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变暖导致波罗的海沿海沉积物微生物丰富度的下降
Laura Seidel1, Songjun Li1, Shahinez Hanna-Elias1
1Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden.
Environmental microbiology
|February 19, 2026
概括
海洋变暖意外地减少了沉积物微生物细胞的丰富性,影响了海洋食物网的基础. 活细胞/死细胞的比率保持稳定,这表明热应激,而不是细胞死亡是主要影响.
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
- 气候变化科学 气候变化科学
背景情况:
- 长期的海洋变暖对海洋生态系统产生重大影响,影响生物地球化学循环和微生物群落.
- 沉积物微生物细胞的丰富性和活力对持续变暖的反应仍然不太清楚.
- 了解这些反应对于预测未来气候变化对海洋环境的影响至关重要.
研究的目的:
- 调查长期人工海洋变暖对沉积物微生物细胞丰度和活/死比的影响.
- 为了将持续加热的海湾中的微生物群落与附近的控制海湾进行比较.
- 评估气候变暖引起的微生物群落变化对海洋生态系统运行的影响.
主要方法:
- 从一个波罗的海湾收集沉积物核心样本,该湾经过50多年的人工加热 (平均升温5°C) 和一个对照湾.
- 定量PCR (qPCR) 用于确定沉积物的微生物细胞丰度.
- 活细胞与死细胞比率的分析.
- 沿沉积物深度梯度进行16S rRNA基因测序.
主要成果:
- 与预期相反,qPCR揭示了与深度梯度沿线的控制海湾相比,加热海湾的沉积物细胞丰度下降.
- 活细胞/死细胞的比率没有显示出海湾之间的显著差异,表明大多数细胞仍然是可行的.
- 16S rRNA基因测序证实,长时间的变暖会使生物地化学区域变浅,并改变相关的微生物群落.
结论:
- 持续的海洋变暖可能会导致沉积物微生物细胞丰度的减少,可能是通过将代谢能量转移到应激反应.
- 这些发现表明,由于变暖而导致的微生物生物质减少可能会影响海洋食物网的基础.
- 未来与气候变化相关的海洋变暖可能对海洋生态系统的结构和功能产生重大,级联的影响.
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