ArticleProceedings of the National Academy of Sciences of the United States of America2024
3D intrusions transport active surface microbial assemblages to the dark ocean.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Warm-core eddy intensifies surface mixotrophic bacterivory and fuels mesopelagic heterotrophic grazing.Communications biology · 2026Article
- The three-dimensional structure of fine-scale, vertical velocities in the Southern Ocean inferred from space.Communications earth & environment · 2026Article
- Physical controls on heterogeneous mesopelagic biogeochemistry.Communications earth & environment · 2026Review
- The oceanic physical injection pump of organic carbon.Nature communications · 2025Article
- Macroecological patterns of planktonic unicellular eukaryotes richness in the Southeast Pacific Ocean.Scientific reports · 2025Article
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Authors and funding
15 authors.
Funding
Abstract
Subtropical oceans contribute significantly to global primary production, but the fate of the picophytoplankton that dominate in these low-nutrient regions is poorly understood. Working in the subtropical Mediterranean, we demonstrate that subduction of water at ocean fronts generates 3D intrusions with uncharacteristically high carbon, chlorophyll, and oxygen that extend below the sunlit photic zone into the dark ocean. These contain fresh picophytoplankton assemblages that resemble the photic-zone regions where the water originated. Intrusions propagate depth-dependent seasonal variations in microbial assemblages into the ocean interior. Strikingly, the intrusions included dominant biomass contributions from nonphotosynthetic bacteria and enrichment of enigmatic heterotrophic bacterial lineages. Thus, the intrusions not only deliver material that differs in composition and nutritional character from sinking detrital particles, but also drive shifts in bacterial community composition, organic matter processing, and interactions between surface and deep communities. Modeling efforts paired with global observations demonstrate that subduction can flux similar magnitudes of particulate organic carbon as sinking export, but is not accounted for in current export estimates and carbon cycle models. Intrusions formed by subduction are a particularly important mechanism for enhancing connectivity between surface and upper mesopelagic ecosystems in stratified subtropical ocean environments that are expanding due to the warming climate.
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