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Physicochemical Parameters Affecting the Distribution and Diversity of the Water Column Microbial Community in the High-Altitude Andean Lake System of La Brava and La Punta.
Microorganisms ( IF 4.5 ) Pub Date : 2020-08-03 , DOI: 10.3390/microorganisms8081181
Reynaldo Núñez Salazar 1 , Carlos Aguirre 2 , Jorge Soto 1, 3 , Pamela Salinas 1 , Carlos Salinas 1 , Humberto Prieto 2 , Manuel Paneque 3
Affiliation  

Due to the low incidence of precipitation attributed to climate change, many high-altitude Andean lakes (HAALs) and lagoons distributed along the central Andes in South America may soon disappear. This includes La Brava–La Punta, a brackish lake system located south of the Salar de Atacama within a hyper-arid and halophytic biome in the Atacama Desert. Variations in the physicochemical parameters of the water column can induce changes in microbial community composition, which we aimed to determine. Sixteen sampling points across La Brava–La Punta were studied to assess the influence of water physicochemical properties on the aquatic microbial community, determined via 16S rRNA gene analysis. Parameters such as pH and the concentrations of silica, magnesium, calcium, salinity, and dissolved oxygen showed a more homogenous pattern in La Punta samples, whereas those from La Brava had greater variability; pH and total silica were significantly different between La Brava and La Punta. The predominant phyla were Proteobacteria, Bacteroidetes, Actinobacteria, and Verrucomicrobia. The genera Psychroflexus (36.85%), Thiomicrospira (12.48%), and Pseudomonas (7.81%) were more abundant in La Brava, while Pseudospirillum (20.73%) and Roseovarius (17.20%) were more abundant in La Punta. Among the parameters, pH was the only statistically significant factor influencing the diversity within La Brava lake. These results complement the known microbial diversity and composition in the HAALs of the Atacama Desert.

中文翻译:

影响拉布拉瓦和蓬塔高海拔安第斯湖系统中水柱微生物群落分布和多样性的理化参数。

由于归因于气候变化的降水发生率较低,因此在南美安第斯山脉中部分布的许多高海拔安第斯湖泊(HAAL)和泻湖可能很快消失。这包括La Brava–La Punta,这是一个微咸的湖泊系统,位于阿塔卡马沙漠撒拉族人在阿塔卡马沙漠南部的一个超干旱和盐生植物群落中。水柱理化参数的变化会引起微生物群落组成的变化,这是我们旨在确定的。通过16S rRNA基因分析确定了La Brava–La Punta上的16个采样点,以评估水的理化性质对水生微生物群落的影响。参数,例如pH值以及二氧化硅,镁,钙,盐度,La Punta样品中的溶解氧表现出更均匀的模式,而La Brava样品中的溶解氧具有更大的变异性。La Brava和La Punta之间的pH和总二氧化硅含量显着不同。主要的门是变形杆菌,拟杆菌,放线菌和疣状微生物。属拉布拉瓦岛的Psychroflexus(36.85%),Thiomicrospira(12.48%)和Pseudomonas(7.81%)含量较高,而La Punta的Pseudospirillum(20.73%)和Roseovarius(17.20%)含量较高。在这些参数中,pH是影响拉布拉瓦湖内多样性的唯一具有统计学意义的因素。这些结果补充了阿塔卡马沙漠HAAL中已知的微生物多样性和组成。
更新日期:2020-08-03
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