Studies on diversity of bacterioplankton community and influencing environmental factors in the East China Sea
As an important component of the microbial loop,the bacterioplankton community plays important roles in the biogeochemical and energy cycles,dynamic and cross-kingdom algae-bacteria interactions and also the degradation of pollutants in water ecosystems.With the rapid development of coastal economy and the impact from human activities,the marine ecological environment is facing huge challenges,including serious degradation of ecosystems,eutrophication of water bodies,frequent ecological and environmental disasters,and aggravation of chemical pollution.Marine bacterioplanktons are key regulators of biogeochemical cycles,and elucidating their spatiotemporal change characteristics and mechanisms is crucial for revealing the ecological functions.To explore the distribution characteristics and influencing factors of the bacterioplankton community in different sea areas of the East China Sea,16S rRNA high-throughput sequencing was used to analyze the abundance differences of the bacterioplankton community of the selected 11 stations in the nearshore and offshore areas in the East China Sea in the winter of 2020,and the influencing effects of environmental factors on the distribution manner were also analyzed.The results showed that the species types of the bacterioplankton community in the nearshore in the investigated sea area mainly included Proteobacteria,Bacteroidetes,Actinobacteria and Firmicutes,and the two dominant genera(abundance＞5％)were Pseuidoalteromonas(22.33％)and Halomonas(5.09％),respectively.The bacterioplankton in the offshore area was mainly composed of Proteobacteria,Bacteroidetes and Actinobacteria,and the five dominant genera included Pseudoalteromonas(12.30％),Alcanivorax(9.98％),Vibrio(8.67％),Thalassomonas(6.09％)and Pseudomonas(5.73％,)respectively.The diversity index analysis showed that the abundance of bacterioplankton in the nearshore areas of the investigated sea area was significantly higher than that of the offshore areas.Offshore distance,seawater salinity and dissolved oxygen were the three main environmental factors affecting the diversity of bacterioplankton communities.Among biomarker species,Halomonas,Polaribacter,Krokinobacter and Fluviicola were positively correlated with offshore distance and salinity(P＜0.05),and negatively correlated with dissolved oxygen(P＜0.01).While Rhodovulum was negatively correlated with offshore distance(P＜0.05)and salinity(P＜0.01),but positively correlated with dissolved oxygen(P＜0.001).The results will provide help to further reveal the ecological functions of bacterioplankton community in the East China Sea.
East China Seabacterioplankton communitybacterial biodiversityenvironmental factors16S rRNA high-throughput sequencing
万方数据
维普
