Table 1.
The number of native and alien species (percentage), proportion of alien flowers (percentage) and floral traits similarity between native and alien plant species at each site is shown. Sites are ordered according to proportion of alien flower abundance.
Fig 1.
Box-plot for the (a) number of total flowers and (b) total visits registered in each study site. Sites are ordered according to increasing proportion of alien flower abundance (see Table 1).
Fig 2.
Box-plot for (a) Floral visitors’ richness; and (b) flower visitation rate per plot registered in each study site. Sites are ordered according to increasing proportion of alien flower abundance (see Table 1).
Fig 3.
Plant-pollinator networks in each of nine sites (a-i) along the north of the Yucatan Peninsula, Mexico. Nodes in blue and red represent native and alien plant species respectively. Nodes in yellow represent floral visitor species (see TS1 and TS2 for a complete list of plant and floral visitors and their codes). Numbers represent a scale for the number of interactions for a particular plant or floral visitor. Only codes for floral visitors with more than 100 visits are shown. Gray lines represent interactions between native plants and floral visitors, and red lines between alien plant species and floral visitors. Sites are ordered in increasing proportion of alien flower abundance (see Table 1).
Table 2.
Number of plants, floral visitor species and plant-floral visitor interaction network metrics at nine sites across the north coast of the Yucatan Peninsula.
Significant values for nestedness and modularity are shown in bold (P<0.05). Sites are ordered according to proportion of alien flower abundance (see Table 1).
Table 3.
Results of mixed models evaluating differences in species-level plant-pollinator network parameters.
Floral abundance (log number of flowers) was included as a covariate. Significant effects are shown in bold (p ≤0.01).
Fig 4.
Structural plant-floral visitor network parameters.
(a) Overall network specialization (H2), (b) nestedness and (c) robustness for the observed plant-floral visitor network (i.e. intact network) and the three extinction scenarios: “aliens removed”, “natives removed” and “random removal” (randomly exclusion of alien and natives). Different letters indicate statistical differences (p<0.05) between simulated extinction scenarios.
Table 4.
Mean (± SE) plant-floral visitor interaction network metrics and average rate of change (Δ %, according to Hedge´s size effects) under different extinction scenarios in nine sites along the north coast of Yucatan, Mexico.
Significant differences in the Δ % between “intact network” vs “aliens removed”; “intact networks” vs. “native removed”; and “intact networks” vs. “random removal” scenarios are shown in bold (p<0.05).