Few studies have investigated bacterial community succession and the role of bacterial decomposition over a continuum of wood decay. Here, we identified how (i) the diversity and abundance of bacteria changed along a chronosequence of decay in Populus grandidentata (bigtooth aspen); (ii) bacterial community succession was dependent on the physical and chemical characteristics of the wood; (iii) interspecific bacterial interactions may mediate community structure. 459 taxa were identified through Illumina sequencing of 16S rRNA amplicons from samples taken along a continuum of decay, representing standing dead trees, downed wood, and soil. Community diversity increased as decomposition progressed, peaking in the most decomposed trees. While a small proportion of taxa displayed a significant pattern in regards to decay status of the host log, many bacterial taxa followed a stochastic distribution. Changes in the water availability and chemical composition of standing dead and downed trees and soil were strongly coupled with shifts in bacterial communities. Nitrogen was a major driver of succession and nitrogen-fixing taxa of the order Rhizobiales were abundant early in decomposition. Recently downed logs shared 65% of their bacterial abundance with the microbiomes of standing dead trees while only sharing 16% with soil. As decay proceeds, bacterial communities appear to respond less to shifting resource availability and more to interspecific bacterial interactions – we report an increase in both the proportion (+9.3%) and the intensity (+62.3%) of interspecific interactions in later stages of decomposition, suggesting the emergence of a more complex community structure as wood decay progresses.
|Journal||Frontiers in Microbiology|
|Early online date||2019|
|Publication status||Published - 2019|
- Microbial community ecology
- interspecific interaction
- wood decomposition
- wood microbiome
- 16S rRNA
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Wood characteristics determine bacterial assembly
Kuramae, E. (Creator), Fernandes Alves Leite, M. (Creator), Suleiman, A. (Creator), Gough, C. M. (Creator), Castillo, B. (Creator), Faller, L. (Creator), Franklin, R. (Creator) & Syring, J. (Creator), European Nucleotide Archive (ENA), 06 Jun 2019