title: Distribution and interaction patterns of bacterial communities in an ornithogenic soil of Seymour Island, Antarctica.
abstract: Next-generation, culture-independent sequencing offers an excellent opportunity to examine network interactions among different microbial species. In this study, soil bacterial communities from a penguin rookery site at Seymour Island were analyzed for abundance, structure, diversity, and interaction networks to identify interaction patterns among the various taxa at three soil depths. The analysis revealed the presence of eight phyla distributed in different proportions among the surface layer (0-8 cm), middle layer (20-25 cm), and bottom (35-40 cm). The bottom layer presented the highest values of bacterial richness, diversity, and evenness when compared to surface and middle layers. The network analysis revealed the existence of a unique pattern of interactions in which the soil microbial network formed a clustered topology, rather than a modular structure as is usually found in biological communities. In addition, specific taxa were identified as important players in microbial community structure. Furthermore, simulation analyses indicated that the loss of potential keystone groups of microorganisms might alter the patterns of interactions within the microbial community. These findings provide new insights for assessing the consequences of environmental disturbances at the whole-community level in Antarctica.
authors.affiliation: Universidade Federal do Pampa, Campus São Gabriel, Av. Antonio Trilha, 1847, 97300-000, São Gabriel, Rio Grande do Sul, Brazil.
authors.forename: Pabulo Henrique
authors.initials: PH
authors.lastname: Rampelotto
authors.forename: Anthony Diego Muller
authors.initials: AD
authors.lastname: Barboza
authors.forename: Antônio Batista
authors.initials: AB
authors.lastname: Pereira
authors.forename: Eric W
authors.initials: EW
authors.lastname: Triplett
authors.forename: Carlos Ernesto G R
authors.initials: CE
authors.lastname: Schaefer
authors.forename: Flávio Anastácio
authors.initials: FA
authors.lastname: de Oliveira Camargo
authors.forename: Luiz Fernando Wurdig
authors.initials: LF
authors.lastname: Roesch
mesh_terms: D000864:Antarctic Regions; D001419:Bacteria / Q000235:genetics / Q000378:metabolism*; D004269:DNA, Bacterial / Q000235:genetics / Q000378:metabolism; D062312:Islands; D064307:Microbiota; D008969:Molecular Sequence Data; D012336:RNA, Ribosomal, 16S / Q000235:genetics / Q000378:metabolism; D012988:Soil Microbiology
chemical_list: D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S