Marine Bacterioplankton Community Dynamics and Potentially Pathogenic Bacteria in Seawater around Jeju Island, South Korea, via Metabarcoding

Author:

Kim Hyun-Jung12,Kim Kang Eun13,Kim Yu Jin13,Kang Hangoo4,Shin Ji Woo1,Kim Soohyun1,Lee Sang Heon2ORCID,Jung Seung Won13ORCID,Lee Taek-Kyun35ORCID

Affiliation:

1. Library of Marine Samples, Korea Institute of Ocean Science & Technology, Geoje 53201, Republic of Korea

2. Department of Oceanography and Marine Research Institute, Pusan National University, Busan 46241, Republic of Korea

3. Department of Ocean Science, University of Science & Technology, Daejeon 34113, Republic of Korea

4. Vessel Operation & Observation Team, Korea Institute of Ocean Science & Technology, Geoje 53201, Republic of Korea

5. Ecological Risk Research Department, Korea Institute of Ocean Science & Technology, Geoje 53201, Republic of Korea

Abstract

Understanding marine bacterioplankton composition and distribution is necessary for improving predictions of ecosystem responses to environmental change. Here, we used 16S rRNA metabarcoding to investigate marine bacterioplankton diversity and identify potential pathogenic bacteria in seawater samples collected in March, May, September, and December 2013 from two sites near Jeju Island, South Korea. We identified 1343 operational taxonomic units (OTUs) and observed that community diversity varied between months. Alpha- and Gamma-proteobacteria were the most abundant classes, and in all months, the predominant genera were Candidatus Pelagibacter, Leisingera, and Citromicrobium. The highest number of OTUs was observed in September, and Vibrio (7.80%), Pseudoalteromonas (6.53%), and Citromicrobium (6.16%) showed higher relative abundances or were detected only in this month. Water temperature and salinity significantly affected bacterial distribution, and these conditions, characteristic of September, were adverse for Aestuariibacter but favored Citromicrobium. Potentially pathogenic bacteria, among which Vibrio (28 OTUs) and Pseudoalteromonas (six OTUs) were the most abundant in September, were detected in 49 OTUs, and their abundances were significantly correlated with water temperature, increasing rapidly in September, the warmest month. These findings suggest that monthly temperature and salinity variations affect marine bacterioplankton diversity and potential pathogen abundance.

Funder

National Research Foundation of South Korea

Korea Institute of Marine Science and Technology Promotion

Publisher

MDPI AG

Subject

Inorganic Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Computer Science Applications,Spectroscopy,Molecular Biology,General Medicine,Catalysis

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