title: Conversion of the Amazon rainforest to agriculture results in biotic homogenization of soil bacterial communities.
abstract: The Amazon rainforest is the Earth's largest reservoir of plant and animal diversity, and it has been subjected to especially high rates of land use change, primarily to cattle pasture. This conversion has had a strongly negative effect on biological diversity, reducing the number of plant and animal species and homogenizing communities. We report here that microbial biodiversity also responds strongly to conversion of the Amazon rainforest, but in a manner different from plants and animals. Local taxonomic and phylogenetic diversity of soil bacteria increases after conversion, but communities become more similar across space. This homogenization is driven by the loss of forest soil bacteria with restricted ranges (endemics) and results in a net loss of diversity. This study shows homogenization of microbial communities in response to human activities. Given that soil microbes represent the majority of biodiversity in terrestrial ecosystems and are intimately involved in ecosystem functions, we argue that microbial biodiversity loss should be taken into account when assessing the impact of land use change in tropical forests.
authors.affiliation: Department of Biology, University of Texas, Arlington, TX 76019, USA.
authors.forename: Jorge L M
authors.initials: JL
authors.lastname: Rodrigues
authors.forename: Vivian H
authors.initials: VH
authors.lastname: Pellizari
authors.forename: Rebecca
authors.initials: R
authors.lastname: Mueller
authors.forename: Kyunghwa
authors.initials: K
authors.lastname: Baek
authors.forename: Ederson da C
authors.initials: Eda C
authors.lastname: Jesus
authors.forename: Fabiana S
authors.initials: FS
authors.lastname: Paula
authors.forename: Babur
authors.initials: B
authors.lastname: Mirza
authors.forename: George S
authors.initials: GS
authors.lastname: Hamaoui
authors.forename: Siu Mui
authors.initials: SM
authors.lastname: Tsai
authors.forename: Brigitte
authors.initials: B
authors.lastname: Feigl
authors.forename: James M
authors.initials: JM
authors.lastname: Tiedje
authors.forename: Brendan J M
authors.initials: BJ
authors.lastname: Bohannan
authors.forename: Klaus
authors.initials: K
authors.lastname: Nüsslein
mesh_terms: D000383:Agriculture; D000818:Animals; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D044822:Biodiversity; D001938:Brazil; D002417:Cattle; D017753:Ecosystem; D006801:Humans; D010802:Phylogeny; D011891:Rain; D012988:Soil Microbiology; D014197:Trees; D014329:Tropical Climate