3.3 Pollination efficiency
Overall, 242 pistils were analysed, 96 for Wollastonia biflora , 77 for Tridax procumbens, and 69 for Scaevola taccada . Only the interaction between local pollinator richness and plant species identity resulted significantly and positively associated with the number of pollen tubes counted on stigmas (χ32 = 40.37; p < 0.001), with different trends among the investigated species as highlighted in Fig 4. Specifically, pollination efficiency increased inWollastonia biflora ( βi= 0.19; p= 0.001),and Scaevola taccada ( βi= 0.19 ; p= 0.002), while it was constant in Tridax procumbens ( βi= -0.02; p= 0.7).
[Fig. 4]