珊瑚的高分子量碳水化合物支持藻类主导的珊瑚礁中的细菌浮游生物中的机会主义微生物
Bianca M Thobor1, Andreas F Haas2, Christian Wild1
1Department of Marine Ecology, University of Bremen, Bremen, Germany.
mSystems
|October 22, 2024
概括
珊瑚排泄物含有丰富的特定碳水化合物,通过促进细菌浮游生物的新陈代谢和选择机会性微生物来为珊瑚礁的食物网提供燃料. 然而,藻类排泄物可能会增加微生物呼吸,导致珊瑚礁微生物化. 这凸显了溶解有机物组成的变化如何推动海洋生态系统中的微生物转变.
科学领域:
- 海洋微生物生态学
- 珊瑚礁生态系统珊瑚礁生态系统
- 溶解有机物生物地质化学
背景情况:
- 基原始生产者释放高分子量 (HMW) 碳水化合物,这是溶解有机物 (DOM) 的关键组成部分.
- 由于压力因素,珊瑚礁正在从珊瑚转向藻类主导,改变DOM组成,并可能促进机会主义微生物.
- 了解不同的DOM来源如何影响细菌浮游生物群落对于珊瑚礁健康至关重要.
研究的目的:
- 为了比较HMW碳水化合物从珊瑚和大藻的单糖化合物组成.
- 调查珊瑚和宏藻衍生的HMW碳水化合物对藻类占主导地位的珊瑚礁中的细菌浮游生物群落的影响.
- 为了确定DOM组成或类型是否驱动机会微生物的选择.
主要方法:
- 从硬珊瑚和棕色藻中收集和分析HMW碳水化合物分量.
- 评估了排泄物的单糖组成,并将其与环境珊瑚礁水进行了比较.
- 来自藻类主导的珊瑚礁的化细菌浮游生物与珊瑚和藻类 HMW DOM 分数.
- 通过测序和生物信息学分析了细菌浮游生物群体的组成,并预测了代谢功能.
主要成果:
- 富含阿拉比诺斯的HMW珊瑚排泄物与藻类排泄物和珊瑚礁水 (富含福科斯) 不同.
- 珊瑚排泄物显著增加了预测的细菌浮游生物能量 (28%),氨基酸 (44%) 和碳水化合物 (111%) 代谢.
- 珊瑚排泄物被选择为机会性种群 (例如,Rhodobacteraceae,Vibrionaceae),而藻类排泄物没有显著改变细菌浮游生物群或新陈代谢.
结论:
- 高密度珊瑚排泄物通过支持细菌浮游生物的生长和新陈代谢,有效地将能量转移到更高的食量水平.
- 藻类排泄物可能会刺激微生物呼吸,而不是生物质生产,这可能会导致珊瑚礁微生物化.
- DOM组成的转变,而不是DOM源本身 (珊瑚与藻类),似乎推动了在不断变化的珊瑚礁环境中机会主义微生物的兴起.
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