HR: 17:30h
AN: B14A-07    [Abstracts]
TI: Links between evolutionary history and soil microbial community structure revealed by DNA microarrays
AU: * Dubinsky, E A
EM: dubinsky@nature.berkeley.edu
AF: University of California, Department of Environmental Science, Policy and Management, Berkeley, CA 94720, United States
AU: Ackerly, D D
EM: dackerly@berkeley.edu
AF: University of California, Department of Integrative Biology, Berkeley, CA 94720, United States
AU: Brodie, E L
EM: elbrodie@lbl.gov
AF: Lawrence Berkeley National Laboratory, Ecology Department, Earth Sciences Division, Berkeley, CA 94720, United States
AU: Bird, J A
EM: jeffrey.bird@qc.cuny.edu
AF: Queens College, School of Earth and Environmental Sciences, Flushing, NY 11367, United States
AU: DeSantis, T Z
EM: tdesantis@lbl.gov
AF: Lawrence Berkeley National Laboratory, Ecology Department, Earth Sciences Division, Berkeley, CA 94720, United States
AU: Andersen, G L
EM: glandersen@lbl.gov
AF: Lawrence Berkeley National Laboratory, Ecology Department, Earth Sciences Division, Berkeley, CA 94720, United States
AU: Firestone, M K
EM: mkfstone@nature.berkeley.edu
AF: University of California, Department of Environmental Science, Policy and Management, Berkeley, CA 94720, United States
AU: Firestone, M K
EM: mkfstone@nature.berkeley.edu
AF: Lawrence Berkeley National Laboratory, Ecology Department, Earth Sciences Division, Berkeley, CA 94720, United States
AB: Soils harbor a vast diversity of uncultured microorganisms whose occurrence and habitat preferences across the Earth's surface are largely uncharted. We used phylogenetic DNA microarrays to make high-resolution assessments of microbial community structure and its relationship to environmental parameters in soils from different temperate and tropical ecosystems. Diverse communities (>2000 detected taxa) of soil bacteria were strongly structured in relation to single environmental predictors, particularly variables related to soil moisture. Bacteria within high-ranking taxonomic groups (up to the Phylum level) generally displayed coherent responses to changes in moisture, indicating that these responses have remained stable through evolutionary time. Drought-tolerant bacteria have evolved in remarkably few bacterial lineages, and consequently the variety of soil bacteria present in drier ecosystems is reduced compared to wet ecosystems like rainforests. From these results we predict that genomic diversity in soil is likely to decline where climate or land-use change increases drought conditions.
DE: 0410 Biodiversity
DE: 0439 Ecosystems, structure and dynamics (4815)
DE: 0444 Evolutionary geobiology
DE: 0465 Microbiology: ecology, physiology and genomics (4840)
DE: 0486 Soils/pedology (1865)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting