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Impact of methanotroph ecology on upland methane biogeochemistry in grassland soils

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dc.contributor.authorJudd, Craig R, author
dc.contributor.authorvon Fischer, Joseph C., advisor
dc.contributor.authorButters, Gregory, committee member
dc.contributor.authorWebb, Colleen T., committee member
dc.coverage.spatialNorth America
dc.coverage.spatialColorado
dc.coverage.spatialKansas
dc.coverage.spatialNew Mexico
dc.coverage.temporalTwentieth century
dc.coverage.temporal2000
dc.date.accessioned2007-01-03T05:15:42Z
dc.date.available2007-01-03T05:15:42Z
dc.date.issued2011
dc.description.abstractMolecular assays of soil environments reveal tremendous microbial diversity, but it remains unclear how this diversity might be mechanistically linked to the ecology of the organisms and their biogeochemical function. Methane consumption in upland soils is arguably the simplest biogeochemical function, and there are emerging patterns in the diversity and biogeography of the organisms that carry out soil methane consumption. This simplicity may allow methane uptake in upland soils to be a model system for merging microbial ecology, diversity and biogeochemistry. Five key traits appear critical for methanotroph ecology: enzyme kinetics, nutrient demand, pH tolerance, ammonium sensitivity and desiccation tolerance. Unfortunately, few studies to date have examined the functional consequences these traits may have on methane consumption. Here, I present analysis of methanotroph community composition and Michaelis-Menten kinetics of methane uptake across three North American temperate grassland sites of differing soil moisture regimes. Across this gradient, I observed distinct variation in community composition, and significant changes in enzyme kinetics. In addition, I find that differences in field estimates of methane activity parallel the patterns of Michaelis-Menten assays, which in turn correlate with differences in methanotroph community composition. These correlations suggest that methanotroph community composition alters ecosystem function.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierJudd_colostate_0053N_10443.pdf
dc.identifier.urihttp://hdl.handle.net/10217/47280
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectgrassland
dc.subjectmethanotroph
dc.subjectmethane
dc.titleImpact of methanotroph ecology on upland methane biogeochemistry in grassland soils
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineEcology
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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