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首页> 外文期刊>Estuarine Coastal and Shelf Science >Decreased production of surface-active organic substances as a consequence of the oligotrophication in the northern Adriatic Sea
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Decreased production of surface-active organic substances as a consequence of the oligotrophication in the northern Adriatic Sea

机译：亚得里亚海北部的低营养化导致表面活性有机物质的产量减少

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摘要

The dynamics of surface-active substances (SAS) in the northern Adriatic Sea were studied based on monthly sampling from 1998 to 2010. The data from two stations on the eastern and the western part of the northern Adriatic basin, differing significantly in terms of their trophic status, are presented and discussed. As a consequence of oligotrophication the concentration of SAS, primarily produced by phytoplankton, decreased lately (period 2005-2010) in the upper water column. A higher decrease was observed at a site further away from the influence of freshwater, implying that oligotrophic regions are much more sensible to the environmental changes. Besides the change in SAS concentration, the changes in its distribution between the dissolved and the paniculate fraction and their acidity characteristics along the water column have been also observed in the recent period. We suggest that production of SAS shifted to deeper layers. This probably due to the phytoplankton depth increasing in response to the changed vertical distribution of nutrients. This implies increased importance of regenerated nutrients near the bottom for the phytoplankton blooming lately. In the period 2005-2010 pico- and nano-phytoplankton might significantly contribute to new SAS production near the bottom during summer. The observed changes of SAS may result in the changes of biogeochemical cycling of macro- and microconstituents of sea.
机译：根据1998年至2010年的月度抽样研究了北部亚得里亚海的表面活性物质（SAS）的动力学。来自北部亚得里亚海盆地东部和西部的两个站点的数据，其差异很大营养状态，介绍和讨论。低营养化的结果是，主要由浮游植物产生的SAS浓度最近在上水柱中降低（2005-2010年）。在远离淡水影响的地方观察到更高的减少量，这表明贫营养区对环境变化更敏感。除了SAS浓度的变化外，最近一段时间还观察到了其在溶解部分和颗粒部分之间的分布及其沿水柱的酸度特征的变化。我们建议SAS的生产转移到更深层次。这可能是由于浮游植物的深度随着养分垂直分布的变化而增加。这意味着对于浮游植物最近开花，底部附近的再生养分的重要性增加。在2005-2010年期间，微浮游植物和纳米浮游植物可能在夏季接近底部的新SAS生产中发挥重要作用。观测到的SAS变化可能会导致海洋的宏观和微观成分的生物地球化学循环发生变化。

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