Taraxerol and Rhizophora pollen as proxies for tracking past mangrove ecosystems 1 1 Associate edito
Taraxerol and Rhizophora pollen as proxies for tracking past mangrove ecosystems 1 1 Associate edito
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DOI：
10.1016/s0016-7037(03)00456-3
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发表时间：
2004-02
影响因子：
5
通讯作者：
G. Versteegh;E. Schefuß;L. Dupont;F. Marret;Jaap S. Sinninghe Damsté;J. Jansen
中科院分区：
文献类型：
--
作者：
G. Versteegh;E. Schefuß;L. Dupont;F. Marret;Jaap S. Sinninghe Damsté;J. Jansen
安哥拉盆地和开普盆地（大西洋东南部）的表层沉积物和沉积物岩心表明，蒲公英萜醇丰度的最大值（相对于其他陆地来源的脂质）与Rhizophora属红树林树花粉相对丰度的最大值存在协变，在近海表层沉积物中，蒲公英萜醇相对丰度的最大值出现在沿海红树林丰富的纬度。结合Rhizophora mangle和Rhizophora racemosa叶中蒲公英萜醇含量异常丰富的观察结果，这强烈表明蒲公英萜醇可用作输入东南大西洋的红树林的脂质生物标志物。蒲公英素和Rhizophora花粉的代理环境关系的核心表明，增加蒲公英素和Rhizophora花粉丰度发生在海侵和潮湿的气候时期。这些环境变化改变了海岸侵蚀和沉积模式，扩大了红树林生态系统的范围和/或红树林有机物向近海的迁移。中更新世沉积物的分析表明，在岁差极小期间，蒲公英素最大值模式的中断几乎只发生在低结晶度期间。这表明了复杂的环境响应之间的相互作用的岁差相关的湿度循环和湿度相关的海平面变化的红树林输入。
Angola Basin and Cape Basin (southeast Atlantic) surface sediments and sediment cores show that maxima in the abundance of taraxerol (relative to other land-derived lipids) covary with maxima in the relative abundance of pollen from the mangrove tree genus Rhizophora and that in the surface sediments offshore maxima in the relative abundance of taraxerol occur at latitudes with abundant coastal mangrove forests. Together with the observation that Rhizophora mangle and Rhizophora racemosa leaves are extraordinarily rich in taraxerol, this strongly indicates that taraxerol can be used as a lipid biomarker for mangrove input to the SE Atlantic. The proxy-environment relations for taraxerol and Rhizophora pollen down-core show that increased taraxerol and Rhizophora pollen abundances occur during transgressions and periods with a humid climate. These environmental changes modify the coastal erosion and sedimentation patterns, enhancing the extent of the mangrove ecosystem and/or the transport of mangrove organic matter offshore. Analyses of mid-Pleistocene sediments show that interruption of the pattern of taraxerol maxima during precession minima occurs almost only during periods of low obliquity. This demonstrates the complex environmental response of the interaction between precession-related humidity cycles and obliquity-related sea-level changes on mangrove input.