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首页> 外文期刊>Marine ecology progress series >Facilitation of the introduced green alga Caulerpa racemosa by resident algal turfs: experimental evaluation of underlying mechanisms
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Facilitation of the introduced green alga Caulerpa racemosa by resident algal turfs: experimental evaluation of underlying mechanisms

机译：驻留藻草对引入的绿藻Coulerpa racemosa的促进作用：潜在机制的实验评估

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摘要

There is convincing evidence showing that resistance to invasion greatly varies among recipient assemblages. We assessed whether variation in the performance of the introduced macro-alga Caulerpa racemosa between algal turfs and surfaces dominated by encrusting corallines (barrens) arises from their physical or biological properties, by comparing the invasion success of this alga between natural assemblages and their mimics. Furthermore, to establish whether greater retention of sediments by algal turfs can favour C. racemosa, sediment deposition in barrens was raised to levels matching those recorded in turfs. The effects of herbivores on patterns of distribution of C. racemosa between habitats were evaluated by removing urchins from some experimental patches. The performance of C. racemosa was greater in turfs than in barrens, regardless of the type of substratum (natural or artificial), suggesting that positive effects of turfs on C. racemosa are physical (e.g. entrapment of fragments of the alga and/or enhancing the anchoring of stolons). Removing urchins or enhancing the deposition of sediments in barrens had no effect on C. racemosa. Our results show that the complexity of biogenic substrata is key to determining the spread of this invader and that facilitation of exotic species by natives could enhance ecosystem invasibility. This study has important implications for the management of C. racemosa, as turfs are progressively replacing canopy-forming species along urbanised coasts. Also, it suggests that current invasion theories based on the assumption that interactions between native and exotic species are exclusively negative may be inadequate to predict future invasion scenarios.
机译：有令人信服的证据表明，在接受者群体之间，对入侵的抵抗力差异很大。通过比较自然组合及其模拟物之间这种藻类的入侵成功率，我们评估了引入的大型藻类草皮的性能在藻类草皮和以包埋珊瑚线（贫瘠）为主的表面之间是否因其物理或生物学特性而产生。此外，为了确定藻类草皮更好地保留沉积物是否有利于消旋衣藻，将贫瘠土地上的沉积物沉积提高到与草皮中记录的水平相匹配。通过去除一些实验斑块中的顽童，评估了草食动物对消旋梭菌分布模式的影响。不论基质的类型如何（天然或人工的），草皮中的总沙门氏菌的性能都比贫瘠的大，这表明草皮对总沙门氏菌的积极影响是物理的（例如，藻类碎片的包埋和/或增强）。 sto脚的锚定）。在贫瘠的土地上清除顽童或增加沉积物的沉积对消旋梭状芽孢杆菌没有影响。我们的结果表明，生物基质的复杂性是决定这种入侵者扩散的关键，而当地人对外来物种的促进可以增强生态系统的可入侵性。由于草皮正在逐步取代城市化海岸沿线的树冠形成物种，因此这项研究对C. racemosa的管理具有重要意义。而且，它表明，基于入侵物种与外来物种之间的相互作用完全为负的假设的当前入侵理论可能不足以预测未来的入侵情景。

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