Effects of zooplankton carcasses degradation on freshwater bacterial community composition and implications for carbon cycling

Effects of zooplankton carcasses degradation on freshwater bacterial community composition and implications for carbon cycling
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浮游动物尸体降解对淡水细菌群落组成的影响及其对碳循环的影响

DOI:
10.1111/1462-2920.14418
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发表时间:
2019
期刊:
bioRxiv
影响因子:
--
通讯作者:
Grossart
Grossart
中科院分区:
--
文献类型:
--
作者:
Kolmakova;Gladyshev;Fonvielle;Ganzert;Hornick;Grossart

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浮游动物的非捕食性死亡为水生生态系统中高质量的不稳定有机物(LOM)提供了丰富的,但很少研究的来源。利用实验室微宇宙,我们跟踪了天然浮游细菌对新鲜13C标记水蚤类有机碳的分解。实验装置包括空白微宇宙,即没有任何有机质添加物的人工湖水(B),以及用天然腐殖物质(H)、新鲜水蚤壳(D)或两者(即腐殖物质和水蚤壳)改良的微宇宙(HD)。大部分的尸体碳消耗和呼吸的细菌群落在15天的孵化。观察到由不稳定的尸体碳和腐殖物质形成的细菌群落组成的变化。然而,我们没有观察到腐殖物质降解的异养细菌的存在下,来自尸体的LOM的定量变化。然而,尸体是驱动细菌群落组成的主要因素,这表明大量死亡浮游动物的存在可能会影响水生生态系统中的碳循环。我们的研究结果意味着,来自浮游动物尸体的有机物是有效的微生物化由一个高度特定的细菌群落,但不干扰细菌营业额更难降解的腐殖物质。
Non‐predatory mortality of zooplankton provides an abundant, yet, little studied source of high quality labile organic matter (LOM) in aquatic ecosystems. Using laboratory microcosms, we followed the decomposition of organic carbon of fresh13C‐labelledDaphniacarcasses by natural bacterioplankton. The experimental setup comprised blank microcosms, that is, artificial lake water without any organic matter additions (B), and microcosms either amended with natural humic matter (H), freshDaphniacarcasses (D) or both, that is, humic matter andDaphniacarcasses (HD). Most of the carcass carbon was consumed and respired by the bacterial community within 15 days of incubation. A shift in the bacterial community composition shaped by labile carcass carbon and by humic matter was observed. Nevertheless, we did not observe a quantitative change in humic matter degradation by heterotrophic bacteria in the presence of LOM derived from carcasses. However, carcasses were the main factor driving the bacterial community composition suggesting that the presence of large quantities of dead zooplankton might affect the carbon cycling in aquatic ecosystems. Our results imply that organic matter derived from zooplankton carcasses is efficiently remineralized by a highly specific bacterial community, but does not interfere with the bacterial turnover of more refractory humic matter.
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