Distributional patterns and their seasonal fluctuation of <i>Zostera japonica</i> in the subtropical intertidal zone around Ishigaki Island, southern Japan

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  • YAMADA HIDEAKI
    Fisheries Technology Institute, Japan Fisheries Research and Education Agency
  • TANITA IWAO
    Yaeyama Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency

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Other Title
  • 石垣島潮間帯域におけるコアマモ<i>Zostera japonica</i>群落の分布特性と季節的消長
  • 石垣島潮間帯域におけるコアマモZostera japonica群落の分布特性と季節的消長
  • イシガキジマ シオマ タイイキ ニ オケル コアマモ Zostera japonica グンラク ノ ブンプ トクセイ ト キセツテキ ショウチョウ

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Abstract

<p>　Zostera japonica is an intertidal seagrass with a wide latitudinal distribution extending from tropical to temperate zones. We examined the distributional characteristics of Z. japonica in a subtropical intertidal zone. In a lagoon-like calm area with low current velocity and short emersion duration, Z. japonica had long vegetative shoots, high above-ground and below-ground biomasses, and sparse shoot density, compared to those in sites around the upper and lower distributional limits. At sites around the upper and lower distributional limits, shoot length of vegetative shoots, as well as above-ground and below-ground biomasses, showed moderate differences between June 2019 and February 2021. In the main distribution area with dense meadows, shoot length and above-ground biomass reached maximum values during June to August, while total shoot density increased during the winter season, suggesting that the above-ground biomass mainly depends on shoot length. The density of reproductive shoots indicated a high value only in February, implying that sexual reproduction occurs during a short duration around the lowest temperature period. Therefore, the progress of global warming may cause a decline of reproductive effort in subtropical populations.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 90 (2), 105-114, 2024-03-15

    The Japanese Society of Fisheries Science

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