Plant-pollinator interactions that have high conservation value (i.e. keystone interactions) within and between land-use types
We identified 19 distinct pollen-insect interactions (those that occurred more than 20 times), which were highly specialised to one particular land-use type (Table 2). Eleven of the total 19 pollen-insect pairs (five in cropping, four in dairy and two in forest) had PDI values significantly higher than those obtained from the null distribution (P < 0.05, Fig. S2, Table 2). Seven of these interactions involved fly species (Diptera), three involved bees or wasps (Hymenoptera) and one involved a beetle (Coleoptera). Pollen carried in these interactions was from six plant families, predominantly Asteraceae, Myrtaceae and Poaceae (Table 2). Grass pollen (Poaceae) was carried in eleven of the total specialised interactions by multiple insect orders (three Coleoptera families, six Diptera, one Hymenoptera and one Lepidoptera family, Table 2). Other wind-pollinated plant families (e.g. Cyperaceae) were also involved in highly specialised interactions with Chrysomelidae (Coleoptera).