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首页> 外文期刊>Estuarine Coastal and Shelf Science >Contemporary distribution of benthic foraminiferal assemblages in coastal wetlands of south-eastern Australia
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Contemporary distribution of benthic foraminiferal assemblages in coastal wetlands of south-eastern Australia

机译：澳大利亚东南部沿海湿地底湿地组装的当代分布

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摘要

Benthic foraminifera identified from the upper intertidal zone of coastal mangrove and saltmarsh wetlands of south-eastern Australia exhibit spatial zonation that varies with elevation and corresponds to position in the tidal frame. This study describes relationships between benthic foraminiferal assemblages and environmental variables, such as wetland elevation, pore-water salinity, substrate organic matter content and sediment grainsize. Agglutinated taxa dominated higher in the tidal frame, whereas calcareous taxa increased in both relative abundance and diversity lower in the tidal frame. Species composition varied within and between study sites, reflecting local differences in other environmental variables. Three major spatial clusters were identified in the upper intertidal zone from a dataset consisting of 111 contemporary samples: a high-to mid-elevation assemblage consisting of differing abundances of Entzia macrescens and Trochammina inflata; a mid-elevation assemblage comprised of Arenoparrella mexicana in association with Trochammina inflata and Quinqueloculina seminula; and mid-to low-elevation assemblage characterised by Cribroelphidium excavatum, Quinqueloculina seminula, Ammobaculites spp. and Miliammina fusca. Multivariate analysis correlated foraminiferal assemblages with environmental variables showing that foraminiferal distribution in the region is constrained primarily by wetland elevation, but also by pore-water salinity. Foraminiferal assemblages derived from cluster analysis correlated with vegetation zones, implying that both foraminifera and vegetation are influenced by elevation and salinity. This paper seeks to demonstrate that the consistency in spatial zonation of assemblages provides greater confidence that contemporary distribution of foraminiferal assemblages can assist with the interpretation of past depositional conditions and palaeo-environmental reconstructions, providing insights into the evolution of coastal wetlands of south-eastern Australia over the Holocene.
机译：从澳大利亚东南部的沿海红树林和Saltmarsh湿地鉴定的Benthic foraminifera展示了随着升降的空间区划，并对应于潮汐框架中的位置。本研究描述了底栖多峰组装和环境变量之间的关系，例如湿地升高，孔隙水分，底物有机物质含量和沉积物脂肪。在潮汐框架中凝固的分类群在潮汐框架中占主导地位，而换流量在潮汐框架中的相对丰富和多样性均增加。物种组成在研究场所内部和之间变化，反映了其他环境变量的局部差异。从由111个现代样品组成的数据集中的上层透射区中识别了三个主要空间簇：高到中高升高组合，由不同的偏振麦克风和杂交灌输组成;中升高的组合组成，由秋尾藻露墨西哥与Trocochamina intaata和喹啉南娜群集组成;中到低升高的组合，其特征在于Cribroelphidium ExcavaTum，喹啉脲泡沫，Ammobaculites SPP。和miliammina fusca。多变量分析与环境变量相关的传染率组装，显示该区域的火花素分布主要受湿地升高的约束，也通过孔水盐度约束。源自植被区的聚类分析的多孔组装暗示，迫切然意味着植被和植被都受到升高和盐度的影响。本文旨在表明，组装空间区划的一致性提供了更大的信心，即当代传染率组装的当代分布可以帮助解释过去的沉积条件和古兰经环境重建，为澳大利亚东南部沿海湿地的演变提供了深入的洞察力在全新世。

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