Cyanobacteria-derived nitrogen uptake by benthic invertebrates in Lake Taihu: a mesocosm study using N-15 labeling
Cyanobacteria-derived nitrogen uptake by benthic invertebrates in Lake Taihu: a mesocosm study using N-15 labeling
复制标题
太湖底栖无脊椎动物对蓝藻氮的吸收：使用 N-15 标记的中生态系统研究
DOI：
10.1051/kmae/2014033
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发表时间：
2014
影响因子：
1.8
通讯作者：
Jeppesen E.
中科院分区：
文献类型：
--
作者：
Yu J.;He H.;Liu Z.;Li K.;Hu Y.;Zhong P.;Jeppesen E.
湖泊的富营养化会导致蓝藻的优势，而蓝藻由于营养价值低，很难被浮游动物利用。然而，沉积的蓝藻碎屑可能是底栖无脊椎动物的有用来源。以稳定同位素氮（15N）为示踪剂，研究了太湖底栖无脊椎动物对微囊藻氮的参入。添加标记微囊藻碎屑后，各生物的δ 15 N值均随时间显著增加，其中POM和附着生物的δ 15 N值峰值早于底栖无脊椎动物，最大值也高于双壳类、螺类和蠕虫。在底栖无脊椎动物中，水芹的峰值晚于其他无脊椎动物，但最后一次采样日的最高水平和过量15 N较高。在实验结束时，大约70%的added15N被保留在底栖食物网，而只有一小部分（小于1%）的addeddetritus15N发生在中上层食物网。我们的研究结果表明，氮从蓝藻可以纳入更多的底栖比浮游食物网和蓝藻水华可能有助于底栖动物的发展。
Eutrophication of lakes can lead to dominance by cyanobacteria, which are hardly used by zooplankton due to their low nutrition value. However, sedimented cyanobacterial detritus may be a useful source for benthic invertebrates. We studied theMicrocystis-derived nitrogen incorporation in benthic invertebrates in Lake Taihu using stable isotopic nitrogen (15N) as a tracer. Theδ15N of all organisms increased significantly with time after addition of the labeledMicrocystisdetritus.δ15N values of POM and periphyton peaked earlier than for benthic invertebrates, and the maximum levels were also higher than bivalves, snails and worms (Limnodrilusspp.). Among benthic invertebrates,Radix swinhoeipeaked later than other invertebrates, but the maximum level and the excess15N of the last sampling day were higher. At the end of the experiment, approximately 70% of the added15N was retained in the benthic food web, while only a small fraction (less than 1%) of the added detritus15N occurred in the pelagic food web. Our results suggest that nitrogen from cyanobacteria can be incorporated more in benthic than pelagic food webs and cyanobacterial blooms may contribute to the development of benthic animals.