title: Effects of temperature and nutrients on changes in genetic diversity of bacterioplankton communities in a semi-closed bay, South Korea.
abstract: Bacterioplankton communities in a semi-closed bay (Jangmok Bay, South Korea) were analysed using a 16S rDNA multiplex 454 pyrosequencing approach. Diversity and operational taxonomic units of bacterioplankton communities in the Jangmok Bay are highest in cold water seasons and lowest in warm water ones. During cold seasons, α-proteobacteria respond rapidly to pulses of the concentration of inorganic nutrients, while γ-proteobacteria during warm water seasons are the most active type of bacterioplankton resent in the prevailing conditions, which include high dissolved organic carbon, chemical oxygen demand and primary production. Cyanobacteria, a minor group constituting 4.58% of the total bacterioplankton, are more abundant at low temperature. Flavobacteria are more abundant in nutrient-rich conditions and the abundance of this group also demonstrated a delayed decline following summer phytoplankton blooms. The pronounced seasonal oscillations in phosphorus concentration and temperature exert strong selection pressure on bacterioplankton communities.
authors.affiliation: Library of Marine Samples, Korea Institute of Ocean Science & Technology, Geoje, 656-834, Republic of Korea.
authors.forename: Hyun Jung
authors.initials: HJ
authors.lastname: Kim
authors.affiliation: Library of Marine Samples, Korea Institute of Ocean Science & Technology, Geoje, 656-834, Republic of Korea. Electronic address: diatoms@kiost.ac.kr.
authors.forename: Seung Won
authors.initials: SW
authors.lastname: Jung
authors.affiliation: Library of Marine Samples, Korea Institute of Ocean Science & Technology, Geoje, 656-834, Republic of Korea.
authors.forename: Dhong-Il
authors.initials: DI
authors.lastname: Lim
authors.affiliation: Ballast Water Center, Korea Institute of Ocean Science & Technology, Geoje, 656-834, Republic of Korea.
authors.forename: Min-Chul
authors.initials: MC
authors.lastname: Jang
authors.affiliation: South Sea Research Center, Korea Institute of Ocean Science & Technology, Geoje, 656-834, Republic of Korea.
authors.forename: Taek-Kyun
authors.initials: TK
authors.lastname: Lee
authors.affiliation: Ballast Water Center, Korea Institute of Ocean Science & Technology, Geoje, 656-834, Republic of Korea.
authors.forename: Kyoungsoon
authors.initials: K
authors.lastname: Shin
authors.affiliation: Department of Life Science, Sangmyung University, Seoul 110-743, Republic of Korea. Electronic address: kijs@smu.ac.kr.
authors.forename: Jang-Seu
authors.initials: JS
authors.lastname: Ki
mesh_terms: D001419:Bacteria / Q000145:classification* / Q000235:genetics; D061006:Bays; D000458:Cyanobacteria; D004784:Environmental Monitoring; D020563:Gammaproteobacteria; D014644:Genetic Variation; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D010839:Phytoplankton / Q000145:classification* / Q000235:genetics; D056910:Republic of Korea; D012621:Seasons; D013696:Temperature
chemical_list: D010758:Phosphorus; D009584:Nitrogen
keywords: 16s rDNA; 454 pyrosequencing; Bacterioplankton diversity; Environmental change; Semi-closed bay