Are some communities of the coastal dune zonation more susceptible to alien plant invasion?
Are some communities of the coastal dune zonation more susceptible to alien plant invasion?
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DOI：
10.1093/jpe/rtp037
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发表时间：
2010-06-01
影响因子：
2.7
通讯作者：
Acosta, A. T. R.
中科院分区：
文献类型：
--
作者：
Carboni, M.;Santoro, R.;Acosta, A. T. R.
目标沿海地区，特别是沿海沙丘，是受外来植物入侵严重影响的生态系统。然而，很少有人尝试量化沿海地带不同社区的外来物种发生率。这项工作旨在分析第勒尼安海岸沙质海岸带上外来植物的分布，特别是解决外来植物丰度方面植物群落之间的差异。方法本研究对意大利中西部海岸的近期沙丘（全新世）进行了研究。我们选择了入侵过程特别明显的沙丘景观。对植被样地进行随机抽样，并通过聚类分析，我们确定了与意大利中部第勒尼安沙质海岸描述的典型分区相对应的六个植物群落。我们评估并比较了这些不同社区的入侵频率和丰度。此外，我们还研究了繁殖压力（使用替代人体结构进行测量）如何影响观察到的入侵模式。重要发现我们发现外星生物总数相对较低，但在植被带的特定区域中，一些外星生物的分布模式存在差异，且丰度很高。过渡沙丘的常年群落似乎受入侵过程的影响最大，几乎完全与频繁且广泛分布的 Carpobrotus aff 有关。腺泡状。这种外来物种达到了很高的覆盖度值，显然降低了过渡沙丘植物群落本地物种的覆盖度。过渡沙丘中较高水平的入侵可以部分解释为沙丘剖面此部分的繁殖体压力较大。因此，我们的研究结果具有重要的保护和管理意义，因为沿整个意大利海岸，带有 Crucianella maritima 的过渡沙丘群落非常罕见并受到保护（sensu Habitat 92/43/EEC 指令）。
AimsCoastal areas, and in particular coastal dunes, are ecosystems strongly affected by the invasion of alien plants. However, few attempts have ever been made to quantify alien species incidence in different communities along the coastal zonation. This work aims to analyze the distribution of alien plants along the coastal zonation of sandy shores on the Tyrrhenian coast, addressing specifically differences among plant communities in abundance of alien plants.MethodsThe study was performed on recent dunes (Holocene) of the central western coast of Italy. We selected dune landscapes where invasion processes were particularly evident. Vegetation plots were randomly sampled and through cluster analysis, we identified six plant communities corresponding to the typical zonation described for the Tyrrhenian sandy coast of Central Italy. We evaluated and compared frequency and abundance of invasion in these different communities. Further, we investigated how propagule pressure (measured using as proxy human structures) contributed to the observed invasion patterns.Important FindingsWe found a relatively low total number of aliens but also a differential distribution pattern and strong abundance of some of the aliens in specific sectors of the vegetation zonation. The perennial community of transition dunes appears most affected by invasion processes, related almost exclusively to the frequent and widespread Carpobrotus aff. acinaciformis. This alien species reaches high cover values, apparently lowering cover of native species of transition dune plant communities. Higher levels of invasion in the transition dune can be partially explained because of greater propagule pressure in this section of the dune profile. Our findings thus have important conservation and management implications since transition dune communities with Crucianella maritima are rare and protected (sensu Habitat 92/43/EEC Directive) along the entire Italian coast.