TABLE 1.

Definitions of the different assembly processes, and respective model conditions referenced from Webb et al. (44), Stegen et al. (7, 34), and Zhou and Ning (12)

Process	Deterministic processes		Stochastic processes
Diversity	Alpha diversity
Clustering	Phylogenetic clustering	Phylogenetic overdispersion
Definition	Environmental conditions, selecting those species capable of survival and persistence in a local environment (environmental filtering)	Competitive exclusion, resulting in limiting similarity (overdispersion)
Phylogenetic structure index	NRI > 0	NRI < 0
Diversity	Beta diversity
Selection, Dispersal, Drift	Homogeneous selection	Heterogeneous selection	Dispersal limitation	Homogeneous dispersal	Drift
Definition	Consistent environmental factors cause a low compositional turnover	Shifts in environmental factors cause a high compositional turnover	Movement of an individual was restricted	High rate of movement of an individual from one location to another	Population size fluctuates due to chance events
Phylogenetic turnover index	βNRI < −2	βNRI > 2	−2 < βNRI < 2
Taxonomic turnover index	-	-	RCbray > 0.95	RCbray < −0.95	−0.95 < RCbray < 0.95