Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions
Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions
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霍恩松德（斯瓦尔巴群岛）沉积物中的藻类色素作为北极生产力和环境条件的生物标志物
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发表时间：
2017
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影响因子：
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通讯作者：
G. Kowalewska
中科院分区：
文献类型：
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作者：
M. Krajewska;M. Szymczak;G. Kowalewska
对2015年7月和2016年7月在霍恩松德采集的沉积物和大型藻类样品中的色素(氯色素-a和类胡萝卜素)进行了分析(高效液相色谱法)。尽管北极环境中的有氧条件和周期性的强烈太阳辐射都不利于色素在水柱和表层沉积物中的保存，但我们的结果表明，这些化合物可以提供该地区浮游植物组成、初级生产力和环境条件的信息。霍恩松德沉积物中初级生产力的标志物--氯化色素的总量在0.40~14.97nmol/gD.W.之间变化，类胡萝卜素的总量在0.58~8.08nmol/gD.W.之间变化。在这些沉积物中，褐藻a和焦褐藻a在氯色素a总量中所占比例最高，为浮游动物和/或底栖动物的密集捕食提供了证据。在类胡萝卜素中，岩藻黄质及其衍生物(19‘-己酰氧基岩藻黄质和19’-己酰氧基-4-酮-岩藻黄质)所占比例最高，表明水中主要存在硅藻和/或触生植物。色素标记表明，只有在潮间带，大型藻类对总生物量的输入才可能相当可观。
Pigments (chloropigments-a and carotenoids) in sediments and macroalgae samples, collected in Hornsund, in July 2015 and July 2016, were analysed (HPLC) in this work. In spite of the aerobic conditions and the periodic intensive solar irradiation in the Arctic environment, neither of which favour pigment preservation in water column and surface sediments, our results indicate that these compounds can provide information about phytoplankton composition, primary production and environmental conditions in this region. The sum of chloropigments-a, a marker of primary production, in the Hornsund sediments varied from 0.40 to 14.97 nmol/g d.w., while the sum of carotenoids ranged from 0.58 to 8.08 nmol/g d.w. Pheophorbides-a and pyropheophorbides-a made up the highest percentage in the sum of chloropigments-a in these sediments, supplying evidence for intensive zooplankton and/or zoobenthos grazing. Among the carotenoids, fucoxanthin and its derivatives (19’-hexanoyloxyfucoxanthin and 19’-hexanoyloxy-4-ketofucoxanthin) contributed the highest percentage, which points to the occurrence mainly of diatoms and/or haptophytes in the water. The pigment markers show that the input of macroalgae to the total biomass could be considerable only in the intertidal zone.