对受监管河流的附带流入会影响细菌群落并增加细菌的碳同化
Lauren O'Brien1, Nachshon Siboni2, Justin R Seymour2
1School of Life Sciences, University of Technology Sydney, Ultimo, NSW, Australia. lauren.e.obrien@student.uts.edu.au.
Microbial ecology
|July 22, 2023
概括
附带的流入大大改变了河流细菌群落和碳同化. 虽然细菌的碳产量最初下降,但由于河流流量增加,细菌吸收的总碳量大幅增加.
科学领域:
- 河流生态系统生态学
- 微生物生态学 微生物生态学
- 环境科学环境科学
背景情况:
- 附带流量显著影响受监管河流的物理,化学和生物条件.
- 了解这些对微生物群落和细菌碳生产 (BCP) 的影响,对于河流生态系统的能量转移至关重要.
研究的目的:
- 为了调查支流流入如何影响细菌社区组成和BCP在规范的河流系统.
- 确定细菌群落和BCP变化的关键驱动因素.
主要方法:
- 在澳大利亚穆雷-达林盆地的拉克兰河自然流动事件中采样.
- 对细菌社区组成和BCP的分析,以应对增加的支流流入.
- 统计分析以确定社区和BCP变化的驱动因素.
主要成果:
- 增加的支流流入导致主干河流中的细菌群体显著不同,更加多样化.
- 使用湿性物质的细菌群体增加,而代谢藻类排泄物的细菌群体减少.
- 酸盐和河流排放解释了31%的细菌社区变化.
- 最初BCP降低了,但随着流量增加,细菌的总碳同化增加了20倍.
- BCP是由溶解的有机碳,水温和导电性驱动的,而不是细菌的多样性.
结论:
- 附带流入改变了主要细菌群体的结构和功能,有利于利用陆地溶解有机物质.
- 这导致河流碳同化在短时间内发生重大变化.
- 细菌的碳同化与流量量和资源可用性密切相关,独立于社区的多样性.
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