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Uprooting of <I>Zostera Marina</I> Shoots in Relation to the Belowground Biomass Reduction in Nagatsuraura Bay, Japan

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Other Title
  • 閉鎖性海域である宮城県長面浦湾におけるアマモ草体の流出機構の検討
  • ヘイサセイ カイイキ デ アル ミヤギケン ナガツラウラワン ニ オケル アマモ ソウタイ ノ リュウシュツ キコウ ノ ケントウ

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Abstract

The objective of this study is to investigate the effect of belowground biomass reduction on the stability of eelgrass shoots in sediment in order to clarify the factors responsible for the outflow of eelgrass shoots even with little wave disturbance in Nagatsuraura Bay, Japan. We also investigated environmental conditions in the vicinity of eelgrass with and without root death. Loss of roots without dying-back symptoms led to a decrease in the stability of eelgrass shoots in sediment, and allows for the uprooting of shoots with little disturbance. The decay of healthy root biomass of eelgrass was associated with high sulfide concentration in sediment and/or low photosynthetic activity. In sulfide concentrations between 0.5mg g D.W.-1 and 1.5mg g D.W.-1, eelgrass with high photosynthetic activity tended to display fewer stunted roots compared to shoots for which photosynthetic rates were low. This result suggests that eelgrass with high photosynthetic activity seemed to prevent sulfide intrusion by supplying oxygen to belowground tissues to maintain an oxic microsphere around the roots and re-oxidizing it to a harmless sulfate.

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Details

  • CRID
    1390001205451796736
  • NII Article ID
    10019675781
  • NII Book ID
    AN0018645X
  • DOI
    10.11457/swsj1965.61.321
  • NDL BIB ID
    9299280
  • ISSN
    03694550
  • Text Lang
    ja
  • Data Source
    • JaLC
    • NDL
    • CiNii Articles
    • KAKEN
  • Abstract License Flag
    Disallowed

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