title: Soil-borne bacterial structure and diversity does not reflect community activity in Pampa biome.
abstract: The Pampa biome is considered one of the main hotspots of the world's biodiversity and it is estimated that half of its original vegetation was removed and converted to agricultural land and tree plantations. Although an increasing amount of knowledge is being assembled regarding the response of soil bacterial communities to land use change, to the associated plant community and to soil properties, our understanding about how these interactions affect the microbial community from the Brazilian Pampa is still poor and incomplete. In this study, we hypothesized that the same soil type from the same geographic region but under distinct land use present dissimilar soil bacterial communities. To test this hypothesis, we assessed the soil bacterial communities from four land-uses within the same soil type by 454-pyrosequencing of 16S rRNA gene and by soil microbial activity analyzes. We found that the same soil type under different land uses harbor similar (but not equal) bacterial communities and the differences were controlled by many microbial taxa. No differences regarding diversity and richness between natural areas and areas under anthropogenic disturbance were detected. However, the measures of microbial activity did not converge with the 16S rRNA data supporting the idea that the coupling between functioning and composition of bacterial communities is not necessarily correlated.
authors.affiliation: Departamento de Solos, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
authors.forename: Manoeli
authors.initials: M
authors.lastname: Lupatini
authors.forename: Afnan Khalil Ahmad
authors.initials: AK
authors.lastname: Suleiman
authors.forename: Rodrigo Josemar Seminoti
authors.initials: RJ
authors.lastname: Jacques
authors.forename: Zaida Inês
authors.initials: ZI
authors.lastname: Antoniolli
authors.forename: Eiko Eurya
authors.initials: EE
authors.lastname: Kuramae
authors.forename: Flávio Anastácio
authors.initials: FA
authors.lastname: de Oliveira Camargo
authors.forename: Luiz Fernando Würdig
authors.initials: LF
authors.lastname: Roesch
mesh_terms: D001419:Bacteria / Q000254:growth & development* / Q000378:metabolism; D001483:Base Sequence; D018533:Biomass; D001938:Brazil; D002245:Carbon Dioxide / Q000378:metabolism; D017753:Ecosystem; D025341:Principal Component Analysis; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology
chemical_list: D012987:Soil; D002245:Carbon Dioxide