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

Soares de Carvalho, Teotonio and Jesus, Ederson da Conceicao and Barlow, Bernard Josiah and Gardner, Toby Alan and Soares, Isaac Carvalho and Tiedje, James M. and Moreira, Fatima Maria de Souza (2016) Land use intensification in the humid tropics increased both alpha and beta diversity of soil bacteria. Ecology, 97 (10). pp. 2760-2771. ISSN 0012-9658

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Ecology
Additional Information:
Copyright by the Ecological Society of America, de Carvalho, T. S., Jesus, E. d. C., Barlow, J., Gardner, T. A., Soares, I. C., Tiedje, J. M. and Moreira, F. M. d. S. (2016), Land use intensification in the humid tropics increased both alpha and beta diversity of soil bacteria. Ecology, 97: 2760–2771. doi:10.1002/ecy.1513
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1105
Subjects:
ID Code:
82660
Deposited By:
Deposited On:
29 Nov 2016 11:20
Refereed?:
Yes
Published?:
Published
Last Modified:
02 Apr 2020 04:11