843–854CrossRefGoogle Scholar
  2. Atkinson A (1998) Life cycle strategies of epipelagic copepods in the Southern Ocean. J Mar Syst 15:289–311CrossRefGoogle Scholar
  3. Banse K, English DC (1999) Comparing phytoplankton seasonality in the eastern and western subarctic Pacific and the western Bering Sea. Prog Oceanogr 43:235–288CrossRefGoogle Scholar
  4. Beamish RJ, Leask KD, Ivanov OA, Balanov AA, Orlov AM, Sinclair B (1999) The ecology, distribution, and abundance of midwater fishes of the subarctic Pacific gyres. Prog Oceanogr 43:399–442CrossRefGoogle Scholar
  5. Brodeur R, McKinnell S, Nagasawa K, Pearcy W, Radchenko V, Takagi S (1999) Epipelagic nekton of the North Pacific Subarctic and Transition Zones. Prog Oceanogr 43:365–397CrossRefGoogle Scholar
  6. Conover RJ (1988) Comparative life histories in the genera Calanus and Neocalanus in high latitudes of the northern hemisphere. Hydrobiolgia 167/168:127–142Google Scholar
  7. Fedotova NA (1975) About seasonal character composition and zooplankton distribution in the southwestern Sakhalin Island. Izvestia TINRO 96:57–79Google Scholar
  8. Geynrikh AK (1968) Seasonal phenomena in the plankton of the northeast Pacific Ocean. Oceanology 8:231–239Google Scholar
  9. Hirakawa K (1979) Seasonal changes of population structure of a calanoid copepod, Calanus pacificus, in Funka Bay, Hokkaido. Bull Plankton Soc Jpn 26:49–58Google Scholar
  10. Hirche H-J (1997) Life cycle of the copepod Calanus hyperboreus in the Greenland Sea. Mar Biol 128:607–618CrossRefGoogle Scholar
  11. Holm-Hansen O, Lorenzen CJ, Holmes RW, Strickland JD (1965) Fluorometric determination of chlorophyll. J Cons Int Explor Mer 30:3–15Google Scholar
  12. Kawai H (1972) Hydrography of Kuroshio and Oyashio. In: Masuzawa J (ed) Physical oceanography. II. Tokai University Press, Tokyo, pp 129–320Google Scholar
  13. Kawamura A (1989) Fast sinking mouth ring for closing NORPAC net. Bull Jpn Soc Sci Fish 55:1121Google Scholar
  14. Kobari T, Ikeda T (1999) Vertical distribution, population structure and life cycle of Neocalanus cristatus (Crustacea: Copepoda) in the Oyashio region, with notes on its regional variations. Mar Biol 134:683–696CrossRefGoogle Scholar
  15. Kobari T, Ikeda T (2000) Life cycle of Neocalanus species in the Oyashio region. Bull Plankton Soc Jpn 47:129–135Google Scholar
  16. Kobari T, Ikeda T (2001a) Life cycle of Neocalanus flemingeri (Crustacea: Copepoda) in the Oyashio region, western subarctic Pacific, with notes on its regional variations. Mar Ecol Prog Ser 209:243–255Google Scholar
  17. Kobari T, Ikeda T (2001b) Ontogenetic vertical migration and life cycle of Neocalanus plumchrus (Crustacea: Copepoda) in the Oyashio region, with notes on regional variations in body size. J Plankton Res 23:287–302CrossRefGoogle Scholar
  18. Kobari T, Shinada A, Tsuda A (2003) Functional roles of interzonal migrating mesozooplankton in the western subarctic Pacific. Prog Oceanogr 57:279–298CrossRefGoogle Scholar
  19. Mackas DL, Tsuda A (1999) Mesozooplankton in the eastern and western subarctic Pacific: community structure, seasonal life histories, and interannual variability. Prog Oceanogr 43:335–363CrossRefGoogle Scholar
  20. Mauchline J (1998) The biology of calanoid copepods. Adv Mar Biol 33:1–710Google Scholar
  21. McLaren IA (1978) Generation length of some temperate marine copepods: estimation, prediction and implications. J Fish Res Board Can 35:1330–1342Google Scholar
  22. McLaren IA, Tremblay MJ, Corkett CJ, Roff JC (1989) Copepod production on the Scotian Shelf based on life-history analysis and laboratory rearings. Can J Fish Aquat Sci 46:560–583Google Scholar
  23. Motoda S (1957) North Pacific standard net. Inf Bull Planktol Jpn 4:13–15Google Scholar
