Distribution and dynamics of epibiota on hard structures for coastal protection
Distribution and dynamics of epibiota on hard structures for coastal protection
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DOI：
10.1016/s0272-7714(02)00322-0
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发表时间：
2003-04-01
影响因子：
2.8
通讯作者：
Airoldi, L
中科院分区：
文献类型：
--
作者：
Bacchiocchi, F;Airoldi, L
保护海岸免受侵蚀的硬结构是沿海地区最常见的人工建筑。然而，对于海洋生物如何对它们的存在作出反应，人们知之甚少。对意大利艾米利亚罗马涅海岸3个站点不同类型防御结构（护坡和防波堤）周围不同位置潮间带表层生物的组成和分布进行了分析。采样涵盖了一系列尺度：米（重复地块之间的距离）、数百米（重复区域之间的距离）和数十公里（站点之间的距离）。在两个结构的维护工程之后，我们还量化了1年内显眼物种的定植和动态。防御结构上的群落的特点是物种丰富度明显较低，贻贝和绿色短暂藻类具有很强的空间优势，并且殖民化率很高。贻贝、肠Enteromorpha in肠和丝状藻类的丰度在站点附近区域差异显著。在防波堤的陆地一侧，贻贝的丰度明显低于其他位置。然而，总的来说，在沟滩和防波堤周围不同位置观察到的物种分布差异比预期的要小，这可能是殖民化组合复杂性较低的结果。讨论了解释所观察到的分布模式的可能因素，包括贻贝的收获和对结构的频繁维护工作的作用。讨论了在防御结构和其他人工建筑管理方面所观察到的低物种丰富度的含义。(C) 2003 Elsevier Science B.V.版权所有
Hard structures for protection against erosion of shores are some of the most common human-made constructions in coastal areas. Nevertheless, little is known as to how marine organisms respond to their presence. The composition and distribution of intertidal epibiota at different positions around different types of defence structures (groynes and breakwaters) at three stations along the Emilia Romagna coast (Italy) were analysed. Sampling covered a range of scales: meters (distance among replicate plots), hundreds of meters (distance among replicate areas) and tens of kilometres (distance among stations). The colonisation and dynamics of conspicuous species over I year, following maintenance works on two structures, were also quantified. Assemblages on defence structures were characterised by a notably low richness of species, by strong spatial dominance of mussels and green ephemeral algae, and by high rates of colonisation. Abundance of mussels, Enteromorpha intestinalis and filamentous algae differed significantly among nearby areas within stations. Mussels were significantly less abundant along the landward side of breakwaters compared with all other positions on both groynes and breakwaters. Overall, however, fewer differences, than expected, were observed in the distribution of species at different positions around groynes and breakwaters, probably as a consequence of the low complexity of the colonising assemblages. Possible factors explaining the patterns of distribution observed are discussed, including the roles of harvesting of mussels and frequent maintenance works on the structures. The implications of the low richness of species observed in terms of management of defence structures and other human-made constructions are discussed. (C) 2003 Elsevier Science B.V. All rights reserved.