来自海藻的溶解有机物 (DOM) 的生物可用性 Gracilaria lemaneiformis被微生物吸收
Xiao-Li Ou1, Lin-Jian Ou1, Yu-Feng Yang1
1College of Life Science and Technology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Jinan University, Guangzhou 510632, China.
Marine pollution bulletin
|November 10, 2024
概括
海藻 (Gracilaria lemaneiformis) 溶解的有机物具有很高的生物可用性,迅速为微生物群体提供燃料,并改变沿海水域的细菌群体. 这凸显了它在海洋碳循环中的重要作用.
科学领域:
- 海洋生物学 海洋生物学
- 微生物生态学 微生物生态学
- 生物地质化学生物地质化学
背景情况:
- 作为一个主要的海洋生产者,Gracilaria lemaneiformis释放出大量的溶解有机物 (DOM).
- 这种DOM可以影响沿海的碳储存和微生物动态.
- 了解DOM生物可用性对于沿海生态系统研究至关重要.
研究的目的:
- 为了评估来自Gracilaria的DOM的生物可用性.
- 研究其对微生物社区结构和功能的影响.
- 探索DOM,微生物和细胞外酶之间的关系.
主要方法:
- 实验室实验模拟DOM流入自然海水中的实验.
- 在168小时内监测DOM组成,微生物群落结构和细胞外酶活动.
- 分析DOM成分,微生物丰富度和酶活性之间的相关性.
主要成果:
- 在168小时内消耗了48-90%的碳,和. Gracilaria DOM显示出高生物可用性.
- 托芬物质是微生物使用的主要,不稳定的DOM组件.
- 细菌群落发生了转变,最初是Proteobacteria主导,其次是Desulfobacterota,因为DOM分解了.
- 细胞外酶活动很早达到峰值,与不稳定的DOM和细菌丰富度正相关.
结论:
- 来自Gracilaria的DOM易于生物利用,并对沿海微生物群落产生重大影响.
- 像托这样的不稳定成分驱动快速的微生物反应和酶生产.
- 这些发现凸显了海藻衍生的DOM在近岸碳循环和微生物生态学中的关键作用.
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