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首页> 外文期刊>Estuarine Coastal and Shelf Science >The distribution of sterols and organic-walled dinoflagellate cysts in surface sediments of the North-western Adriatic Sea (Italy)
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The distribution of sterols and organic-walled dinoflagellate cysts in surface sediments of the North-western Adriatic Sea (Italy)

机译：西北亚得里亚海（意大利）表层沉积物中固醇和有机壁的鞭毛藻囊肿的分布

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摘要

The distributions of sterols and organic-walled dinoflagellate cysts (dinocysts) in five NW Adriatic Sea surface sediment samples were investigated. Samples are representative of areas differently influenced by freshwater inputs, mainly coming from the Po River. All the investigated samples exhibit the same suite of principal sterols, with cholest-5-en-3β-ol (cholesterol), 4α,23,24-trimethyl-5α-cholest-22E-en-3β-ol (dinosterol), 24-ethylcholest-5-en-3β-ol (sitosterol) and 24-methylcholesta-5,22E-dien-3β-ol (brassicasterol or epibrassicasterol) displaying the highest concentrations and relative abundances. The distribution of sterols in the samples is not related to their distance from the coast and/or with the C/N ratios and suggests a prevalent input of marine, autochthonous organic matter in the surface sediments. In particular, the high abundance of dinosterol underlines the importance of dinoflagellate productivity in this area and its contribution to the organic matter in sediments. However, absolute and relative abundances of dinosterol do not follow the trend observed for dinocyst concentrations in the investigated samples, with the exception of Spiniferites spp. cysts and cysts produced by Gonyaulax species.
机译：研究了五个西北亚得里亚海表面沉积物样品中的固醇和有机壁的鞭毛藻囊肿（恐龙囊）的分布。样本代表受主要来自波河的淡水输入影响不同的区域。所有研究的样品均显示出相同的主要固醇，其中胆固醇5-en-3β-ol（胆固醇），4α，23,24-三甲基-5α-胆固醇22E-en-3β-ol（地甾醇），24 -乙基胆甾-5-烯-3β-醇（谷甾醇）和24-甲基胆甾-5,22E-dien-3β-醇（溴西雌酚或表溴西雌醇）显示出最高的浓度和相对丰度。样品中固醇的分布与它们与海岸的距离和/或C / N比无关，它表明表层沉积物中普遍存在海洋，土生有机物。特别是，丰富的恐龙甾醇强调了该地区鞭毛生产力的重要性及其对沉积物中有机物的贡献。但是，除棘孢菌属菌种外，在所研究的样品中，藻甾醇的绝对和相对丰度没有遵循所观察到的藻囊浓度的趋势。囊肿和Gonyaulax物种产生的囊肿。

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