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首页> 外文期刊>Estuarine Coastal and Shelf Science >Influence of allochthonous dissolved organic matter on pelagic basal production in a northerly estuary
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Influence of allochthonous dissolved organic matter on pelagic basal production in a northerly estuary

机译：北部河口异源溶解有机质对浮游基岩产量的影响

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Phytoplankton and heterotrophic bacteria are key groups at the base of aquatic food webs. In estuaries receiving riverine water with a high content of coloured allochthonous dissolved organic matter (ADOM), phytoplankton primary production may be reduced, while bacterial production is favoured. We tested this hypothesis by performing a field study in a northerly estuary receiving nutrient-poor, ADOM-rich riverine water, and analyzing results using multivariate statistics. Throughout the productive season, and especially during the spring river flush, the production and growth rate of heterotrophic bacteria were stimulated by the riverine inflow of dissolved organic carbon (DOC). In contrast, primary production and photosynthetic efficiency (i.e. phytoplankton growth rate) were negatively affected by DOC. Primary production related positively to phosphorus, which is the limiting nutrient in the area. In the upper estuary where DOC concentrations were the highest, the heterotrophic bacterial production constituted almost 100% of the basal production (sum of primary and bacterial production) during spring, while during summer the primary and bacterial production were approximately equal. Our study shows that riverine DOC had a strong negative influence on coastal phytoplankton production, likely due to light attenuation. On the other hand DOC showed a positive influence on bacterial production since it represents a supplementary food source. Thus, in boreal regions where climate change will cause increased river inflow to coastal waters, the balance between phytoplankton and bacterial production is likely to be changed, favouring bacteria. The pelagic food web structure and overall productivity will in turn be altered. (C) 2018 The Authors. Published by Elsevier Ltd.
机译：浮游植物和异养细菌是水生食物网基础上的关键群体。在接受河水中含有大量异色可溶性有机物（ADOM）的河口中，浮游植物的初级产量可能会减少，而细菌的数量却会增加。我们通过在北河口接受贫营养，富含ADOM的河水进行田间研究，并使用多元统计数据分析结果，从而检验了这一假设。在整个生产季节中，特别是在春季河道冲刷期间，异养细菌的产生和生长速率受到河流中溶解有机碳（DOC）的流入的刺激。相反，初级生产力和光合作用效率（即浮游植物的生长速度）受到DOC的负面影响。初级生产与磷呈正相关，磷是该地区的限制性养分。在DOC浓度最高的河口，春季，异养细菌的产量几乎占基础产量（初级和细菌产量之和）的100％，而在夏季，初级和细菌产量大致相等。我们的研究表明，河流DOC对沿海浮游植物的生产具有强烈的负面影响，这可能是由于光衰减所致。另一方面，DOC对细菌的产生有积极影响，因为它代表了一种补充食物来源。因此，在气候变化将导致河流增加流入沿海水域的北方地区，浮游植物和细菌产量之间的平衡可能会发生变化，从而有利于细菌。中上层食物网的结构和整体生产力将随之改变。 （C）2018作者。由Elsevier Ltd.发布

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