Degradation pathways for organic matter of terrestrial origin are widespread and expressed in Arctic Ocean microbiomes ...

• Main Authors: Grevesse, Thomas, Guéguen, Céline, Onana, Vera E., Walsh, David A.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: figshare 2023
• Subjects: Microbiology; FOS Biological sciences; Oceanography; FOS Earth and related environmental sciences; Arctic; Arctic Ocean; Canada; canada basin; Global warming; permafrost
• Online Access: https://dx.doi.org/10.6084/m9.figshare.c.6588385.v1; https://springernature.figshare.com/collections/Degradation_pathways_for_organic_matter_of_terrestrial_origin_are_widespread_and_expressed_in_Arctic_Ocean_microbiomes/6588385/1

Abstract Background The Arctic Ocean receives massive freshwater input and a correspondingly large amount of humic-rich organic matter of terrestrial origin. Global warming, permafrost melt, and a changing hydrological cycle will contribute to an intensification of terrestrial organic matter release to the Arctic Ocean. Although considered recalcitrant to degradation due to complex aromatic structures, humic substances can serve as substrate for microbial growth in terrestrial environments. However, the capacity of marine microbiomes to process aromatic-rich humic substances, and how this processing may contribute to carbon and nutrient cycling in a changing Arctic Ocean, is relatively unexplored. Here, we used a combination of metagenomics and metatranscriptomics to assess the prevalence and diversity of metabolic pathways and bacterial taxa involved in aromatic compound degradation in the salinity-stratified summer waters of the Canada Basin in the western Arctic Ocean. Results Community-scale meta-omics ...