  24. Odate K (1994) Zooplankton biomass and its long-term variation in the western North Pacific Ocean, Tohoku Sea area, Japan. Bull Tohoku Natl Fish Res Inst 56:115–173Google Scholar
  25. Ohman MD, Drits AV, Clarke Ml, Plourde S (1998) Differential dormancy of co-occurring copepods. Deep-Sea Res 45:1709–1740Google Scholar
  26. Omori M (1969) Weight and chemical composition of some important oceanic zooplankton in the North Pacific Ocean. Mar Biol 3:4–10Google Scholar
  27. Osgood KE, Frost BW (1994) Comparative life histories of three species of planktonic calanoid copepods in Dabob Bay, Washington. Mar Biol 118:627–636Google Scholar
  28. Parsons TR, Lalli CR (1988) Comparative oceanic ecology of plankton communities of the subarctic Atlantic and Pacific Oceans. Oceanogr Mar Biol Annu Rev 26:317–359Google Scholar
  29. Planque B, Hays GC, Ibanez F, Gamble JC (1997) Large-scale spatial variations in the seasonal abundance of Calanus finmarchicus. Deep-Sea Res 44:315–326Google Scholar
  30. Sato N, Furuhashi K, Ebara S (1981) Extraction method of phytoplankton pigments without grinding for fluorometric measurement employed by Japan Meteorological Agency. Bull Plankton Soc Jpn 28:173–178Google Scholar
  31. Schnack-Schiel SB, Hagen W (1994) Life cycle strategies and seasonal variations in distribution and population structure of four dominant calanoid copepod species in the eastern Weddell Sea, Antarctica. J Plankton Res 16:1543–1566Google Scholar
  32. Shimizu Y, Yasuda I, Ito S (2001) Distribution and circulation of the coastal Oyashio intrusion. J Phys Oceanogr 31:1561–1578CrossRefGoogle Scholar
  33. Smith SL, Jones BH, Atkinson LP, Brink KH (1986) Zooplankton in the upwelling fronts off Pt. Conception, California. In: Nihoul JCJ (ed) Marine interfaces ecohydrodynamics. Elsevier, Amsterdam, pp 195–213Google Scholar
  34. Sugimoto T, Tadokoro K (1997) Interannual–interdecadal variations in zooplankton biomass, chlorophyll concentration and physical environment in the subarctic Pacific and Bering Sea. Fish Oceanogr 6:74–93CrossRefGoogle Scholar
  35. Tande KS, Hassel A, Slagstad D (1985) Gonad maturation and possible life cycle strategies in Calanus finmarchicus and Calanus glacialis in the northwestern part of the Barents Sea. In: Gray JS, Christiansen ME (eds) Marine biology of polar regions and effects of stress on marine. Wiley, New York, pp 141–155Google Scholar
  36. Terazaki M, Tomatsu C (1997) A vertical multiple opening and closing plankton sampler. J Adv Mar Sci Tech Soc 3:127–132Google Scholar
  37. Tsuda A, Saito H, Kasai H (1999) Life histories of Neocalanus flemingeri and Neocalanus plumchrus (Calanoida: Copepoda) in the western subarctic Pacific. Mar Biol 135:533–544CrossRefGoogle Scholar
  38. Vidal J (1980) Physioecology of zooplankton. I. Effects of phytoplankton concentration, temperature, and body size on the development and molting rates of Calanus pacificus and Pseudocalanus sp. Mar Biol 56:111–134Google Scholar
  39. Williams R, Conway DVP (1988) Vertical distribution and seasonal numerical abundance of the Calanidae in oceanic waters to the south-west of the British Isles. Hydrobiologia 167/168:259–266Google Scholar
  40. Yokouchi K, Tomosada A, Matsuo Y, Inagake D (1996) Seasonal change in chlorophyll a profiles in the Tohoku Sea area. Bull Tohoku Natl Fish Res Inst 58:11–26Google Scholar

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Aquatic Resource Science Laboratory, Faculty of FisheriesKagoshima UniversityKagoshimaJapan
  2. 2.Miyagi Prefecture Fisheries Research and Development CenterIshinomakiJapan
  3. 3.Biological Oceanography Section, Mixed Water Region Fisheries Oceanography DivisionTohoku National Fisheries Research InstituteShiogamaJapan

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