Discussion
Identifying
the interactions between bacteria and microeukaryotes and the
combination of complex ecological communities is critical for the
management of biodiversity, especially in areas with strong human
interference and fragile ecosystems. OTUs belonging to keystone taxa are
nodes with the low betweenness centrality values and high degree, which
are very significant for maintaining the stability of the ecosystem (Ma
et al., 2016). Regarding microbial
communities, several hypotheses have been proposed, including ”neutral
theory” and ”niche theory” (Dumbrell, Nelson, Helgason, Dytham, &
Fitter, 2010). The Neutral theory predicts that community structure and
composition are relevant to the geographic distance between samples,
which is due to the dispersal restrictions, because many species have
equal functions in the ability to utilize niche. The niche theoretical
predicts that changes in species community composition are related to
variations in environmental parameters (Jongman, Ter Braak, & Van
Tongeren, 1995), because species have unique characteristics that enable
them to develop unique habitats that can be used. Here, we pointed out
the functional roles and environmental variables associated with
keystone species. By looking for related changes in the abundance of
natural taxa and ecosystem functions, we can infer which processes are
important.