Variability in the origin of carbon substrates for bacterial communities in mangrove sediments
Variability in the origin of carbon substrates for bacterial communities in mangrove sediments
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DOI：
10.1016/j.femsec.2004.03.004
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发表时间：
2004-08-01
影响因子：
4.2
通讯作者：
Dehairs, F
中科院分区：
文献类型：
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作者：
Bouillon, S;Moens, T;Dehairs, F
红树林沉积物中的有机碳来源于本地来源（红树林、微型底栖植物）和潮汐输入（如浮游植物、海草衍生物）。这些源的相对输入可能会有很大的不同，在不同的红树林网站内和之间。我们结合元素（TOC/TN）和散装δ（13）C分析从不同的红树林网站的沉积物芯与δ（13）C数据的细菌特异性磷脂脂肪酸（PLFA），以确定占主导地位的碳底物所使用的原位细菌群落。这些标志物的δ（13）C值在不同地点和采样深度的范围为10 ppm或更高，但总体上遵循在散装有机碳中观察到的δ（13）C趋势。几个沉积物岩心显示PLFA三角洲（13）C有很强的垂直梯度，表明表层藻类碳的选择性。我们的数据表明，细菌碳底物的起源在不同的红树林网站有很大的不同，并意味着，数据矿化的有机物不能直接纳入生态系统的碳预算没有估计的各种来源的贡献。(C)2004年，欧洲微生物学会联合会。出版社：Elsevier 13 N All rights reserved.
Organic carbon in mangrove sediments originates from both local sources (mangroves, microphytobenthos) and tidal inputs (e.g. phytoplankton, seagrass-derived material). The relative inputs of these Sources may vary strongly, both within and between different mangrove sites. We combined elemental (TOC/TN) and bulk delta(13)C analysis on sediment cores from various mangrove sites with delta(13)C data of bacteria-specific phospholipid fatty acids (PLFA) in order to identify the dominant carbon substrates used by in situ bacterial communities. delta(13)C values of each of these markers showed a range of 10parts per thousand or more across the different sites and sampling depths, but generally followed the delta(13)C trend observed in bulk organic carbon. Several sediment cores show a strong vertical gradient in PLFA delta(13)C, suggesting a selectivity for algal-derived carbon in the surface layers. Our data demonstrate that the origin of bacterial carbon substrates varies widely across different mangrove sites, and imply that data on mineralization of organic matter cannot be directly incorporated in ecosystem carbon budgets without an estimation of the contribution of various Sources. (C) 2004 Federation of European Microbiological Societies. Published by Elsevier 13N. All rights reserved.