陆海连接的季节性和局部过程控制了高北极潮平原的沉积物细菌群体结构和功能
Eleanor R Handler1,2,3, Sebastian D J Andersen1,2,3, Rolf Gradinger1
1Department of Arctic and Marine Biology, UiT - The Arctic University of Norway, Framstredet 39, 9019 Tromsø, Norway.
FEMS microbiology ecology
|December 19, 2023
概括
北极的潮平面对于碳循环至关重要. 盐度控制了细菌群落和有机物质的使用,特别是在气候变化增加的淡水涌入的情况下.
科学领域:
- 环境微生物学环境微生物学
- 沿海生物地质化学
- 北极的生态系统动态.
背景情况:
- 北极河口的潮平面是经历重大环境变化的重要过渡区.
- 这些区域对生物地球化学循环至关重要,在很大程度上受到微生物活动的影响.
- 气候变化影响北极降水,冰层融化和陆海相互作用,影响这些研究不足的生态系统.
研究的目的:
- 研究北极河口潮平面中的细菌群体的空间和时间动态.
- 了解这些微生物群落在利用各种有机物质基质中的功能潜力.
- 评估环境因素,特别是盐度对细菌组成和功能的影响.
主要方法:
- 从5月到9月,沿着河流 - 潮间 - 潮下 - 峡湾梯度采样地表沉积物.
- 使用16S rRNA基因metabarcoding进行细菌社区组成分析.
- 在体外碳源利用测试以确定微生物的功能潜力.
主要成果:
- 细菌群体表现出显著的空间和时间变化,与环境梯度有很强的相关性.
- 盐度被确定为构建细菌群落的主导因素.
- 与海洋条件相比,沉积物细菌在淡水和水条件下表现出更广泛的有机物质利用.
- 在整个河口系统中检测到陆地和河流细菌种群.
结论:
- 盐度是动态北极潮平原生态系统过程的关键驱动因素.
- 微生物对陆地有机物的利用在淡水影响的潮平原地区是最高的.
- 潮间平地是北极沿海碳循环的关键组成部分,特别是由于气候变化导致河流排放的增加.
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