Feasting on terrestrial organic matter: Dining in a dark lake changes microbial decomposition.
Feasting on terrestrial organic matter: Dining in a dark lake changes microbial decomposition.
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在陆地有机物上盛宴：黑暗湖中的用餐会改变微生物分解。
DOI：
10.1111/gcb.14391
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发表时间：
2018-11
影响因子：
11.6
通讯作者：
Tanentzap AJ
中科院分区：
文献类型：
--
作者：
Fitch A;Orland C;Willer D;Emilson EJS;Tanentzap AJ
北方湖泊是全球碳循环的主要组成部分，部分原因是沉积物中的异养微生物在湖泊和陆地来源的有机物（t-OM）中分解。沉积物细菌分解和改变t-OM的能力可能取决于环境特征和群落组成。然而，这两个潜在的分解驱动因素之间的联系却知之甚少。我们测试了细菌活性如何沿着沿着实验梯度在质量和数量上改变t-OM输入到两个小型北方湖泊的沿岸的沉积物中，一个黑暗的湖泊和一个清澈的湖水，并测量了操作分类单元和功能基因的丰度，以确定细菌反应的机制。我们发现，细菌生产（BP）下降，整个湖泊与芳香族溶解有机物（DOM）在沉积物孔隙水，但这种模式的过程不同的湖泊之间。黑暗湖泊中的细菌投资于昂贵的胞外酶生产，因为沉积物中芳香DOM的可用性增加。相比之下，清澈的湖水中的细菌可能缺乏降解芳香DOM的营养物质和/或遗传潜力，而是将OM矿化为CO2。这两个湖泊不同的社区组成，与浓度的溶解有机碳和pH值区分微生物组合。此外，与t-OM降解相关的功能基因在暗湖中相对较高。我们的研究结果表明，未来湖泊沉积物中t-OM输入的变化将对碳循环产生不同的影响，这取决于OM光降解的潜力和常驻细菌群落的组成。
Boreal lakes are major components of the global carbon cycle, partly because of sediment‐bound heterotrophic microorganisms that decompose within‐lake and terrestrially derived organic matter (t‐OM). The ability for sediment bacteria to break down and alter t‐OM may depend on environmental characteristics and community composition. However, the connection between these two potential drivers of decomposition is poorly understood. We tested how bacterial activity changed along experimental gradients in the quality and quantity of t‐OM inputs into littoral sediments of two small boreal lakes, a dark and a clear lake, and measured the abundance of operational taxonomic units and functional genes to identify mechanisms underlying bacterial responses. We found that bacterial production (BP) decreased across lakes with aromatic dissolved organic matter (DOM) in sediment pore water, but the process underlying this pattern differed between lakes. Bacteria in the dark lake invested in the energetically costly production of extracellular enzymes as aromatic DOM increased in availability in the sediments. By contrast, bacteria in the clear lake may have lacked the nutrients and/or genetic potential to degrade aromatic DOM and instead mineralized photo‐degraded OM into CO2. The two lakes differed in community composition, with concentrations of dissolved organic carbon and pH differentiating microbial assemblages. Furthermore, functional genes relating to t‐OM degradation were relatively higher in the dark lake. Our results suggest that future changes in t‐OM inputs to lake sediments will have different effects on carbon cycling depending on the potential for photo‐degradation of OM and composition of resident bacterial communities.
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影响因子：
2.5
作者：
COLE, JJ;FINDLAY, S;PACE, ML
通讯作者：
PACE, ML
Biopython：用于计算分子生物学和生物信息学的免费 Python 工具。
DOI：
10.1093/bioinformatics/btp163
发表时间：
2009-06-01
期刊：
Bioinformatics (Oxford, England)
影响因子：
--
作者：
Cock PJ;Antao T;Chang JT;Chapman BA;Cox CJ;Dalke A;Friedberg I;Hamelryck T;Kauff F;Wilczynski B;de Hoon MJ
通讯作者：
de Hoon MJ
影响因子：
11
作者：
Bertilsson, Stefan;Eiler, Alexander;Jorgensen, Niels Ole Gerslev
通讯作者：
Jorgensen, Niels Ole Gerslev
影响因子：
8.8
作者：
Berggren, M.;Strom, L.;Jansson, M.
通讯作者：
Jansson, M.
影响因子：
4.4
作者：
Anesio, AM;Granéli, W;Mopper, K
通讯作者：
Mopper, K