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首页> 外文期刊>Marine ecology progress series >Seagrass response to burial and breakage of expanding horizontal rhizomes: implications for clone spread
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Seagrass response to burial and breakage of expanding horizontal rhizomes: implications for clone spread

机译：海草对埋葬和扩大的水平根茎断裂的反应：对克隆传播的影响

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In seagrasses, elongation of horizontal rhizomes, and hence clone expansion, is supported by physiological integration. However, horizontal rhizomes are subjected to breakage by physical disturbances and to burial, often simultaneously. Little is known about the combined impact of such factors on the growth of apical rhizome regions. We factorially manipulated connections on runners of Cymodocea nodosa and sediment height for 1 mo at 2 sites within a meadow to test the hypothesis that breakage of interconnections close (10 cm) to the rhizome apex causing premature loss of physiological integration would negatively affect the performance of runners and reduce their ability to tolerate burial (60% of shoot height). Shoot survival, length of vertical internodes and horizontal rhizome network, biomass production, partitioning, and costs were unaffected by the investigated factors. Rhizome breakage interacted with burial for some characteristics. Breakage reduced branch length and rhizome diameter only in unburied runners, while burial reduced branch length only in intact runners. Moreover, burial stimulated leaf sheath elongation and greater branching, irrespective of the status of connections. These findings indicate that breakage only delays lateral spread and increases the risk of fragmentation by subsequent disturbances, and, contrary to our hypothesis, has no substantial influence on the capacity of runners to withstand transitory and moderate burial. The findings also reveal that runners may escape from burial not only vertically, but also horizontally, changing growth pattern and direction from predominantly unidirectional to multidirectional. This additional strategy could allow buried runners to accelerate space occupation even if disconnected from clones.
机译：在海草中，生理学上的整合支持水平根状茎的伸长，进而克隆扩展。但是，水平的根茎经常受到物理干扰的破坏和埋葬。关于这些因素对根状茎根部区域生长的综合影响知之甚少。我们在草地上的2个位置对结节藻（Cymodocea nodosa）跑步者的连接和沉积物高度进行了1个月的析因操纵，以测试以下假设：互连的断开靠近根茎尖（10 cm）会导致生理整合的过早丧失，这会对根茎的性能产生负面影响。跑步者，并降低其承受埋葬的能力（枝高的60％）。枝条存活率，垂直节间和水平根茎网络的长度，生物量的产生，分配和成本均不受调查因素的影响。根茎断裂与埋葬相互作用，具有某些特征。破损仅在未埋葬的马匹中减少分支长度和根茎直径，而埋葬仅在完整的马匹中减少分支长度。而且，埋葬刺激了叶鞘的伸长和更大的分支，而不论连接状态如何。这些发现表明，破损只会延迟侧向张开，并增加后续扰动造成破碎的风险，并且与我们的假设相反，对跑步者承受短暂和中等埋葬的能力没有实质性影响。研究结果还表明，跑步者不仅可以在垂直方向上也可以在水平方向上逃脱，从而将生长方式和方向从主要的单向改变为多向。即使与克隆体断开连接，这种附加策略也可以使埋葬的赛跑者加快对空间的占领。

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