Biogeosciences
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Articles | Volume 22, issue 20
Articles | Volume 22, issue 20
https://doi.org/10.5194/bg-22-5787-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-5787-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 20
Research article
 | 
21 Oct 2025
Research article |  | 21 Oct 2025

Carbohydrates, enzyme activities, and microbial communities across depth gradients in the western North Atlantic Ocean

C. Chad Lloyd, Sarah Brown, Greta Giljan, Sherif Ghobrial, Silvia Vidal-Melgosa, Nicola Steinke, Jan-Hendrik Hehemann, Rudolf Amann, and Carol Arnosti

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Latest update: 22 Jun 2026
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Short summary
Carbon cycling throughout the ocean is dependent on the balance between phytoplankton productivity and heterotrophic decomposition. Bacteria must produce structurally specific enzymes to degrade specific chemical structures found in organic matter. Organic matter composition, environmental physical/chemical parameters, microbial community composition, and enzymatic activities varied with depth; the structural complexity of organic matter varied also with location in the ocean.
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