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Important contribution of macroalgae to oceanic carbon sequestration
Nature Geoscience ( IF 15.7 ) Pub Date : 2019-08-05 , DOI: 10.1038/s41561-019-0421-8
Alejandra Ortega , Nathan R. Geraldi , Intikhab Alam , Allan A. Kamau , Silvia G. Acinas , Ramiro Logares , Josep M. Gasol , Ramon Massana , Dorte Krause-Jensen , Carlos M. Duarte

The role of macroalgae in Blue Carbon assessments has been controversial, partially due to uncertainties about the fate of exported macroalgae. Available evidence suggests that macroalgae are exported to reach the open ocean and the deep sea. Nevertheless, this evidence lacks systematic assessment. Here, we provide robust evidence of macroalgal export beyond coastal habitats. We used metagenomes and metabarcodes from the global expeditions Tara Oceans and Malaspina 2010 Circumnavigation. We discovered macroalgae worldwide at up to 5,000 km from coastal areas. We found 24 orders, most of which belong to the phylum Rhodophyta. The diversity of macroalgae was similar across oceanic regions, although the assemblage composition differed. The South Atlantic Ocean presented the highest macroalgal diversity, whereas the Red Sea was the least diverse region. The abundance of macroalgae sequences attenuated exponentially with depth at a rate of 37.3% km−1, and only 24% of macroalgae available at the surface were expected to reach the seafloor at a depth of 4,000 m. Our findings indicate that macroalgae are exported across the open and the deep ocean, suggesting that macroalgae may be an important source of allochthonous carbon, and their contribution should be considered in Blue Carbon assessments.



中文翻译:

大型藻类对海洋碳固存的重要贡献

大型藻类在蓝色碳评估中的作用一直存在争议,部分原因是出口大型藻类的命运不确定。现有证据表明,大型藻类的出口可到达公海和深海。但是,该证据缺乏系统的评估。在这里,我们提供了超出沿海栖息地的大型藻类出口的有力证据。我们使用了来自全球探险队Tara Oceans和Malaspina 2010 Circumnavigation的元基因组和元条形码。我们在距沿海地区多达5,000公里的地方发现了大型藻类。我们找到了24个订单,其中大多数属于Rhodophyta门。大洋藻的多样性在大洋地区是相似的,尽管它们的组成不同。南大西洋的大型藻类多样性最高,而红海是最不多样化的地区。大型藻类序列的丰富度随深度呈指数衰减,速率为37.3%km-1,并且预计只有24%的大型藻类能到达4,000 m深度的海底。我们的发现表明,大型藻类出口到整个开放和深海中,这表明大型藻类可能是异源碳的重要来源,因此在“蓝色碳”评估中应考虑它们的贡献。

更新日期:2019-08-05
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