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首页> 外文期刊>Ocean & coastal management >Spread of non-indigenous macroalgae and disturbance: Impact assessment of the Costa Concordia shipwreck (Giglio Island, Italy) using the ALEX index
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Spread of non-indigenous macroalgae and disturbance: Impact assessment of the Costa Concordia shipwreck (Giglio Island, Italy) using the ALEX index

机译：非本地大型藻类的扩散和干扰：利用ALEX指数对科斯塔·康科迪亚号沉船（意大利吉廖岛）的影响进行评估

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摘要

The establishment and spread of Non-Indigenous Species (NIS) can be facilitated through perturbations that lower the resilience of native communities to invasion. After a disturbance to a rocky subtidal macroalgal assemblage in the Mediterranean Sea (Italy) by a shipwreck (Costa Concordia), we compared native and non-native seaweed community structure at the disturbed site and two reference sites using traditional abundance measures, in addition to employment of the ALien Biotic IndEX (ALEX). ALEX has been recently proposed as a potential multi-metric indicator to evaluate biological invasions in Mediterranean macroalgal assemblages, taking into account both the relative abundance of macroalgal NIS to native seaweed abundances and the invasive traits of those NIS. We found that macroalgal NIS were initially more abundant at the disturbed site, but four months later were decreased and there were no difference with the reference sites. Native macroalgal cover at the disturbed site was lower than at reference sites in the initial survey, but unexpectedly decreased significantly four months later. Despite the decline in the cover of macroalgal NIS, ALEX was consistently lower through time at the disturbed site, due to concurrent declines in native seaweed abundances. This suggests that evaluation of macroalgal NIS should not be based on cover of macroalgal NIS alone and that the relative cover of native species should also be considered. ALEX may represent a versatile tool to be employed in both monitoring programs and impact evaluation studies.
机译：非本地物种（NIS）的建立和传播可以通过降低本地社区抵御入侵能力的摄动来促进。在海难（Costa Concordia）破坏了地中海（意大利）的潮汐带状海藻群落之后，我们使用传统的丰度措施，比较了受干扰地点和两个参考地点的本地和非本地海藻群落结构雇用ALien Biotic IndEX（ALEX）。最近已提出ALEX作为评估地中海大型藻类组合生物入侵的潜在多指标指标，同时考虑到大型藻类NIS与天然海藻丰度的相对丰度以及这些NIS的侵袭性。我们发现巨藻NIS最初在受干扰的位置更丰富，但四个月后下降，并且与参考位置没有差异。在最初的调查中，受干扰部位的天然巨藻覆盖率低于参考部位，但四个月后出人意料地显着下降。尽管大型藻类NIS的覆盖率有所下降，但由于本地海藻丰度的同时下降，在受干扰的地点ALEX随时间的推移一直在降低。这表明对大型藻类NIS的评估不应仅基于大型藻类NIS的覆盖率，还应考虑本地物种的相对覆盖率。 ALEX可能代表要在监视程序和影响评估研究中使用的多功能工具。

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