Namib Desert Soil Microbial Community Diversity, Assembly, and Function Along a Natural Xeric Gradient

被引:57
|
作者
Scola, Vincent [1 ]
Ramond, Jean-Baptiste [2 ]
Frossard, Aline [2 ,3 ]
Zablocki, Olivier [4 ]
Adriaenssens, Evelien M. [2 ,5 ]
Johnson, Riegardt M. [2 ]
Seely, Mary [6 ,7 ]
Cowan, Don A. [2 ]
机构
[1] Univ Pretoria, Dept Microbiol, Ctr Microbial Ecol & Genom CMEG, Pretoria, South Africa
[2] Univ Pretoria, Dept Genet, Ctr Microbial Ecol & Genom CMEG, Pretoria, South Africa
[3] Swiss Fed Inst Forest Snow & Landscape Res WSL, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland
[4] Univ Western Cape, Inst Microbial Biotechnol & Metagen, Cape Town, South Africa
[5] Univ Liverpool, Inst Integrat Biol, Liverpool, Merseyside, England
[6] Gobabeb Res & Training Ctr, Walvis Bay, Namibia
[7] Desert Res Fdn Namibia DRFN, Windhoek, Namibia
基金
新加坡国家研究基金会;
关键词
Aridity gradient; Xeric stress; Edaphic desert microbial communities; Extracellular enzyme activities; Dryland; BACTERIAL COMMUNITIES; ENZYME-ACTIVITY; ECOLOGY; FOG; BACTERIOPHAGES; OPTIMIZATION; METAVIROMICS; TEMPERATURE; DEPOSITION; ABUNDANCE;
D O I
10.1007/s00248-017-1009-8
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The hyperarid Namib desert is a coastal desert in southwestern Africa and one of the oldest and driest deserts on the planet. It is characterized by a west/east increasing precipitation gradient and by regular coastal fog events (extending up to 75 km inland) that can also provide soil moisture. In this study, we evaluated the role of this natural aridity and xeric gradient on edaphic microbial community structure and function in the Namib desert. A total of 80 individual soil samples were collected at 10-km intervals along a 190-km transect from the fog-dominated western coastal region to the eastern desert boundary. Seventeen physicochemical parameters were measured for each soil sample. Soil parameters reflected the three a priori defined climatic/xeric zones along the transect ("fog," "low rain," and "high rain"). Microbial community structures were characterized by terminal restriction fragment length polymorphism fingerprinting and shotgun metaviromics, and their functional capacities were determined by extracellular enzyme activity assays. Both microbial community structures and activities differed significantly between the three xeric zones. The deep sequencing of surface soil metavirome libraries also showed shifts in viral composition along the xeric transect. While bacterial community assembly was influenced by soil chemistry and stochasticity along the transect, variations in community "function" were apparently tuned by xeric stress.
引用
收藏
页码:193 / 203
页数:11
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