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Stoichiometry of soil enzyme activity at global scale.
A global-scale meta-analysis of the seven-most widely measured soil enzyme activities is conducted, indicating that the enzymatic potential for hydrolyzing the labile components of soil organic matter is tied to substrate availability, soil pH and the stoichiometry of microbial nutrient demand.
Do diet and taxonomy influence insect gut bacterial communities?
- D. Colman, E. Toolson, C. Takacs-Vesbach
- Biology, Environmental ScienceMolecular Ecology
- 1 October 2012
Evidence is found to support the hypotheses that host diet and taxonomy structure insect gut bacterial communities (P < 0.001) were important in hymenopteran and termite gut community structure, and diet was an important community structuring factor particularly for insect hosts that ingest lignocellulose‐derived substances.
Factors Controlling Soil Microbial Biomass and Bacterial Diversity and Community Composition in a Cold Desert Ecosystem: Role of Geographic Scale
The goals of the study were to describe the relationships between abiotic characteristics and soil bacteria in this unique, microbially dominated environment, and to test the scale dependence of these relationships in a low complexity ecosystem.
Molecular Characterization of the Diversity and Distribution of a Thermal Spring Microbial Community by Using rRNA and Metabolic Genes
The recent finding of citrate cleavage by enzymes other than ATP citrate lyase in the rTCA cycle of the Aquificaceae family supports the recent finding that Sulfurihydrogenibium and Thermocrinis may codominate some hydrothermal environments.
Thermal characterisation of active layer across a soil moisture gradient in the McMurdo Dry Valleys, Antarctica
Heat transport into active layer soils is important to understanding potential responses to changes in surface energy balance, particularly in the context of changing climate. Here we present results…
A comparison of methods for total community DNA preservation and extraction from various thermal environments
Comparing the quality, quantity, and diversity of environmental DNA samples preserved and extracted by commonly used methods found that the sucrose lysis buffer preserved samples extracted by the CTAB method were 15–43% more diverse than the other treatments.
Landscape Distribution of Microbial Activity in the McMurdo Dry Valleys: Linked Biotic Processes, Hydrology, and Geochemistry in a Cold Desert Ecosystem
- L. Zeglin, R. Sinsabaugh, J. Barrett, M. Gooseff, C. Takacs-Vesbach
- Environmental ScienceEcosystems
- 17 March 2009
In desert ecosystems, microbial activity and associated nutrient cycles are driven primarily by water availability and secondarily by nutrient availability. This is especially apparent in the…
Metagenome Sequence Analysis of Filamentous Microbial Communities Obtained from Geochemically Distinct Geothermal Channels Reveals Specialization of Three Aquificales Lineages
The distribution of Aquificales populations and differences among functional genes involved in energy generation and electron transport is consistent with the hypothesis that geochemical parameters have resulted in niche specialization among members of the Aquificalses.
Spatial variation in soil active-layer geochemistry across hydrologic margins in polar desert ecosystems
Abstract. Polar deserts are characterized by severe spatial-temporal limitations of liquid water. In soil active layers of the Antarctic Dry Valleys, liquid water is infrequently available over most…
Bacterial Community Structure Along Moisture Gradients in the Parafluvial Sediments of Two Ephemeral Desert Streams
- L. Zeglin, C. Dahm, J. Barrett, M. Gooseff, Shannon K. Fitpatrick, C. Takacs-Vesbach
- Environmental ScienceMicrobial Ecology
- 1 April 2011
Stream margins along gradients of wet to dry sediments are sampled, measuring geochemistry and bacterial 16S rRNA gene composition, to suggest that bacterial diversity and composition in desert stream sediments is more strongly affected by hydrology and conductivity than temperature.