南极深海鲑肠道微生物群落多样性分析OA

To investigate the diversity of gut microorganisms in Antarctic fishes and the mechanism of adaptation to the Antarctic environment,a total of 10 Bathylagus antarcticus were caught by midwater trawl in the Astronaut Sea and the Gulf of Prydz.The diversity of gut microorganisms of Bathylagus antarcticus was analyzed based on 16S rRNA sequencing.A total of 401 OTUs were obtained by sequencing,with a low α-diversity index.PERMANOVA results showed that there was no significant difference(P>0.05)between the gut microbial communities of Bathylagus antarcticus in different seas.Proteobacteria(83.19％),Tenericutes(9.23％)and Firmicutes(4.51％)were the main phyla in the gut microbial community of Bathylagus antarcticus.Among them,Acinetobacter(44.48％),Mycoplasma(9.20％),Photobacterium(11.31％)and Pseudoalteromonas(4.05％)were the dominant genera in the gut microorganisms of Bathylagus antarcticus.Cluster analysis showed that the samples differed significantly at the genus level,and this variability was due to random selection by host and environmental factors.The study reveals the effects of the extreme Antarctic environment on the gut microorganisms of fish,which can provide references for the feeding ecology of Bathylagus antarcticus as well as the subsequent development of resources.