Reproductive Strategies of Annual and Perennial <I>Zostera marina</I> in Mie, Central Japan

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  • 三重県における一年生および多年生アマモの繁殖戦略
  • Reproductive strategies of annual and perennial Zostera marina in Mie Central Japan

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Abstract

Seed production and “rafting” of Zostera marina L. in outdoor mesocosm tanks were examined to better understand the reproductive strategies of annual- and perennial-type Z. marina populations in Ago Bay, Mie. Almost all spadices on reproductive shoots of annual-type population achieved fruit ripening. Prior to seed release from spadices, annual-type reproductive shoots emerged from bottom sediments due to rafting. In contrast, reproductive shoots of perennial-type population released seeds from spadices, after which were broken off from the leaf sheath. The maturity index of the upper branches in annual-type population was higher than that of the lower branches. In perennial-type population, the maturity index of the upper branches was lower than that of the lower branches. Spadices formation in the upper branches of perennial-type population occurred continuously in the flowering season; however, the maturity index of the upper branches rapidly increased in the second half of the flowering season. Out of the 7286 seeds/m2 produced by annual-type populations, 88% disappeared from the stand and 12% became buried locally. In contrast, out of the 4100 seeds/m2 produced annually by perennial-type populations, 100% were buried locally.

Journal

  • Aquaculture Science

    Aquaculture Science 57 (4), 531-540, 2009

    Japanese Society for Aquaculture Science

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