Deforestation of the Amazon rainforest reduces the stability of soil Archaea community

Leandro Nascimento Lemos, Andressa Monteiro Venturini, Lokeshwaran Manoharan, Alexandre Bagnoud, Melina Kerou, Fabiana da Silva Paula, Naissa Maria Silvestre Dias, Lucas William Mendes, Karoline Faust, Christa Schleper, Siu Mui Tsai

The Amazon rainforest is one of the most diverse biomes on Earth. However, land-use conversion from tropical forest to pasture are changing the globalbiogeochemical cycles and rainfall patterns. Here, we tested the hypothesis that deforestation alters the resistance to environmental perturbations of Archaea community in different soil moisture availability conditions. To test this hypothesis, we collected forest and pasture soil samples in the Amazon and conducted a 30-day laboratory incubation experiment with three moisture levels (soils at 60, 80 and 100% water holding capacities). We used Archaeal specific 16S rRNA amplicon sequencing, bioinformaticsand network models to monitor achaeal community changes and their relation to the soil properties. Analysis based on beta diversity indicated that Archaeal communities were mainly determined by their (land-use changes long-term perturbation) and then by their moisture levels(short-term perturbation) . The three most abundant Archaeal phyla were Thaumarchaeota, Euryarchaeota, and Bathyarchaeota. The potentially methanogenic phyla Bathyarchaeota and Euryarchaeota showed an increase in their relative abundances in pasture soils and were correlated with the increase of methane emissions. Our results indicate that the Archaeal community alterations caused by higher moisture levels were more intensified in the pasture than in the forest, probably reducing the resistance of the Archaea community.

Externe Organisation(en)
Universidade Federal de São Paulo (UFSJ), Vrije Universiteit Brussel
ÖFOS 2012
106022 Mikrobiologie
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