Fig. 6. The quantification of metacommunity diversity and ecological processes.

a hierarchical partitioning of the metacommunity diversity at multiscale. The ecosystem diversity (γ_Ecosystem) of each tank or across all tanks was partitioned into contributions of α_{Local-Communities} (mean diversity of each water or gut sample), β_{Intra-Habitats} (mean of diversity within water or gut habitats), and β_{Inter-Habitats} (sum of diversity between water and gut habitats). b the quantified major ecological processes governing the gut microbial communities. The percentages (numbers on the individual bars) are given the relative contribution of each known process to the community succession at different stages, and the remaining parts attributed to undominated process.