Environmental filtering governs consistent vertical zonation in sedimentary microbial communities across disconnected mountain lakes.

Autor: Von Eggers JM; Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming, USA.; Program in Ecology and Evolution, University of Wyoming, Laramie, Wyoming, USA., Wisnoski NI; Wyoming Geographic Information Science Center, University of Wyoming, Laramie, Wyoming, USA.; Department of Biological Sciences, Mississippi State University, Mississippi State, Mississippi, USA., Calder JW; Department of Botany, University of Wyoming, Laramie, Wyoming, USA., Capo E; Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden., Groff DV; Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming, USA., Krist AC; Program in Ecology and Evolution, University of Wyoming, Laramie, Wyoming, USA.; Department of Zoology and Physiology, University of Wyoming, Laramie, Wyoming, USA., Shuman B; Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming, USA.; Program in Ecology and Evolution, University of Wyoming, Laramie, Wyoming, USA.
Jazyk: angličtina
Zdroj: Environmental microbiology [Environ Microbiol] 2024 Mar; Vol. 26 (3), pp. e16607.
DOI: 10.1111/1462-2920.16607
Abstrakt: Subsurface microorganisms make up the majority of Earth's microbial biomass, but ecological processes governing surface communities may not explain community patterns at depth because of burial. Depth constrains dispersal and energy availability, and when combined with geographic isolation across landscapes, may influence community assembly. We sequenced the 16S rRNA gene of bacteria and archaea from 48 sediment cores across 36 lakes in four disconnected mountain ranges in Wyoming, USA and used null models to infer assembly processes across depth, spatial isolation, and varying environments. Although we expected strong dispersal limitations across these isolated settings, community composition was primarily shaped by environmental selection. Communities consistently shifted from domination by organisms that degrade organic matter at the surface to methanogenic, low-energy adapted taxa in deeper zones. Stochastic processes-like dispersal limitation-contributed to differences among lakes, but because these effects weakened with depth, selection processes ultimately governed subsurface microbial biogeography.
(© 2024 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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