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Fig. S1 Slope changes of reproductive traits on species richness or relative cover.

Fig. S2 Response of seed mass and seed viability to the removal treatment.

Table S1 The study sites and cushion plant species

Table S2 The datasets for the observational approach

Table S3 The datasets for the removal experiments

Table S4 Statistical results of the relationship between plant cover and cushion flower density for each site

Table S5 Statistical results of the relationship between plant cover and cushion fruit set for each site

Table S6 Statistical results of the relationship between plant cover and cushion fruit density for each site

Table S7 Statistical results of the relationship between plant cover and cushion seed set for each site

Table S8 Statistical results of the relationship between plant cover and cushion seed density for each site

Table S9 Statistical results of the experimental removal of cushion-associated species on cushion reproductive output

Table S10 Statistical results of the experimental removal of cushion-associated species on cushion reproductive output for each site

Notes S1 The relationship between biomass of cushion-associated plant assemblages and the reproductive output of cushions.

Notes S2 The relationship between the number of cushion-associated plant individuals and the reproductive output of cushion.