Land use intensification in the humid tropics increased both alpha and beta diversity of soil bacteria

de Carvalho, Teotonio Soares; Jesus, Ederson da Conceição; Barlow, Jos; Gardner, Toby A.; Soares, Isaac Carvalho; Tiedje, James M.; Moreira, Fatima Maria de Souza

doi:10.1002/ecy.1513

Land use intensification in the humid tropics increased both alpha and beta diversity of soil bacteria

Journal Article · Sat Jul 02 00:00:00 EDT 2016 · Ecology

DOI:https://doi.org/10.1002/ecy.1513· OSTI ID:1533159

de Carvalho, Teotonio Soares ^[1]; Jesus, Ederson da Conceição ^[2]; Barlow, Jos ^[3]; Gardner, Toby A. ^[4]; Soares, Isaac Carvalho ^[5]; Tiedje, James M. ^[6]; Moreira, Fatima Maria de Souza ^[5]

Universidade Federal de Lavras (Brazil); Lancaster Univ., Bailrigg (United Kingdom); DOE/OSTI
Embrapa Agrobiologia (Brazil)
Lancaster Univ., Bailrigg (United Kingdom); Museu Paraense Emilio Goeldi, Avenida Magalhães Barata (Brazil)
Stockholm Environment Institute (Sweden)
Universidade Federal de Lavras (Brazil)
Michigan State Univ., East Lansing, MI (United States)

Anthropogenic pressures on tropical forests are rapidly intensifying, but our understanding of their implications for biological diversity is still very limited, especially with regard to soil biota, and in particular soil bacterial communities. Here we evaluated bacterial community composition and diversity across a gradient of land use intensity in the eastern Amazon from undisturbed primary forest, through primary forests varyingly disturbed by fire, regenerating secondary forest, pasture, and mechanized agriculture. Soil bacteria were assessed by paired-end Illumina sequencing of 16S rRNA gene fragments (V4 region). The resulting sequences were clustered into operational taxonomic units (OTU) at a 97% similarity threshold. Land use intensification increased the observed bacterial diversity (both OTU richness and community heterogeneity across space) and this effect was strongly associated with changes in soil pH. Moreover, land use intensification and subsequent changes in soil fertility, especially pH, altered the bacterial community composition, with pastures and areas of mechanized agriculture displaying the most contrasting communities in relation to undisturbed primary forest. Together, these results indicate that tropical forest conversion impacts soil bacteria not through loss of diversity, as previously thought, but mainly by imposing marked shifts on bacterial community composition, with unknown yet potentially important implications for ecological functions and services performed by these communities.

View Accepted Manuscript (DOE)

Research Organization:: Michigan State Univ., East Lansing, MI (United States); Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FC02-07ER64494; FG02-99ER62848

OSTI ID:: 1533159

Alternate ID(s):: OSTI ID: 1401219

Journal Information:: Ecology, Journal Name: Ecology Journal Issue: 10 Vol. 97; ISSN 0012-9658

Publisher:: Ecological Society of America (ESA)Copyright Statement

Country of Publication:: United States

Language:: English

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