Effects of low dissolved oxygen on planula settlement, polyp growth and asexual reproduction of Aurelia aurita

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Tokyo Bay is one of the most eutrophicated bays in Japan, and mass occurrences of scyphozoan jellyfish <i>Aurelia aurita</i> have often been observed with progress of eutrophication. In the coastal environment, the abundance of substrates suitable for <i>A. aurita</i> polyps are obviously increasing by reclamation. However, most suitable substrates for settling, except in the bottom-layer in the innermost part of Tokyo Bay, are occupied by other sessile organisms such as mussels, barnacles or ascidians. The bottom layer is characterized by low DO concentrations (≦2.0 ml O<sub>2</sub> L<sup>−1</sup>) that turn to hypoxia during summer, resulting in low recruitment and low growth of other sessile organisms. To elucidate the mechanism by which mass occurrence of jellyfish occurs, adaptative behavior to hypoxia in planula larvae and the polyp stage was experimentally studied. In the present study, planula settlement was promoted by a decrease in DO concentrations, and apparent growth of polyps and production of daughter polyps by asexual budding were also observed, even in the polyps cultured in hypoxic waters. Moreover <i>A. aurita</i> polyps cultured under hypoxic conditions began strobilation and ephyrae were liberated after the DO concentration levels were restored. It is suggested that the occurrence of hypoxic waters is rather favorable for the survival, growth and asexual reproduction of <i>A. aurita</i> polyps, and it can directly contribute to the consequent production of <i>A. aurita</i> ephyrae in the next spring within Tokyo Bay.

収録刊行物

  • Plankton & benthos research  

    Plankton & benthos research 3, 107-113, 2008-05-01 

    The Plankton Society of Japan, The Japanese Association of Benthology

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各種コード

  • NII論文ID(NAID)
    10021072875
  • NII書誌ID(NCID)
    AA12130745
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    18808247
  • NDL 記事登録ID
    9533626
  • NDL 雑誌分類
    ZR1(科学技術--生物学)
  • NDL 請求記号
    Z54-J424
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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