Premium
Common bacterial responses in six ecosystems exposed to 10 years of elevated atmospheric carbon dioxide
Author(s) -
Dunbar John,
Eichorst Stephanie A.,
GallegosGraves La Verne,
Silva Shan,
Xie Gary,
Hengartner N. W.,
Evans R. David,
Hungate Bruce A.,
Jackson Robert B.,
Megonigal J. Patrick,
Schadt Christopher W.,
Vilgalys Rytas,
Zak Donald R.,
Kuske Cheryl R.
Publication year - 2012
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/j.1462-2920.2011.02695.x
Subject(s) - acidobacteria , ecosystem , biology , ecology , terrestrial ecosystem , relative species abundance , library , abundance (ecology) , 16s ribosomal rna , bacteria , proteobacteria , genetics
Summary Six terrestrial ecosystems in the USA were exposed to elevated atmospheric CO 2 in single or multifactorial experiments for more than a decade to assess potential impacts. We retrospectively assessed soil bacterial community responses in all six‐field experiments and found ecosystem‐specific and common patterns of soil bacterial community response to elevated CO 2 . Soil bacterial composition differed greatly across the six ecosystems. No common effect of elevated atmospheric CO 2 on bacterial biomass, richness and community composition across all of the ecosystems was identified, although significant responses were detected in individual ecosystems. The most striking common trend across the sites was a decrease of up to 3.5‐fold in the relative abundance of Acidobacteria Group 1 bacteria in soils exposed to elevated CO 2 or other climate factors. The Acidobacteria Group 1 response observed in exploratory 16S rRNA gene clone library surveys was validated in one ecosystem by 100‐fold deeper sequencing and semi‐quantitative PCR assays. Collectively, the 16S rRNA gene sequencing approach revealed influences of elevated CO 2 on multiple ecosystems. Although few common trends across the ecosystems were detected in the small surveys, the trends may be harbingers of more substantive changes in less abundant, more sensitive taxa that can only be detected by deeper surveys.