Disentangling microbial networks across pelagic zones in the tropical and subtropical global ocean

Ina M. Deutschmann (), Erwan Delage, Caterina R. Giner, Marta Sebastián, Julie Poulain, Javier Arístegui, Carlos M. Duarte, Silvia G. Acinas, Ramon Massana, Josep M. Gasol, Damien Eveillard, Samuel Chaffron and Ramiro Logares ()
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Ina M. Deutschmann: Institute of Marine Sciences (ICM), CSIC
Erwan Delage: Nantes Université, CNRS UMR 6004, LS2N
Caterina R. Giner: Institute of Marine Sciences (ICM), CSIC
Marta Sebastián: Institute of Marine Sciences (ICM), CSIC
Julie Poulain: Université Paris-Saclay
Javier Arístegui: Universidad de Las Palmas de Gran Canaria, ULPGC
Carlos M. Duarte: King Abdullah University of Science and Technology (KAUST), Red Sea Research Center (RSRC)
Silvia G. Acinas: Institute of Marine Sciences (ICM), CSIC
Ramon Massana: Institute of Marine Sciences (ICM), CSIC
Josep M. Gasol: Institute of Marine Sciences (ICM), CSIC
Damien Eveillard: Nantes Université, CNRS UMR 6004, LS2N
Samuel Chaffron: Nantes Université, CNRS UMR 6004, LS2N
Ramiro Logares: Institute of Marine Sciences (ICM), CSIC

Nature Communications, 2024, vol. 15, issue 1, 1-17

Abstract: Abstract Microbial interactions are vital in maintaining ocean ecosystem function, yet their dynamic nature and complexity remain largely unexplored. Here, we use association networks to investigate possible ecological interactions in the marine microbiome among archaea, bacteria, and picoeukaryotes throughout different depths and geographical regions of the tropical and subtropical global ocean. Our findings reveal that potential microbial interactions change with depth and geographical scale, exhibiting highly heterogeneous distributions. A few potential interactions were global, meaning they occurred across regions at the same depth, while 11-36% were regional within specific depths. The bathypelagic zone had the lowest proportion of global associations, and regional associations increased with depth. Moreover, we observed that most surface water associations do not persist in deeper ocean layers despite microbial vertical dispersal. Our work contributes to a deeper understanding of the tropical and subtropical global ocean interactome, which is essential for addressing the challenges posed by global change.

Date: 2024
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DOI: 10.1038/s41467-023-44550-y

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