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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Impact of sediment grain-size and biofilm age on epipelic microphytobenthos resuspension
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Impact of sediment grain-size and biofilm age on epipelic microphytobenthos resuspension

机译：沉积物粒度和生物膜年龄对上肢微底栖动物重悬的影响

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Intertidal zones are dynamic areas, where tidal currents and wind-induced waves are responsible of resuspension of the sediment and associated microphytobenthos (MPB). Sediment composition (mud-sand mixtures) and MPB biofilm age are two major components involved in resuspension of epipelic microphytobenthos in muddy areas. However, their relative role in resuspension phenomenon must be better understood in controlled conditions. In this study, three mud-sand mixtures (Pure mud M1, 75% mud/25% sand M2 and 50% mud/50% sand M3) were tested with an epipelic MPB biofilm of different ages (3, 6 and 9 days after inoculum) using an erodimeter flume. The biofilm biomass, physiological state, photosynthetic parameters and Extracellular Polymeric Substances (EPS) were surveyed as well as water content and ammonium concentration in the sediment. Chl a content and Suspended Particular Inorganic Matter (SPiM) erodability differed between treatments, biofilm being able to be eroded before sediment when it is well constituted (especially in pure mud M1). Between day 3 and day 9 of culture, biofilm age did significantly affect critical thresholds for Chl a erosion and sediment resuspension for mud-sand mixtures (M2 and M3). Sediment resuspension seemed to be also driven by physical constraints like differential compaction and vertical sand segregation as a function of mud content. Indeed, grain-size was the main factor involved in MPB resuspension phenomenon, with an optimum reached near a equilibrate ratio between mud and sand (50% mud-50% sand). Proteins of the EPS bound fraction (extracted with dowex resin) appeared to have a critical role in the pioneering stages of biofilm installation, allowing its formation in a less favorable environment caused by sand enrichment (mixtures M2 and M3). This effect of bound EPS must be mediated by an increasing cohesion and lowering sediment permeability. Carbohydrate content of the bound EPS fraction was directly related to the sediment (SPiM) erodability, independently from mixture type or biofilm age. (C) 2015 Elsevier B.V. All rights reserved.
机译：潮间带是动态区域，潮汐流和风感应波负责沉积物和相关的微底栖动物（MPB）的重新悬浮。泥沙成分（泥沙混合物）和MPB生物膜年龄是在泥质地区重悬表观微底栖动物的两个主要组成部分。但是，必须在受控条件下更好地了解它们在重悬现象中的相对作用。在这项研究中，对三种泥沙混合物（纯泥M1、75％泥/ 25％沙M2和50％泥/ 50％沙M3）进行了测试，并使用了不同年龄（分别在第3天，第6天和第9天后）的MPB生物膜接种）。调查了生物膜的生物量，生理状态，光合作用参数和细胞外聚合物（EPS）以及沉积物中的水含量和铵浓度。不同处理之间的氯化物含量和悬浮的特殊无机物（SPiM）侵蚀性不同，当生物膜结构良好时（尤其是在纯泥M1中），生物膜能够在沉积物之前被侵蚀。在培养的第3天至第9天之间，生物膜的年龄确实显着影响了Ch1 a侵蚀和泥沙混合物（M2和M3）的沉积物再悬浮的临界阈值。泥沙的重新悬浮似乎也受到物理约束的驱动，例如压实压实和垂直砂粒偏析与泥浆含量的关系。的确，粒度是影响MPB重悬浮现象的主要因素，在泥沙之间（50％泥土-50％沙土）之间达到了接近平衡的最佳比例。 EPS结合级分的蛋白质（用dowex树脂提取）在生物膜安装的开创阶段似乎起着关键作用，从而使其在由沙子富集（混合物M2和M3）引起的不利环境中形成。结合的EPS的这种作用必须通过增加内聚力和降低​​沉积物的渗透性来介导。结合的EPS组分中的碳水化合物含量与沉积物（SPiM）的可蚀性直接相关，而与混合物类型或生物膜的年龄无关。 （C）2015 Elsevier B.V.保留所有权利。

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