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Area of Science:

  • Marine microbial ecology
  • Biogeochemistry
  • Oceanography

Background:

  • Marine dissolved organic carbon (DOC) is a vast carbon reservoir, with a significant portion being recalcitrant (RDOC) and contributing to long-term ocean carbon sequestration.
  • The origin of RDOC remains largely unclear, hindering a full understanding of the ocean's role in the global carbon cycle.
  • The microbial carbon pump (MCP) framework proposes that microbes transform labile organic matter into RDOC, influencing carbon sequestration.

Purpose of the Study:

  • To explore the microbial processing of DOC at genetic and ecosystem levels within the context of the MCP.
  • To investigate the distinct DOC utilization patterns of major marine bacterial clades, Roseobacter and SAR11.
  • To assess the contribution of bacterially derived RDOC to the total marine RDOC pool.

Main Methods:

  • Analysis of ATP binding cassette (ABC) transporter genes in Roseobacter and SAR11 to infer DOC uptake capabilities.
  • Examination of d-amino acid biomarkers to estimate the contribution of bacterial production to the RDOC pool.
  • Review of existing literature on the MCP and its implications for ocean carbon sequestration.

Main Results:

  • Distinct DOC utilization strategies were identified: Roseobacter strains show a preference for carbohydrate DOC, while SAR11 bacteria favor nitrogen-containing DOC.
  • Bacterially derived RDOC, indicated by d-amino acid biomarkers, accounts for approximately 25% of the total marine RDOC pool.
  • The MCP plays a significant role in generating RDOC, contributing to long-term carbon sequestration in the ocean.

Conclusions:

  • Microbial processing, particularly through mechanisms like ABC transporters, is key to generating RDOC and driving the MCP.
  • Understanding the differential DOC utilization by key marine bacteria is essential for predicting carbon cycling dynamics.
  • The MCP's role in ocean carbon sequestration may be amplified under future global warming scenarios, necessitating interdisciplinary research on ocean carbon cycling and global change.