Distribution and Abundance of resting cysts of Alexandrium tamarense and/or A. catenella (Dinophyceae) in Tokyo Bay, Japan

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Sediment samples collected at 33 stations in Tokyo Bay during the autumn of 1999 were examined to determine the distribution and abundance of resting cysts of Alexandrium tamarense and/or A. catenella. Extremely low concentrations of cysts were observed in Tokyo Bay compared with previously investigated sites in the Seto Inland Sea and Lake Hamana which have almost the same marine environmental conditions as found in Tokyo Bay. Cysts were only found in the upper 2.0-3.0 cm of sediment at three stations along the northwestern coast of the bay, at concentrations ranging from 0.8-2.1 cysts cm-3 of wet sediment. All of the observed cysts consisted of the outer thecal integument with no vegetative contents and are therefore concluded to be unable to play a role in the seeding of blooms. Thus, currently the possibility of paralytic shellfish poisoning, caused by a bloom of A. tamarense and/or A. catenella initiated from benthic cysts, is considered to be low in Tokyo Bay. However, commercial shellfish fisheries and recreational shellfish gathering are expected to remain important activities in this bay. Careful monitoring of toxic dinoflagellates and shellfish toxicity is necessary, because invasion by toxic dinoflagellates into Tokyo Bay via ballast water or oceanic water are potential events in the future.

Sediment samples collected at 33 stations in Tokyo Bay during the autumn of 1999 were examined to determine the distribution and abundance of resting cysts of Alexandrium tamarense and/or A. catenella. Extremely low concentrations of cysts were observed in Tokyo Bay compared with previously investigated sites in the Seto Inland Sea and Lake Hamana which have almost the same marine environmental conditions as found in Tokyo Bay. Cysts were only found in the upper 2.0–3.0 cm of sediment at three stations along the northwestern coast of the bay, at concentrations ranging from 0.8–2.1 cysts cm−3 of wet sediment. All of the observed cysts consisted of the outer thecal integument with no vegetative contents and are therefore concluded to be unable to play a role in the seeding of blooms. Thus, currently the possibility of paralytic shellfish poisoning, caused by a bloom of A. tamarense and/or A. catenella initiated from benthic cysts, is considered to be low in Tokyo Bay. However, commercial shellfish fisheries and recreational shellfish gathering are expected to remain important activities in this bay. Careful monitoring of toxic dinoflagellates and shellfish toxicity is necessary, because invasion by toxic dinoflagellates into Tokyo Bay via ballast water or oceanic water are potential events in the future.

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  • Plankton & benthos research  

    Plankton & benthos research 1(3), 147-154, 2006-08-01 

    日本プランクトン学会、日本ベントス学会

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各種コード

  • NII論文ID(NAID)
    10018242589
  • 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
    8055606
  • 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  NDL  IR  J-STAGE 
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