在北极表面沉积物中海洋大藻的普遍指纹
Sarah B Ørberg1, Carlos M Duarte2, Nathan R Geraldi3
1Department of Ecoscience, Aarhus University, DK-8000 Aarhus C, Denmark; Arctic Research Centre, Aarhus University, DK-8000 Aarhus C, Denmark.
The Science of the total environment
|July 13, 2023
概括
宏观藻类森林对北极海洋沉积物碳库存做出了重大贡献. 环境DNA (eDNA) 分析显示,在从近岸到近海地区的沉积物中,宏观藻类,特别是棕色藻类的广泛存在.
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
- 分子生态学分子生态学
背景情况:
- 大藻类森林是重要的初级生产者,出口有机物质.
- 它们对海洋沉积物碳库存的贡献尚不清楚.
- 北极海洋生态系统面临着独特的环境压力和碳循环动态.
研究的目的:
- 为了测试宏观藻类对北极海洋沉积物的碳储量作出贡献的假设.
- 通过使用环境DNA (eDNA) 来评估大藻类贡献的流行和分布.
- 为了比较eDNA发现与传统的调查和追踪方法进行验证.
主要方法:
- 从格陵兰岛和斯瓦尔巴德岛的表面沉积物样本的大规模环境DNA (eDNA) 指纹.
- 分析涵盖了广泛的水度范围 (近岸至1460米深) 和离岸距离 (高达350公里).
- 将eDNA数据与传统调查 (大藻,草) 的数据进行比较,并进行稳定同位素分析.
主要成果:
- 在94%的沉积物样本中检测到宏的eDNA,表明广泛存在.
- 在近海地区发现了藻eDNA的最高序列丰富度,以棕色藻为主.
- 电子DNA结果与传统调查和稳定同位素分析相关性很好,证实了宏藻对沉积碳的贡献.
结论:
- 宏观藻类森林,特别是棕藻,是北极海洋沉积物碳库存的主要贡献者.
- 电子DNA分析提供了一种强大而有效的工具,用于记录各种海洋环境中的宏观藻类贡献.
- 调查结果强调了巨藻出口在支持海上食物网和碳捕获方面的关键作用.
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