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首页> 外文期刊>Estuarine Coastal and Shelf Science >Intertidal foraminifera and stable isotope geochemistry from world's largest mangrove, Sundarbans: Assessing a multiproxy approach for studying changes in sea-level
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Intertidal foraminifera and stable isotope geochemistry from world's largest mangrove, Sundarbans: Assessing a multiproxy approach for studying changes in sea-level

机译：来自世界上最大的红树林Sundarbans的潮间孔有孔虫和稳定同位素地球化学：评估研究海平面变化的多代理方法

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Recent changes in sea level have appeared as a major threat to the existence of coastal habitats like mangroves and to the biodiversity characterizing such habitats. In this study benthic foraminifer analysis along with carbon isotopes (delta C-13 parts per thousand) and ratio between organic Carbon and Nitrogen (C/N) were analyzed from five intertidal stations in Sundarbans, the world's largest mangrove ecosystem to test the efficiency of these signatures toward tracking relative rise in sea level. The stability of these signatures with respect to gap of twenty months across varying elevations of the targeted stations has been tested. Benthic foraminifer abundance ranged from 0 to 118 individuals per 10 g and the assemblage was found to be mostly dominated by agglutinated species. The delta C-13 parts per thousand values (-26.6 to 23.8) reflected that the origin of carbon is majorly from vascular land plants in some inputs from estuarine phytoplankton that are known to characterize tidal water of Sundarbans. The values of C/N (0.48-1.43) represented a microbially degraded total organic carbon (TOC) pool and thus were not a suitable proxy. Out of three signatures, delta C-13 parts per thousand showed a strong co-relation with elevation and thus could be used as a reliable proxy to track relative sea level rise in mangrove environments. (C) 2017 Elsevier Ltd. All rights reserved.
机译：最近的海平面变化已成为对诸如红树林之类的沿海生境的生存以及对此类生境特征的生物多样性的重大威胁。在这项研究中，对全球最大的红树林生态系统Sundarbans的五个潮间站进行了底栖有孔虫分析以及碳同位素（δC-13千分之一）和有机碳与氮之比（C / N）的分析，以测试底栖有孔虫的效率。这些特征可以追踪海平面的相对上升。这些信号相对于目标站不同高度的二十个月间隙的稳定性已经过测试。底栖有孔虫的丰度范围为每10克0至118个个体，发现该群体主要由凝集的物种主导。每千分之C-13值（-26.6至23.8）反映出，碳的来源主要来自维管河浮游植物某些投入物中的维管陆地植物，已知这些物质表征了桑达班斯的潮水。 C / N值（0.48-1.43）代表微生物降解的总有机碳（TOC）库，因此不是合适的替代指标。在三个特征中，千分之十的C-13含量与海拔高度密切相关，因此可以用作跟踪红树林环境中相对海平面上升的可靠代理。 （C）2017 Elsevier Ltd.保留所有权利。

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