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首页> 外文期刊>Polar biology >Microbial succession dynamics along glacier forefield chronosequences in Tierra del Fuego (Chile)
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Microbial succession dynamics along glacier forefield chronosequences in Tierra del Fuego (Chile)

机译：智利火地岛冰川前场时间序列上的微生物演替动力学

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B Following the retreat of a glacier, microbial colonization paves the way for future plant successions as nutrients are gradually introduced into the ecosystem. Characterizing the dynamics of this initial microbial colonization process is a key to understanding how these rapidly receding glacier areas are colonized. This study examines primary successions of bacteria, fungi and algae in two glacier forefields chronosequences on opposite slopes of Cordillera Darwin (Tierra del Fuego, Chile). Both slopes (southern and northern) show contrasting climate factors along with rapid rates of plant succession. Through a high-throughput sequencing approach, we identified Cyanobacteria as the dominant bacteria in younger soils close to the glacier terminus, whereas abundances of Alphaproteobacteria and Acidobacteria increased with soil surface age. Lichen-forming fungi and parasitic fungi were the most abundant fungal groups in younger succession stages, while saprophytic and mycorrhizal orders dominated later stages. The order Prasiolales predominated algal communities close to the glacier terminus, while Microthamniales and Chlamydomonadales orders dominated subsequent succession stages. Our observations reflect a changing community structure over time of the three microbial groups examined, and the replacement of taxa during the succession. Changes in composition are especially marked between the youngest succession states and subsequent ones in both forefields. Simultaneous analysis of bacterial, fungal and algal communities revealed the different trajectories of the three groups, with bacterial and fungal communities showing more marked succession patterns. Our results point to more relevant roles for bacteria at the initial stages of succession, while fungi could play a dominant role over bacteria as succession progresses. The ubiquity of algal taxa along the chronosequences was also observed. The two glacier forefields showed different microbial temporal dynamics, indicating that local factors affect the rate of microbial community assembly and, consequently, drive the primary succession process.
机译：B随着冰川的退缩，随着营养逐渐被引入生态系统，微生物定殖为未来的植物演替铺平了道路。表征最初微生物定殖过程的动力学特性是了解如何快速定居这些冰川后退冰川区域的关键。这项研究研究了在科尔迪勒拉达尔文（智利的火地岛）对面的两个斜坡上，两个冰川前场的时间序列中细菌，真菌和藻类的主要演替。两种斜坡（南部和北部）都显示出相反的气候因素以及快速的植物演替速度。通过高通量测序方法，我们确定了蓝细菌是靠近冰川终点的年轻土壤中的优势细菌，而随着土壤表面年龄的增加，丙酸杆菌和酸杆菌的丰度也随之增加。地衣形成真菌和寄生真菌是在较年轻的演替阶段中最丰富的真菌群，而腐生和菌根序则占后期。 Prasiolales阶在靠近冰川终点的藻类群落中占主导地位，而Microthamniales和Chlamydomonadales阶则在随后的演替阶段中占主导地位。我们的观察结果反映了所检查的三个微生物组随时间变化的群落结构，以及在继承过程中更换了分类单元。在这两个前场中，最小的继承状态与随后的继承状态之间的成分变化尤其明显。对细菌，真菌和藻类群落的同时分析显示了三组的轨迹不同，细菌和真菌群落显示出更明显的演替模式。我们的研究结果表明，细菌在继承的初始阶段具有更重要的作用，而真菌在继承过程中可能比细菌起主导作用。沿时间序列也观察到了藻类群的普遍存在。这两个冰川的前场显示出不同的微生物时间动态，表明局部因素影响微生物群落组装的速率，并因此驱动主要演替过程。

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