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浮游生物微生物组合对城市亚热带河口干扰的反应

Penelope A Ajani¹, Henna Savela², Tim Kahlke³

¹University of Technology Sydney, School of Life Sciences, 15 Broadway, Ultimo NSW 2007, Australia; Sydney Institute of Marine Sciences, Mosman, New South Wales 2088, Australia.

|July 28, 2023

概括

城市降雨事件显著改变河口的微生物群落,特别是在受到严重影响的地区. 这些变化比季节性变化更为明显,凸显了城市河口生态系统对干扰的脆弱性.

科学领域:

河口生态学河口生态学
微生物生态学微生物生态学
环境微生物学环境微生物学

背景情况:

靠近城市中心的河口面临着来自人类活动和气候变化的日益增加的压力因素.
微生物群落是河口过程的敏感指标,并迅速应对干扰.
城市河口提供了越来越多的人口需求的基本生态系统服务.

研究的目的:

为了确定浮游生物微生物组合对城市河口季节性和降雨干扰的反应.
为了比较不同城市化历史和特征的地点的微生物群落.
研究人类因素对微生物社区结构和功能的影响.

主要方法:

采用了一种多学科的方法,结合了分子条形码 (16S,18S V4 rRNA) 和显微镜.
分析了142个样本,以确定细菌和微生物真核生物zOTUs (独特的操作分类单位).
采用经过验证的水力动力学模型来评估盐度变化对降雨事件的反应.

主要成果:

这个高度城市化的地点显示出更平衡的细菌和真核生物群落,以及降雨后溶解无机的增加.
发生了特定的微生物种群转变,包括减少了Actinomarina和Synechococcus的丰富性,增加了Dinophyceae,Mediophyceae和Bathyoccocaceae.
一场降雨事件导致了与缓冲地点相比,受影响地点的微生物组合发生了更大的转变,在城市化地点观察到显著的盐度减少.

结论:

短暂的降雨事件可以比季节性变化更显著地改变人类影响的城市河口中的微生物组合.
微生物社区的反应在城市和缓冲河口地区之间有所不同,受人类影响和水文学的影响.
对微生物社区对气候相关干扰的反应进行进一步的研究对于维持河口生态系统服务至关重要.

关键词:

生物多样性生物多样性微生物微生物分子条形码的分子编码.植物浮游生物是植物浮游生物.悉尼的港口悉尼的港口过渡性压力是一种过渡性压力.

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