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Postmortem microbial communities in burial soil layers of skeletonized humans.

Microorganisms are major ecological participants in the successional decomposition of vertebrates. The relative abundance, or the scarcity, of certain microbial taxa in gravesoil has the potential to determine the ecological status of skeletons. However, there are substantial knowledge gaps that warrant consideration in the context of the surrounding terrestrial ecosystem. In the current study, we hypothesized that i.) soil microbial diversity is disparate in the latter stage of decomposition (skeletonization) compared to the earlier stages (fresh, bloat, active and advanced decay), and ii.) the three layers of gravesoil (top, middle, and bottom) encompass similar microbial taxa and are analogous with control soil. To test these hypotheses, microbial communities in layers of burial soil of skeletonized bodies (treated) and from control soil, obtained from burial plots with no bodies (untreated), were compared using sequencing data of the 16S rRNA gene. The results demonstrated that Acidobacteria was confirmed as the most abundant microbial genus in all treated and untreated soil layers. Furthermore, Proteobacteria demonstrated a relatively low abundance in skeletonized gravesoil which is dissimilar from previous findings that assessed soil from earlier stages of human decomposition. Also, these results determined that soil microbial signatures were analogous in all three soil layers under the effects of similar abiotic and biotic factors, and they were similar to the communities in untreated soil. Therefore, the current study produced empirical data that give conclusive evidence of soil microbial successional changes, particularly for Proteobacteria, for potential use in forensic microbiology research.

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