Marine Biology

, Volume 150, Issue 5, pp 905–917 | Cite as

Distribution, life history, and production of three species of Neomysis in Akkeshi-ko estuary, northern Japan

  • Katsumasa YamadaEmail author
  • Kazutaka Takahashi
  • Carole Vallet
  • Satoru Taguchi
  • Tatsuki Toda
Research Article


Spatial and seasonal distribution pattern, life history and production of three species of Neomysis (Mysidacea) which commonly occur in northwestern subarctic Pacific coastal waters, were investigated throughout the year in the Akkeshi-ko estuary, northern Japan. The most abundant species Neomysis awatschensis (annual mean density: 179.8 inds. m−2, biomass: 108.8 mg DW m−2) occurred at the inner part of the estuary including low salinity areas with no clear preference for the seagrass bed. The second most abundant Neomysis mirabilis (mean density: 95.8 inds. m−2, biomass: 90.1 mg DW m−2) occurred at relatively saline seagrass site throughout the year. Occurrence of Neomysis czerniawskii in the estuary was limited to the seagrass bed during summer when their population mainly consisted of juveniles, suggesting that this species is a seasonal migrant between the estuary and the marine environment. Both N. awatschensis and N. mirabilis populations were composed of two generation types, a larger sized overwintering and smaller sized spring/summer generations; however, each species had a different reproductive strategy. N. awatschensis was characterized by fast growth to maturity at a smaller size than N. mirabilis with a relatively high fecundity during warm season, suggesting that this species is an r-strategist which can utilize opportunistically a wide variety of habitats. In contrast, the seagrass bed resident N. mirabilis was a K-strategist which matures at a larger size producing fewer but larger offspring. The annual production of N. awatschensis (0.57–0.70 g DW m−2, mean of the whole estuary) and N. mirabilis (0.58–0.68 g DW m−2, mean of the seagrass bed) at their respective habitats was comparable. Consequently, species-specific life history and distribution pattern are concluded to allow Neomysis spp. to coexist in the estuary and the high carrying capacity of seagrass bed is suggested to contribute to maintain their high biomass level.


Brood Size Size Category Summer Generation Brooding Female Estuary Opening 
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We thank to M. Moroi, S. Hamano, H. Mukai, H. Iizumi, K. Suzuki, T. Toyohara, and H. Sasaki for assistance with the field collection. M. Nakaoka, Y. Tanaka, M. Hori, N. Hasegawa, H. Kawamura, and T. Takano helped with the analysis and discussion. A part of this research was financially supported by a Sasakawa Scientific Research Grant from the Japan Science Society for KT and a Grant-in-Aid for Scientific Research of Lake Akkeshi and Bekanbeushi Wetland for KY.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Katsumasa Yamada
    • 1
    Email author
  • Kazutaka Takahashi
    • 2
  • Carole Vallet
    • 3
    • 4
  • Satoru Taguchi
    • 5
  • Tatsuki Toda
    • 5
  1. 1.Graduate school of Science and Technology, Chiba UniversityChibaJapan
  2. 2.Tohoku National Fisheries Research InstituteMiyagiJapan
  3. 3.Centre d’OutreauIUFM Nord-Pas de CalaisOutreauFrance
  4. 4.Laboratoire d’ichtyoécologie marine (LIMUL)Université du Littoral-Côte d′OpaleWimereuxFrance
  5. 5.Department of Environmental Engineering for SymbiosisFaculty of Engineering, Soka UniversityTokyoJapan

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