Abstract

Colonisation of artificial structures by primary producers is an important determinant for eco-engineering projects. In this context, interactions between the colonisation by microphytobenthic biofilm and macroalgae were explored on 48 samples of marine infrastructures (MI) immersed for one year in the English Channel. Marine infrastructures samples with smooth and rough surface were compared to evaluate the influence of surface micro-scale rugosity. Microphytobenthos biomass (MPB), macroalgal diversity and photosynthetic parameters of both were assessed during colonisation. No significant differences were found as a function of the surface rugosity of MI samples, which was unexpected, but can be explained by biogenic rugosity provided by barnacles. Marine infrastructures were largely colonised by a red encrusting alga, Phymatolithon purpureum, which showed poor photosynthetic capacity compared to the microphytobenthos present next to it. Colonisation by monospecific encrusting algae tended to reduce the primary productivity of hard substrate.

摘要

初级生产者对人工结构的殖民化是生态工程项目的重要决定因素。在此背景下，在英吉利海峡浸泡一年的 48 个海洋基础设施 (MI) 样本上探索了微型底栖生物膜和大型藻类的定殖之间的相互作用。比较了具有光滑和粗糙表面的海洋基础设施样品，以评估表面微尺度粗糙度的影响。在定殖期间评估了两者的微型底栖植物生物量 (MPB)、大型藻类多样性和光合参数。作为 MI 样品表面粗糙度的函数，没有发现显着差异，这是出乎意料的，但可以用藤壶提供的生物粗糙度来解释。海洋基础设施在很大程度上被一种红色的藻类所占据，Phymatolithon purpureum，与旁边的微型底栖植物相比，其光合能力较差。单特异性结壳藻类的定殖往往会降低硬质基质的初级生产力。