海洋脱氧导致地生态系统的结构和功能产生非线性反应
Ludovic Pascal1, Joannie Cool1, Philippe Archambault2
1Québec Océan, Institut des Sciences de la mer de Rimouski, Université du Québec à Rimouski, Rimouski, Quebec, Canada.
Global change biology
|November 2, 2023
概括
海洋脱氧影响海洋生物和沉积物过程. 在63μM的氧气值以下,谷底层社区发生变化,减少生物流和改变沉积物表面附近的有机物代谢.
科学领域:
- 海洋生态海洋生态学
- 生物地质化学生物地质化学
- 海洋学 海洋学 海洋学
背景情况:
- 海洋脱氧是一个日益严重的全球问题,由气候变化和人类活动驱动.
- 氧气减少对盆地社区和沉积物生物地球化学的长期影响尚未完全理解.
- 地生态系统在海洋碳和营养循环中发挥着至关重要的作用.
研究的目的:
- 为了研究脱氧对盆地聚合物和生物地化学功能的影响.
- 确定影响海洋生态系统的关键氧气值.
- 了解在低氧条件下盆地社区和沉积物过程之间的反.
主要方法:
- 研究了圣劳伦斯河口和海湾的自然溶解氧梯度.
- 分析了宏观本地社区结构和生物多样性.
- 评估了沉积物的生物地质化学和生物化率.
主要成果:
- 观察到生物多样性和生态系统功能对氧气水平下降的非线性反应.
- 确定了大约63微米的临界氧值.
- 记录了生物流在这个门以下的急剧减少,导致有机物代谢发生变化.
结论:
- 生物化物种在减轻缺氧的生物地化学后果方面发挥着关键作用.
- 脱氧显著改变了谷底社区的结构和功能.
- 这些发现有助于预测海底生态系统在持续的海洋变暖和脱氧下未来的变化.
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