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首页> 外文期刊>Frontiers in Marine Science >Recolonization Dynamics of Warm Affinity Halophila nipponica in a Temperate Seagrass Meadow With Zostera marina
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Recolonization Dynamics of Warm Affinity Halophila nipponica in a Temperate Seagrass Meadow With Zostera marina

机译：Zostera Marina温带海草草甸温热亲和力嗜睡草甸的重新播放动态

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Because Halophila nipponica has only recently been reported in the temperate coastal waters of the northwestern Pacific, the recolonization dynamics of this species have not yet been investigated in temperate seagrass meadows. H. nipponica typically occurs in monoculture or in mixed meadows with Zostera marina, the most abundant seagrass species in this region. In this study, small gaps (0.5 × 0.5 m) were created in a mixed seagrass meadow of H. nipponica and Z. marina at Namhae Island on the southern coast of Korea to compare recolonization dynamics of the two species. Eight gaps were created by carefully removing all seagrass tissues to minimize sediment loss in September 2010. Four gaps were marked using only a steel stake at each corner (un-bordered gaps), while the margins of the other four gaps were blocked to a sediment depth of approximately 20 cm using stainless steel blades to prevent penetration of seagrass rhizomes (bordered gaps) to examine the relative contribution of sexual and asexual reproduction to recolonization. Shoot densities of Z. marina and H. nipponica were measured in the gaps and in natural reference plots to estimate recolonization rates. In the bordered gaps, a few Z. marina seedlings and H. nipponica fragments were observed during winter, but no shoots of either species survived to the end of experiment. In the un-bordered gaps, the density of H. nipponica increased rapidly, with approximately 60% recovery after 2 months and reaching 85% after 10 months through only asexual reproduction via clonal growth. By contrast, recolonization of Z. marina was much slower than that of H. nipponica, with only approximately 25% recovery after 10 months through vegetative growth and recruitment of a few seedlings. Asexual reproduction was the principle reproductive mechanism for the recolonization of both Z. marina and H. nipponica at the study site. According to our results, gaps created naturally in mixed seagrass meadows by high water temperatures or catastrophic events such as typhoons may be primarily recolonized by H. nipponica rather than Z. marina, leading to a change in the seagrass ecosystem structure in the northwestern Pacific under ongoing climate change.
机译：由于哈洛芬尼洛杉矶刚刚在西北太平洋的温带沿海水域中报道，因此尚未在温带海草草甸中调查本物种的重新调整动态。 H. nipponica通常发生在单殖民中或Zostera Marina的混合草地上，该地区最丰富的海草物种。在这项研究中，在韩国南部海岸的H. nipponica和Z.Marina的H. Nipponica和Z.Marina的混合海滨Marina中创建了小的间隙（0.5×0.5米。通过小心地去除所有海草组织来创造八个差距，以最大限度地减少2010年9月的沉积物损失。只使用每个角落处的钢桩（无界面差距）标记了四个差距，而另外四个间隙的边距被阻挡到沉积物中使用不锈钢刀片约20厘米的深度，以防止海草根茎（边界间隙）渗透，以检查性与性和无性繁殖对重新播放的相对贡献。 Z.Marina和H. nipponica的射击密度在间隙和自然参考图中测量，以估算重组率。在边界间隙中，在冬季观察到几个Z.Marina幼苗和H. nipponica片段，但在实验结束时不会幸存到任何一种种类的芽。在无界差距中，H. nipponica的密度迅速增加，2个月后恢复约60％，通过克隆生长只有无性繁殖，10个月后达到85％。相比之下，Z.Marina的重新调整比H. Nipponica的重新调整得多，通过植物生长和少数幼苗招募，只有约25％的恢复。无性繁殖是在研究现场进行Z.Marina和H. Nipponica的重新调整的原理繁殖机制。根据我们的结果，通过高水温或灾难性事件（如台风）的混合海草草甸自然创建的差距主要通过H. nipponica而不是Z. Marina来重新调整，导致西北太平洋的海草生态系统结构发生变化正在进行的气候变化。

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