A multiproxy approach to characterize the sedimentation of organic carbon in the Amazon continental shelf

Sobrinho, Rodrigo de Lima; Bernardes, Marcelo; Rezende, Carlos Eduardo de; Kim, Jung-Hyun; Schouten, Stefan; Damsté, Jaap S. Sinninghe

doi:10.1016/j.marchem.2021.103961

Cited by 12 publications

(8 citation statements)

References 82 publications

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“…As previously mentioned, stable isotopes or carbon and nitrogen have been broadly utilized, but their use as single tracers should be carefully applied, for example, in Arctic systems, where the high inorganic nitrogen may lead to an underestimation of ter‐OM if not properly removed (Kumar et al, 2016). Thus, apart from habitat‐specific approaches, the use of multi and complementary ter‐OM tracers is needed for more reliable estimations, such as using radiocarbon (Feng et al, 2013; Guo et al, 2004) and lignin phenols (Rezende et al, 2010; Sobrinho et al, 2021), and a strong need to focus on the integrative use of land‐derived tracers, especially in environmental monitoring programs.…”

Section: Current Status Of the Research Topic: Ter‐om And Macrofauna ...mentioning

confidence: 99%

The interplay between terrestrial organic matter and benthic macrofauna: Framework, synthesis, and perspectives

et al. 2023

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Ecosystems are shaped by physical, chemical, and biological drivers, which affect the quality and quantity of basal energy sources, with impacts that cascade to higher trophic levels. In coastal, shelf, and marine habitats, terrestrial‐derived organic matter (ter‐OM) can be a key driver of ecosystem structure and function. Climate change is expected to alter land–ocean connectivity in many regions, with a broad range of potential consequences for impacted ecosystems, particularly in the coastal zone. The benthic compartment is an important link between the large organic carbon pools stored on land and the marine environment. At the same time, the macrofauna plays a key role in the processing, biological uptake, and fate of ter‐OM in the aquatic environment, with implications for coastal ecosystem functioning, benthic–pelagic coupling, carbon burial, and biogeochemical cycles. However, information about relationships between land–ocean connectivity (including ter‐OM loads) and coastal benthic community responses remains spread across disciplines, and a broad perspective on the potential impacts of a changing climate is still missing. Here, we explore the interplay between benthic macrofaunal communities and ter‐OM through a paired narrative and research weaving analysis, which combines systematic mapping and bibliometric analysis. The review describes the past development and status of the research field as well as the lack of information in some geographical regions and habitats worldwide. We highlight the role of macrofauna in carbon cycling and the growing evidence that ter‐OM plays a key role in the structure and function of benthic communities, not strictly limited to estuarine habitats. Climate change poses challenges for the prediction of future ter‐OM fluxes and potential macrofauna responses to this additional stressor, thus requiring new methodological approaches (e.g., multimarker approaches for OM characterization) and long‐term monitoring programs across different habitats and spatiotemporal scales.

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Section: Current Status Of the Research Topic: Ter‐om And Macrofauna ...mentioning

confidence: 99%

The interplay between terrestrial organic matter and benthic macrofauna: Framework, synthesis, and perspectives

et al. 2023

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“…Perhaps the largest C sink, yet the most uncertain stock, lies within the Brazilian shelf sediments, which may receive a large part of the C exported from continental, coastal, and in situ pelagic biota inputs (e.g., Amazon River plume) (DeMaster et al, 1996;Sobrinho et al, 2021). Shelf sediments cover ~9% of global marine area and may account for more than 90% of stored carbon within some national inventories (Legge et al, 2020).…”

Section: Continental Shelfmentioning

confidence: 99%

“…Recent studies have estimated that the Amazon River Delta has an accumulated sedimentation rate above the global average. Moreover, the suspended material is transported horizontally by river plume fuel production to adjacent seafloor areas, which improves the relevance of the Amazon continental shelf to the global carbon budget (Sobrinho et al, 2021).…”

Section: Continental Shelfmentioning

confidence: 99%

Blue Carbon Ecosystems in Brazil: Overview and an Urgent Call for Conservation and Restoration

et al. 2022

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In this article, we discuss knowledge and gaps regarding blue carbon ecosystems (BCEs) in Brazil, considering the urgency to apply protection actions and policies to safeguard their biodiversity and associated ecosystem services. We also indicate areas of further research to improve carbon stocks and sequestration rate estimates. We call attention to the shortage of studies on Brazilian BCEs relative to the growing knowledge on the Blue Carbon Framework accumulated worldwide over the last decade. Considering the extensive Brazilian Economic Exclusive Zone (known as “Blue Amazon”), knowledge concerning blue carbon stocks is vital at regional and global scales for mitigating global increases in atmospheric carbon dioxide (CO2). The Blue Amazon has at least 1,100,000 ha of vegetated and non-vegetated coastal ecosystems (mangroves, salt marshes, seagrass meadows, and hypersaline tidal flats) that collectively contain vast amounts of stored carbon, making Brazil an ideal place to test mechanisms for evaluating, conserving, and restoring BCEs. Other poorly understood potential sinks and sources of carbon are macroalgal and rhodolith beds, mudflats, continental shelf sediments, and marine animal forests in shallow, mesophotic, and deep waters. The carbon fluxes between diverse environmental compartments, such as soil–air, soil–water, groundwater–water–surface water, air–water, and land–ocean, in BCEs across the Blue Amazon must be studied. We emphasize the importance of assessing the total carbon stock and the recent dismantling of environmental laws that pose great risks to these important BCEs. The conservation and recovery of these areas would enhance the carbon sequestration capacity of the entire country. Furthermore, we highlight priorities to improve knowledge concerning BCEs and their biogeochemical cycles in the Blue Amazon and to provide information to assist in the reduction of atmospheric levels of CO2 for the United Nations Decade of Ocean Science (2021–2030).

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“…TOC is mainly derived from marine primary production (Aller and Blair, 2006;Sobrinho et al, 2021). Ward et al (2015) reported that about 50 % of continental OM does not reach the Amazon coastal zone due to intense OM river remineralization and sedimentation.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

“…Ward et al (2015) reported that about 50 % of continental OM does not reach the Amazon coastal zone due to intense OM river remineralization and sedimentation. In addition, according to Sobrinho et al (2021), terrestrial OM that reaches the Amazon River delta comprises the main OM sediment source. Organic matter is, however, continuously remineralized in the Amazon River plume and terrestrial OM is replaced by marine OM, which explains the strong 13 C enrichment noted with increasing river mouth distances (Aller and Blair, 2006) (Figures 2B and 3B).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Land-Use Changes in Amazon and Atlantic Rainforests Modify Organic Matter and Black Carbon Compositions Transported from Land to the Coastal Ocean

Serafim¹,

Almeida²,

Thouzeau³

et al. 2022

SSRN Journal

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A multiproxy approach to characterize the sedimentation of organic carbon in the Amazon continental shelf

Cited by 12 publications

References 82 publications

The interplay between terrestrial organic matter and benthic macrofauna: Framework, synthesis, and perspectives

The interplay between terrestrial organic matter and benthic macrofauna: Framework, synthesis, and perspectives

Blue Carbon Ecosystems in Brazil: Overview and an Urgent Call for Conservation and Restoration

Land-Use Changes in Amazon and Atlantic Rainforests Modify Organic Matter and Black Carbon Compositions Transported from Land to the Coastal Ocean

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