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Seasonal Mixing-Driven System in Estuarine–Coastal Zone Triggers an Ecological Shift in Bacterial Assemblages Involved in Phytoplankton-Derived DMSP Degradation

  • Microbiology of Aquatic Systems
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Abstract

The coastal zone has distinguishable but tightly connected ecosystems from rivers to the ocean and globally contributes to nutrient cycling including phytoplankton-derived organic matter. Particularly, bacterial contributions to phytoplankton-derived dimethylsulfoniopropionate (DMSP) degradation have been recently evaluated by using advanced sequencing technologies to understand their role in the marine microbial food web. Here, we surveyed the bacterial diversity and community composition under seasonal water mixing in the bay of Gwangyang (GW), a semi-enclosed estuary at the southern tip of the Korea Peninsula. We detected phylogenetic dissimilarities among season-specific habitats in GW and their specific bacterial taxa. Additionally, bacterial contribution to degradation of phytoplankton-derived DMSP from estuarine to coastal waters at euphotic depths in GW was investigated as the presence or absence of DMSP demethylation gene, encoded by dmdA. Among the operational taxonomic units (OTUs) in GW bacterial communities, the most dominant and ubiquitous OTU1 was affiliated with the SAR11 clade (SAR11-OTU). The population dynamics of SAR11-OTU in dmdA-detected GW waters suggest that water mass mixing plays a major role in shaping bacterial communities involved in phytoplankton-derived DMSP demethylation.

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Funding

This study was supported by the project titled “Long-term Marine Ecosystem Research,” funded by the Ministry of Oceans and Fisheries, Korea, and the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2016R1A6A3A11931896).

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Authors and Affiliations

  1. Jeju National University, Jeju, Jeju Special Self-Governing Province, 63243, Republic of Korea

    Dukki Han & Tatsuya Unno

  2. School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea

    Hee Yoon Kang, Chang-Keun Kang & Hor-Gil Hur

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  1. Dukki Han
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  5. Hor-Gil Hur
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Correspondence to Hor-Gil Hur.

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Han, D., Kang, H.Y., Kang, CK. et al. Seasonal Mixing-Driven System in Estuarine–Coastal Zone Triggers an Ecological Shift in Bacterial Assemblages Involved in Phytoplankton-Derived DMSP Degradation. Microb Ecol 79, 12–20 (2020). https://doi.org/10.1007/s00248-019-01392-w

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