Conversion of Amazon rainforest to agriculture alters community traits of methane-cycling organisms
- Univ. of Oregon, Eugene, OR (United States)
- Univ. of California, Davis, CA (United States)
- Univ. of Massachusetts, Amherst, MA (United States)
- USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
- Utah State Univ., Logan, UT (United States)
- Michigan State Univ., East Lansing, MI (United States)
Abstract Land use change is one of the greatest environmental impacts worldwide, especially to tropical forests. The Amazon rainforest has been subject to particularly high rates of land use change, primarily to cattle pasture. A commonly observed response to cattle pasture establishment in the Amazon is the conversion of soil from a methane sink in rainforest, to a methane source in pasture. However, it is not known how the microorganisms that mediate methane flux are altered by land use change. Here, we use the deepest metagenomic sequencing of Amazonian soil to date to investigate differences in methane‐cycling microorganisms and their traits across rainforest and cattle pasture soils. We found that methane‐cycling microorganisms responded to land use change, with the strongest responses exhibited by methane‐consuming, rather than methane‐producing, microorganisms. These responses included a reduction in the relative abundance of methanotrophs and a significant decrease in the abundance of genes encoding particulate methane monooxygenase. We also observed compositional changes to methanotroph and methanogen communities as well as changes to methanotroph life history strategies. Our observations suggest that methane‐cycling microorganisms are vulnerable to land use change, and this vulnerability may underlie the response of methane flux to land use change in Amazon soils.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- AC02-05CH11231; DE‐AC02‐05CH11231
- OSTI ID:
- 1379749
- Alternate ID(s):
- OSTI ID: 1401889
- Journal Information:
- Molecular Ecology, Vol. 26, Issue 6; ISSN 0962-1083
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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