Movement of Microphytobenthos and Sediment Between Mudflats and Salt Marsh During Spring Tides
Movement of Microphytobenthos and Sediment Between Mudflats and Salt Marsh During Spring Tides
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DOI：
10.3389/fmars.2020.00496
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
N. S. Redzuan;G. Underwood
中科院分区：
文献类型：
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作者：
N. S. Redzuan;G. Underwood
通过比较潮滩和盐沼底栖生物叶绿素a（Chl. a）和悬浮的Chl. a在2015年超级月亮事件期间的涨潮和落潮期间。在8月和9月进行了为期4天的采样。涨潮水携带显着较高量的叶绿素。a从泥滩过渡区进入盐沼的数量与退潮时离开盐沼的数量相比。悬浮固体负荷，悬浮叶绿素。a浓度和硅藻种类组成提供的证据表明，含有生物膜材料的再悬浮泥滩沉积物被涨潮转移到盐沼。沉积物叶绿素含量之间呈显著负相关。a在上部泥滩过渡带和叶绿素浓度。涨潮水中的a浓度表明，生物膜减少了沉积物的再悬浮，从而使沉积物具有生物稳定性。平均风速对叶绿素再悬浮有显著的正效应。a从盐沼沉积物表面进入落潮（p < 0.001）。Chl.潮沃茨中a的再悬浮分别与泥滩和盐沼沉积物表面的MPB生物量显著相关。涨潮时泥滩重悬硅藻与潮涨潮时盐沼硅藻的相似性为54.3%。硅藻类群的盐沼组合的特点，和一些沉积硅藻类群被重新悬浮，并进行了落潮期间的盐沼。叶绿素的再悬浮涨潮和落潮沃茨中的A均受潮差的显著控制（均为P < 0.001）。在大潮期间，MPB泥滩特征性硅藻分类群和沉积物从邻近的泥滩净移动到盐沼，有助于夏季植物沼泽内物质的积累。
The movement of sediment and associated microphytobenthos (MPB) between the upper mudflat and salt marsh in a macrotidal estuary was investigated by comparing the variability of benthic chlorophyll a (Chl. a) and suspended Chl. a during flood and ebb spring tides during the 2015 supermoon event. Sampling was carried out for 4 days in August and September. Flood-tide water carried significantly higher amounts of Chl. a from the mudflat transition zone onto the salt marsh compared to the amount of leaving the salt marsh during ebb tides. Suspended solid loads, suspended Chl. a concentrations, and diatom species composition provided evidence that resuspended mudflat sediments containing biofilm material were transferred onto the salt marsh by flood tide. Significant negative correlations between sediment Chl. a concentrations on the upper mudflat transition zone and Chl. a concentrations in flood-tide water indicated biostabilization of sediments by biofilms reducing sediment resuspension. Mean wind speed had a significant positive effect on resuspending Chl. a from the salt marsh sediment surface into the ebb tide (p < 0.001). The amount of Chl. a being resuspended in flood and ebb tidal waters was significantly correlated with MPB biomass on the sediment surface on the mudflat and salt marsh, respectively. Resuspended diatoms over the mudflat during high tide shared a total of 54.3% similar species with diatoms recorded in flood tidal water over the salt marsh. Diatom taxa characteristic of salt marsh assemblages, and some deposited diatom taxa were resuspended and carried off the salt marsh during ebb tide. Resuspension of Chl. a in both flood and ebb waters was significantly controlled by the tidal range (both significant at p < 0.001). During spring tides, there was a net movement of characteristic MPB mudflat diatom taxa and sediment from the adjacent mudflat to the salt marsh, contributing to the accumulation of material within vegetated marshes during summer months.