Formation and sustenance mechanism of bacterial diversity in nutrient-deficient environment of indoor stadium

Abstract

Bacterial diversity has been found in indoor stadiums which can be considered as a specific nutrient-deficient environment (NDE), it remains a mystery and opens to new ideas why the bacterial diversity can be formed and maintained in NDE of indoor stadiums, since it is obvious to violate the famous competitive exclusion principle (CEP) in ecology. In the article, five most common genera, Pseudomonas, Acinetobacter, Exiguobacterium, Sphingobacterium, Chryseobacterium in indoor stadiums were selected and periodically sampled to supervise the dynamic characteristics of bacterial community. Based on quorum sensing (QS) and non-monotonic interspecific interaction (NMII) in combination with microbial ecology, clustering analysis and experimental observation, a new hypothesis was put forward to elucidate QS with NMII of substrate location information (SLI) mechanism driving bacterial community succession with high diversity in NDE of indoor stadium. A valid cellular automation (CA) model was derived from assumptions directly, and the CA simulation sufficiently proved that as a cell conducted either intraspecific and interspecific competition without SLI broadcasting and intraspecific and interspecific cooperation with SLI broadcasting, which were totally dependent on the number and type of cells occupying on its eight nearest neighboring grids, and could effectively weaken interspecific competition to form and sustain the bacterial diversity during bacterial community succession in NDE of indoor stadium. The CA simulation results proved that the proposed hypothesis can shed light on the underlying succession mechanism of bacterial community in NDE, and adequately explain observed phenomena and data. The finding of study offered a new insight on how bacterial diversity was formed and sustained in NDE of indoor stadium, and the succession mechanism confirmed by CA simulation can set up a theoretical framework for comprehensive apprehension about ecological effect of QS with NMII of SLI sharing on formation and sustenance of bacterial diversity in NDE of indoor stadium.