Bacterial communities of surface mixed layer in the Pacific sector of the western Arctic Ocean during sea-ice melting.
From July to August 2010, the IBRV ARAON journeyed to the Pacific sector of the Arctic Ocean to monitor bacterial variation in Arctic summer surface-waters, and temperature, salinity, fluorescence, and nutrient concentrations were determined during the ice-melting season. Among the measured physicochemical parameters, we observed a strong negative correlation between temperature and salinity, and consequently hypothesized that the melting ice decreased water salinity. The bacterial community compositions of 15 samples, includicng seawater, sea-ice, and melting pond water, were determined using a pyrosequencing approach and were categorized into three habitats: (1) surface seawater, (2) ice core, and (3) melting pond. Analysis of these samples indicated the presence of local bacterial communities; a deduction that was further corroborated by the discovery of seawater- and ice-specific bacterial phylotypes. In all samples, the Alphaproteobacteria, Flavobacteria, and Gammaproteobacteria taxa composed the majority of the bacterial communities. Among these, Alphaproteobacteria was the most abundant and present in all samples, and its variation differed among the habitats studied. Linear regression analysis suggested that changes in salinity could affect the relative proportion of Alphaproteobacteria in the surface water. In addition, the species-sorting model was applied to evaluate the population dynamics and environmental heterogeneity in the bacterial communities of surface mixed layer in the Arctic Ocean during sea-ice melting.
Korea Polar Research Institute, KIOST, Incheon, Republic of Korea ; School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea.
Dukki
D
Han
Division of Biology and Ocean Sciences, Inha University, Incheon, Republic of Korea.
Ilnam
I
Kang
Korea Polar Research Institute, KIOST, Incheon, Republic of Korea.
Ho Kyung
HK
Ha
Korea Polar Research Institute, KIOST, Incheon, Republic of Korea.
Hyun Cheol
HC
Kim
Korea Polar Research Institute, KIOST, Incheon, Republic of Korea.
Ok-Sun
OS
Kim
Korea Polar Research Institute, KIOST, Incheon, Republic of Korea.
Bang Yong
BY
Lee
Division of Biology and Ocean Sciences, Inha University, Incheon, Republic of Korea.
Jang-Cheon
JC
Cho
School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea.
Hor-Gil
HG
Hur
Korea Polar Research Institute, KIOST, Incheon, Republic of Korea.
Yoo Kyung
YK
Lee
D020561:Alphaproteobacteria / Q000145:classification / Q000235:genetics / Q000254:growth & development; D064751:Ammonium Compounds / Q000032:analysis; D001110:Arctic Regions; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000254:growth & development*; D017753:Ecosystem; D041965:Flavobacteriaceae / Q000145:classification / Q000254:growth & development; D005618:Fresh Water / Q000737:chemistry / Q000382:microbiology*; D020563:Gammaproteobacteria / Q000145:classification / Q000235:genetics / Q000254:growth & development; D005843:Geography; D046448:Ice Cover / Q000737:chemistry / Q000382:microbiology*; D016014:Linear Models; D009566:Nitrates / Q000032:analysis; D009585:Nitrogen Dioxide / Q000032:analysis; D009792:Oceans and Seas; D010710:Phosphates / Q000032:analysis; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D054712:Salinity; D012621:Seasons; D012623:Seawater / Q000737:chemistry / Q000382:microbiology*; D017422:Sequence Analysis, DNA; D012822:Silicon Dioxide / Q000032:analysis; D013696:Temperature
D064751:Ammonium Compounds; D009566:Nitrates; D010710:Phosphates; D012336:RNA, Ribosomal, 16S; D012822:Silicon Dioxide; D009585:Nitrogen Dioxide