Centro Tecnológico del Mar-Fundación CETMAR, c/Eduardo Cabello s/n, ES-36208 Vigo, Spain.
Mar Environ Res. 2013 Sep;90:18-26. doi: 10.1016/j.marenvres.2013.05.008. Epub 2013 May 22.
Spatial patterns of non-indigenous species show scale-dependent properties. Sargassum muticum is an invasive macroalga widely distributed along the Atlantic Iberian Peninsula. Despite being quite abundant from Norway to South Portugal, there is little information about its patterns of distribution, particularly at a large spatial scale (i.e. thousands of kilometres). Here, we examined the spatial variation in the invasion success of S. muticum from rockpools at multiple spatial scales using a hierarchical design. In addition, we analysed how the richness of native assemblages was related to its invasion success and how this relationship changed over different scales. Most of the variation in the invasion success was found at the smallest scales of pool and plot. Furthermore, the invasibility of native macroalgal assemblages was related to the native species richness, but causes that determined invasion success could not be separated from the effects provoked by the invader. Results suggest that small-scale (centimetres to metres) processes contribute considerably to the heterogeneity of S. muticum invasion success.
非本地物种的空间分布模式表现出尺度依赖性。巨藻是一种广泛分布于伊比利亚半岛大西洋沿岸的入侵性大型藻类。尽管它在挪威到葡萄牙南部的数量相当多，但关于它的分布模式，特别是在大尺度上（即数千公里）的信息却很少。在这里，我们使用层次设计研究了巨藻在多个空间尺度上从岩池中的入侵成功的空间变化。此外，我们分析了本地生物群落的丰富度与它的入侵成功有何关系，以及这种关系如何随不同尺度而变化。在池和图的最小尺度上发现了大部分入侵成功的变化。此外，本地大型藻类群落的可入侵性与本地物种丰富度有关，但决定入侵成功的原因不能与入侵种引起的影响分开。结果表明，小尺度（厘米到米）的过程对巨藻入侵成功的异质性有很大的贡献。
