Important contribution of macroalgae to oceanic carbon sequestration
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....
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ftuniaarhuspubl:oai:pure.atira.dk:publications/cf0ac8cf-7abc-4542-9e8b-fddb1372a452 2023-05-15T18:21:07+02:00 Important contribution of macroalgae to oceanic carbon sequestration Ortega, Alejandra Geraldi, Nathan R. Alam, Intikhab Kamau, Allan A. Acinas, Silvia G. Logares, Ramiro Gasol, Josep M. Massana, Ramon Krause-Jensen, Dorte Duarte, Carlos M. 2019 https://pure.au.dk/portal/da/publications/important-contribution-of-macroalgae-to-oceanic-carbon-sequestration(cf0ac8cf-7abc-4542-9e8b-fddb1372a452).html https://doi.org/10.1038/s41561-019-0421-8 http://www.scopus.com/inward/record.url?scp=85070292305&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Ortega , A , Geraldi , N R , Alam , I , Kamau , A A , Acinas , S G , Logares , R , Gasol , J M , Massana , R , Krause-Jensen , D & Duarte , C M 2019 , ' Important contribution of macroalgae to oceanic carbon sequestration ' , Nature Geoscience , vol. 12 , no. 9 , pp. 748-754 . https://doi.org/10.1038/s41561-019-0421-8 article 2019 ftuniaarhuspubl https://doi.org/10.1038/s41561-019-0421-8 2022-11-23T23:55:54Z 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. Article in Journal/Newspaper South Atlantic Ocean Aarhus University: Research Nature Geoscience 12 9 748 754 |
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Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Ortega, Alejandra Geraldi, Nathan R. Alam, Intikhab Kamau, Allan A. Acinas, Silvia G. Logares, Ramiro Gasol, Josep M. Massana, Ramon Krause-Jensen, Dorte Duarte, Carlos M. |
spellingShingle |
Ortega, Alejandra Geraldi, Nathan R. Alam, Intikhab Kamau, Allan A. Acinas, Silvia G. Logares, Ramiro Gasol, Josep M. Massana, Ramon Krause-Jensen, Dorte Duarte, Carlos M. Important contribution of macroalgae to oceanic carbon sequestration |
author_facet |
Ortega, Alejandra Geraldi, Nathan R. Alam, Intikhab Kamau, Allan A. Acinas, Silvia G. Logares, Ramiro Gasol, Josep M. Massana, Ramon Krause-Jensen, Dorte Duarte, Carlos M. |
author_sort |
Ortega, Alejandra |
title |
Important contribution of macroalgae to oceanic carbon sequestration |
title_short |
Important contribution of macroalgae to oceanic carbon sequestration |
title_full |
Important contribution of macroalgae to oceanic carbon sequestration |
title_fullStr |
Important contribution of macroalgae to oceanic carbon sequestration |
title_full_unstemmed |
Important contribution of macroalgae to oceanic carbon sequestration |
title_sort |
important contribution of macroalgae to oceanic carbon sequestration |
publishDate |
2019 |
url |
https://pure.au.dk/portal/da/publications/important-contribution-of-macroalgae-to-oceanic-carbon-sequestration(cf0ac8cf-7abc-4542-9e8b-fddb1372a452).html https://doi.org/10.1038/s41561-019-0421-8 http://www.scopus.com/inward/record.url?scp=85070292305&partnerID=8YFLogxK |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Ortega , A , Geraldi , N R , Alam , I , Kamau , A A , Acinas , S G , Logares , R , Gasol , J M , Massana , R , Krause-Jensen , D & Duarte , C M 2019 , ' Important contribution of macroalgae to oceanic carbon sequestration ' , Nature Geoscience , vol. 12 , no. 9 , pp. 748-754 . https://doi.org/10.1038/s41561-019-0421-8 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1038/s41561-019-0421-8 |
container_title |
Nature Geoscience |
container_volume |
12 |
container_issue |
9 |
container_start_page |
748 |
op_container_end_page |
754 |
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1766200226768486400 |